UNIVERSIDAD DE GRANADA
Departamento de Estratigrafía y Paleontología
Facultad de Ciencias
Artículo publicado con motivo del International Symposium Epicontinental Triassic (Halle, Alemania):
Zentralblatt für Geologie und Paläontologie. Teil
I, Jahrgang 1998, Heft 9-10, 1009-1031. EPICONTINENTAL TRIASSIC. G.H.
Triassic of the Southern Iberian Continental Margin (Betic
Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Universidad de Granada, 18071-Granada, Spain.
This paper presents the geology of the epicontinental Triassic within the Southern Iberian Continental Margin (Betic Cordillera). Emphasis is placed on those problems posed by the study of the Betic Cordillera Triassic. The characteristics of the epicontinental Triassic and its tectonic setting are described.
In Triassic outcrops folds and nappes are quite frecuent. In many cases Triassic rocks are part of an olistostromic complex developed during the orogeny in the Miocene over the entire cordillera.
Two carbonate formations have been distinguished: an Anisian-Carnian Muschelkalk facies (Majanillos Formation), which is composed of limestones, and especially marls in the upper part; and another of Norian age (Zamoranos Formation), composed of bedded dolomites and a red detrital member, with volcanic rock debris, which is intercalated in the lower dolomites. The Keuper is represented by five units which are of Carnian-Norian age. The lower unit displays alternations of shales, gypsum, dolomites and sandstones. The two intermediate units consist of sands and shales, respectively, whereas in the two upper units there is a predominance of gypsums.
Finally, several considerations are made regarding the sequence stratigraphy and, specifically, the transgressive cycles corresponding to the Majanillos Formation and to the Zamoranos Formation, which is the most expansive unit.
Triassic deposits constitute the beginning of the alpine sedimentation cycle inmuch of the Iberian Penisula. The three lithostratigraphic units equivalent to the Germanic Triassic Groups can be identified in almost all of the Triassic basins: Buntsandstein, Muschelkalk and Keuper. However, each basin displays variations in lithofacies and biofacies which are sufficiently significant to make different palaeogeographical units distinguishable (Sopeña et. al. 1985; Virgili et al. 1977; Sopeña et al. 1988).
Betic Cordillera (Southern Iberian Peninsula) there are many epicontinental
Triassic outcrops (Fig. 1) with facies that
are similar to the those described in other regions of the
1.1 Tectonic characteristics of the Betic Cordillera
terms of geography, the Betic Cordillera is the range of mountains occupying
the Southern Iberian Peninsula from
The cordillera is formed by two large geological zones: External Zones and Internal Zones. The External Zones (according to the definition given by Auboin 1965) consist of a basement which is not visible at the surface, and a cover of Mesozoic and Tertiary deposits in the Southern Iberian Paleomargin. The oldest rocks of the cover are Triassic, since the Paleozoic rocks belong to the basement. The structure of the cover is due to a detachment tectonics which gives way to folds and overthrust folds (e.g. Azema et al. 1979; García Hernández et al. 1980). The Internal Zones consisting of basement and cover rocks, which in many cases are metamorphic, are structured in large nappes. During the Mesozoic, these rocks constituted a more southern domain independent from the Southern Iberian Paleomargin (e.g. Durand Delga and Fontboté 1980; Comas and García Dueñas 1988).
addition to these two large geological zones it is important to consider the
Depression of the
During the alpine orogeny the deposits constituting the meridional margin of the Iberian Plate, and which now constitute the cover of the External Zones, evolved from the tectonic point of view in a way analogous to that of other alpine margins (Fig. 4; Vera 1988). This margin was structured in various palaeogeographical domains which now constitute two main tectonic zones spanning in an ENE direction: the Subbetic Zone and the Prebetic Zone. The Prebetic, palaeographically nearer to the Hercynian massif, displays mainly marine sediments more shallow than the Subbetic, or even continental sediments. Between the Subbetic and the Prebetic a domain of mixed stratigraphic characteristics can be distinguished, as well as an intermediate position between both, which constitutes the so-called "Intermediate Domain".
1.2 Triassic lithotypes
Three main types of Triassic deposits can be distinguished in the Betic Cordillera (Fig. 1.B): alpine, continental (redbeds) and epicontinental Triassic.
In the Internal Zones there are carbonate alpine facies, which can be recognised above all in the Alpujárride Complex; the Continental Triassic consists of detrital facies (Verrucano type) which appears in the Maláguide Complex (e.g. Azema et al. 1979).
epicontinental Triassic outcrops primarily in the External Zones over more
On the other hand, on the south side of the Meseta, another Triassic outcrop can be seen displaying continental facies (redbeds), which have been called "Hespérico" (Virgili et al. 1977), "Mesético" (Busnardo 1975) or the Chiclana de Segura Formation (López Garrido and Rodríguez Estrella 1970).
In this paper an overview will be given of those epicontinental Triassic facies which outcrop in the External Zones, especially in the Subbetic Zone, and of the problems which have been posed on the basis of the data published in recent years. It should be kept in mind that many of these questions remain open to new interpretations and that a number of difficulties have yet to be resolved.
Epicontinental Triassic deposits constitute in general the main detachment level of the tectonic units formed during the alpine orogeny as a result of their tectonic position (Fig. 2), their plastic characteristics (shales and evaporites) and their substantial thickness ( García Dueñas 1969; Sanz de Galdeano 1973; Azema et al. 1979; Rivas et al. 1979).
Furthermore, in the Jurassic and the Cretaceous, during the stage of the most important rifting, the Triassic rocks were expanding, breaking and becoming thinner while Jurassic and Cretaceous sediments were depositing (Fig. 2.3, 2.4). These Triassic rocks were being displaced by means of tectonic and diapiric mecanisms, thus being redeposited in certain cases on the Cretaceous basin. Therefore, before the important orogenic movements were produced in the Miocene, the Triassic deposits had already been mobilised and, in some cases, deformed and redeposited.
As a result of these mecanisms, Triassic outcropping occurs in a notably displaced and fractured manner, and displays a mixture of different tectonic units (Fig. 2.5). This is what renders difficult the study of its stratigraphy, as well as the characterisation of the various palaeogeographical units.
Betic epicontinental Triassic the differentiation of the three large groups
of lithological units (Buntsandstein, Muschelkalk and Keuper) had already
been established by the end of the last century (for instance Bertrand and
Kilian 1889). Several peculiar differences were observed regarding the
Triassic in the
Recently, Pérez-López (1991) and Pérez-López et al. (1992) have distinguished in the central area of the External Zones (Fig. 3) a carbonate formation of Muschelkalk facies (Majanillos Formation), five detrital evaporitic formations, which constitute the Jaen Keuper Group, and finally, one upper carbonate formation of Norian age (Zamoranos Formation). The presence of the Bundsandstein (Anisian) in the Subbetic domain is still being debated and the evaporites of the Rhaetian are difficult to recognize.
All of these formations display significant variations in their lithofacies and thickness, depending on which palaeogeographical unit is concerned (Martín Algarra 1987; Martín Algarra et al. 1995).
unit displays outcrops in very few places. It has been definitively identified
only below the Muschelkalk in the northernmost sector of the basin (External
Prebetic), near the Meseta, and in several places in the
The Muschelkalk deposits consist of a carbonate succession generally dominated by marlstones towards the upper part (Fig. 3). They display an overall thining-upward trend.
main members can be distinguished in the Majanillos Formation in the Subbetic
Zone: a lower one (Member 1), 20-40m thick, consisting of thick limestone and
dolomite beds, with intervals of approximately 10m of thin-bedded marly
limestone; and a higher member (Member 2), up to
The lower member has been interpreted in general as a deepening sequence in which subtidal and ramp deposits can be identified (Pérez-López 1998). The middle member presents a predominance of marly facies deposited on a shallow platform on which there are frecuent storm deposits. The facies belonging to the higher member display lagoon and tidal flat deposits which correspond to a muddy shallowing-upward sequence.
Keuper is characterised by multicoloured and red shales, sandstones, gypsum
and sometimes by basic intrusive. Although none of the outcrops display a
complete section of Keuper, five different lithostratigraphic units have been
distinguished in Subbetic Zone (Jaén Keuper Group). The thicknesses and
facies of these units vary from the Internal Subbetic to the Prebetic Zone.
The units can be correlated with the formations that outcrop in the
Unit K1 (100-
Consists of multicoloured shales with thin intercalations of carbonates, gypsum and fine-grained sandstones. Local lignites also appear. The sandstones present parallel and cross-lamination. Ripples on the top of some layers are also frequent, and in some cases erosive surfaces, plant debris (especially conifers) and mud pebbles can be observed.
Associated with the sediments of this unit, there are apparently halite deposits, which, though they do not outcrop, can be inferred from the many saline gullies which drain these materials. The marine origin of these salts and sulphates is known to exist in various Spanish basins (Ortí and Pueyo 1983; Ortí 1987; Utrilla et al. 1987; Ortí 1990; Ortí et al. 1994).
The facies of this unit can be attributed to a fluvial-coastal systems tract, with ample development of lakes and salt pans (Pérez-López and López Chicano 1989).
This formation is characterised by a predominance of thick sandstone beds with interbedded claystones. The sandstone beds show trough and planar cross stratification and contain one or several erosive surfaces. Other facies, commonly in the middle and upper part of this unit, are those with parallel-laminated sandstones and low-angle cross-bedded sandtones, which sometimes display deformed cross-lamination or small-scale current structures (ripples). Plant debris and mud pebbles are frecuent in some layers.
These deposits are channel infill from an extensive fluvial system having wide and shallow watercourses with the development of large expanses of sand bars. Also important are the deposits related to the high-flow regime (sheet floods), which developed over broad areas and are characteristic of ephemeral floods (e.g. McKee et al. 1967; Tunbridge 1981, 1984). This unit corresponds to the deposits of a terminal alluvial system (Pérez-López 1991).
Unit K3 (50-
In this unit two members have been distinguished: a clay member and a sand member. In the clay member a predominance of red claystone with red nodular gypsum can be observed. There is also a number of thin beds consisting of greenish and red sanstone.
sand member is less thick (1-
The deposits of this unit, essentially claystones with gypsums and some dolomites, are interpreted as a saline mud flat with environments of sabkha and lagoonal deposits.
The sandstones, which have a greater proportion of clay and display ripples, suggest a relationship between the mud flat and a sand flat with distal facies, that correspond to the terminal-fan deposits.
Unit K4 (5-
This unit presents sections of less thickness in the Subbetic Zone, although it is well represented in the Prebetic Zone. It consists of clay with a large percentage of red nodular gypsum, although laminated gypsum can be found locally. The abundance of nodular gypsums and red clay permits this unit to be interpreted as sabkha deposits of a coastal plain.
2.3.5 Unit K5 (50-70m)
unit consists of stratiform masses of white and grey laminar gypsums. In the
higher part of the unit there are dolomites which can reach
This unit is similar in facies to the evaporitic deposits of the Upper Evaporitic Series of Keuper facies (Ortí 1974), in which halite deposits have also been found in subsurface sections and certain outcrops (Ortí and Pérez-López 1994).
The evaporites, claystones and dolomites of this unit correspond to the deposits which are situated on the coast, in relation to marshes, salt pans or saline lagoons where the precipitation of the evaporites or carbonates took place. This implies extremely restricted coastal or marine facies.
2.4 Upper Carbonate Unit
This unit has been recognised from the Prebetic Zone to the Internal Subbetic Zone, though with variable thickness and different facies. It corresponds to the upper carbonate formation of the Triassic, the so-called Zamoramos Formation in the Subbetic Zone (Pérez-López et al. 1992).
Subbetic outcrops of this carbonate Formation are decametric blocks, which are limited by tectonic contacts and float on shales. For this reason, these carbonates have been confused on previous occasions with Muschelkalk carbonates due to the fact that they had never been dated and their stratigraphic situation was difficult. This Formation outcrops in its stratigraphic position above the K5 unit exclusively in some outcrops of the Eastern External Prebetic (Pérez-López et al. 1996).
consists of bedded limestones and dolomites (25-
The detrital deposits consist of red shales, sandstones, volcanic rock debris and high concentrations of iron oxides (Hematite). This red intercalation is interpreted as coastal-continental complex deposits: fluvial, mud flat and lake deposits with pedogenic processes.
2.5 Carcelen Anhidrite (Triassic-Liassic transition)
The Carcelen Anhidrite (Ortí 1987) is situated above the carbonates of the Zamoranos Formation (Fig. 3). It is an evaporitic unit which presents gypsums, carbonates and shales in its outcrops. In the subsoil, however, this unit is formed by anhidrite, shales, and dolomite beds with important intercalations of halite. This unit outcrops in several places of the central part of the Subbetic Zone and in the Eastern External Prebetic Zone, although it is very difficut to recognize because some of its facies are like K5 Unit facies.
It possesses a substantial development in the subsoil, as has already been observed in the eastern sector of the Betic Cordillera and, especially, in other adjacent basins such as the region of Valencia-Cuenca (Ortí 1990).
This unit is interpreted as deposits in a palaeogeographical location similar to that of the K5 unit which are related to lagoonal environments and coastal sabkhas.
When the Triassic is studied on the basis of the large number of outcrops which together compose, as it were, a kind of "puzzle", there is a scarcity of fossils that make age determination of the various lithostratigraphic units possible. This introduces difficulties regarding the correlation of units and the study of Triassic stratigraphy with the required exactitude or completeness.
In general, the record is quite poor and the degree of preservation of the fossils is frecuently deficient (Márquez-Aliaga 1985). Nevertheless, in spite of the fact that many areas have not been sampled, or properly studied, new age determinations have permitted in recent years a better understanding of Triassic stratigraphy.
The coastal-continental deposits (shales, sands and evaporites) present plant debris (Equisetites arenaceus) and Carnian pollen (Camerosporites secatus, Patinaporites densus and Vallasporites ignacii) in the K1 and K3 units. On the other hand, it is interpreted that the Unit K5 may be Norian due to its stratigraphic position.
In the upper carbonate unit (Zamoranos Formation), situated above the K5 unit, Norian pollen has been found. Finally, have been dated as Rhaetian some Carcelen Anhidrite shales.
A fossil record, therefore, exists from the Anisian to the Rhaetian, although it is not a very precise one. No datings appear to have been done of the Anisian in coastal-continental deposits that can be attrituted to the Buntsandstein or Middle Muschelkalk. Furthermore, in a number of shale outcrops situated below Muschelkalk carbonates Carnian pollen has been found. This suggests that the shales in many cases occupy a non-stratigraphic position below a carbonate tectonic unit, thus corresponding to the Keuper.
4. Sequence Stratigraphy
and Villena (1977) establish a sequence stratigraphy for the Triassic of the
Iberian Penisula. However, the boundaries of certain sequences are difficult
to establish for certain Triassic basins on the
A sequence stratigraphy can be established for the epicontinental Triassic in the Betic Cordillera, although not without certain difficulties which are due to the fact that the starting point is a stratigraphy reconstructed on the basis of incomplete sections. In the stratigraphic succession visual lacunae and faults exist whose importance is not easy to estimate. A preliminary interpretation has been made regarding several of the boundaries of the possible depositional sequences (Pérez-López and Fernández 1992).
In this paper we have described the most important discontinuities, and also those parasequence associations with a specific polarity in facies evolution (Fig. 3). These associations correspond to cyclostratigraphic units (García et al. 1989).
In general, in the entire Triassic succession numerous surfaces can be observed to have characteristics which can be related with discontinuities. Problems arise in attempts to quantify or assess the importance of these discontinuities that offer so few biostratigraphic data. Until now what has been attempted is the recognition of the possible boundaries of depositional sequences and, as a result of such recognition, four significant discontinuities have been identified.
4.1.1 DM1 and DM2 in the Muschelkalk
In the Majanillos Formation a number of discontinuities and paraconformities can be observed, normally corresponding to accumulation of shells and iron oxides, and sometimes to erosive surfaces. However, only two of these discontinuities are important, namely the ones that are the cyclostratigraphic boundaries which are related to sea level changes. The first (DM1) corresponds to a hardground with ceratites, where the Anian-Ladinian boundary is situated. The second (DM2), which is difficult to recognize, is located on a surface which displays abundant iron oxides with a high concentration of brachiopods and bivalves. This second discontinuity is the basal boundary of a marly section which passes upwards into Keuper shales.
4.1.2 DK2 in the Keuper
Jaen Keuper Group many discontinuities and/or diastems can be observed in
association with erosive surfaces, calcretes and surfaces rich in iron oxide.
One of these surfaces is recognised as a regional sedimentary break it is
located at the base of the
4.1.3 DZ1 in the Zamoranos Formation
As has already been said, the carbonate Zamoranos Formation is characterised by the intercalation of red detrital deposits. The lower boundary of these deposits corresponds to a more or less developed karstic surface, situated on the top of the lower carbonates. This surface has been interpreted as a discontinuity (DZ1) which separates continental upper deposits from marine lower deposits.
4.2 Cyclostratigraphic units
Four cyclostratigraphic units have been identified on the basis of the main discontinuities, in comparison with the sequence stratigraphy established in other basins on the Penisula, and according to facies evolution.
1. Cyclostratigraphic unit B-M. The lower boundary of this unit never becomes visible either because it always corresponds to a tectonic contact or because the section is incomplete. Its upper boundary is the DM1 discontinuity. This sequence comprises an evolution from coastal-plain facies to the distal facies of a carbonate ramp (deepening-upward sequence).
2. Cyclostratigraphic unit M. Its lower and upper boundaries are, respectively, the DM1 and DM2 discontinuities. In this cyclostratigraphic unit, a shallow-deep facies alternation can be observed, which corresponds to an association of parasequence with vertical aggradation.
3. Cyclostratigraphic unit M-K1. This unit comprises the final member of the Majanillos formation and the first unit of the Jaen Keuper Group (Unit K1). The lower boundary corresponds to the DM2 discontinuity and the upper boundary to the DK2 discontinuity. In this unit a progradation of the sedimentary environments has been interpreted. In the lower part there are very shallow marine carbonates. Afterwards, there is a progressive increase in shales and coastal gypsums, and a predominance of fluvial sandstones in the upper part.
Cyclostratigraphic unit K2-Z. The boundaries of this unit are the DK2 and DZ1
discontinuities. The sequence comprises units
Correlation between the depostional sequences and the third order cycles (Haq et al. 1987) has been attempted, although with certain reservations, and as a possibility open to new interpretations (Pérez-López and Fernández 1992; Pérez-López 1996). It is also very probable that comparisons cannot be made with all of the global eustatic cycle boundaries due to the significant effect of the tectonic control over Triassic deposits.
correlations with other regions appear to be of greaterinterest,
but in this case in terms of parasequence associations or of
transgressive/regressive cycles. It can thus be observed that over most of
This carbonate unit corresponds to a transgressive cycle which in the Betic Cordillera starts in the Anisian and continues until reaching the Carnian, which is where the carbonate deposits of Muschelkalk facies occupy the maximum area. In the thicker stratigraphic sections after the trangressive stage, there is an aggradation interval which is followed by a regressive stage.
second transgressive cycle, related to marine deposits, is even more
extensive, even shorter in terms of time and, therefore, faster. The
carbonate deposits corresponding to this transgression occupy a greater area
in the Betic Cordillera and coincide with those of an identical age in most
it can be observed that the thicknesses of the sequences are, roughly,
inversely proportional to the number of years they involve. The rate of
sedimentation of the detrital materials ranges from 5-
5. Triassic rocks and tectonics
The various Triassic lithological units of the Betic Cordillera External Zones have reacted differently to tectonic transport in accordance with their lithology and their position in the stratigraphic succession.
carbonate competent beds of the Muschelkalk generally overlie the Keuper
clays, which in turn may sit on top of other Keuper formations. The
5.1 Diapiric movements and resedimentation
Starting from the Cretaceous, and even from the Upper Jurassic, Triassic rocks develop alocinetic phenomena and diapirism, and can extrude shales and evapotrites on the sea bed (e.g. Blumenthal 1931; Fallot 1944; Peyre 1960-62; Dupuy de Lome 1965; Foucault 1966, 1971; Sanz de Galdeano 1973; Comas 1978). In fact, in a number of Subbetic Zone sectors there are intraformational breccias and slumps around the diapiric nuclei. These show some alocinetic phenomena that affect Jurassic and Cretaceous deposits (Sanz de Galdeano 1973; Nieto et al. 1992). Even Triassic, as well as Jurassic rocks, can be seen resedimented during the Neocomian (Sanz de Galdeano 1973).
At numerous points there are also some Triassic masses situated between the Middle and Upper Cretaceous (Leclerc 1971; Foucault 1966, 1971; Cruz-Sanjulian 1974, 1976; Comas 1978). There are Triassic deposits as well, which are resedimented in Upper Cretaceous materials in Subbetic units (Sanz de Galdeano 1973).
The main diapiric extrusion and the formation of olistostromic units took place mostly during the main stage of deformations in the External Zones, which began in the Burdigalian (Hermes 1985; Sanz de Galeano and Vera 1992). Especially over important areas of fractures, and locally through old diapiric nuclei, the exit was caused by the push and disorganization which the Subbetic Zone underwent (moving W or NW) due to the advance of the Internal Zones (Sanz de Galdeano 1990). The latest development of the olistostromic units, involving important resedimentation processes (e.g. Mauthe 1970; Bourgois 1975), was produced in the Langhian-Serravallian (Roldán García 1988; Roldán García and García Cortés 1988), and up to the base of the Tortonian.
continuity or extension of the External Zone tectonic units diminishes
All of these data have contributed to the proposal of a model in which the epicontinental Triassic units form an olistostromic complex that can be studied on various scales (Fig. 5). The change is gradual from shale olistostromic masses which contain pebbles and small blocks, to the large Triassic masses which include subbetic materials formed mainly by Jurassic and Cretaceous deposits. Some of these subbetic materials are small blocks, but there are others which have a continuity of dozens of kilometres, and which constitute authentic tectonic units with their own internal structure (nappes). On the regional scale, the entire northern sector of the Subbetic Zone, including the Intermediate and certain Prebetic units, appear as a large olistostromic complex which we have called the Subbetic Olistostromic Complex (Pérez-López and Sanz de Galdeano 1994). In this complex, the Triassic shales are frequently the matrix of the Miocene olistostrome, although they are sometimes simply Triassic olistolith.
This olistostrome of the central sector of the Subbetic Zone is even more developed in the western part, where the Jurassic, Cretaceous and Triassic materials of the Subbetic Zone are very disorganized and appear as olistoliths contained within the olistostrome in which Triassic materials are prevalent.
stratigraphy has been established for the epicontinental Triassic despite the
difficulties encountered in the age determination of Triassic rocks in the
Betic Cordillera, as well as those which derive from the tectonics. The Ladinian
Buntsandstein has been identified in the External Prebetic Zone, although it
has not been ruled out that in the Subbetic Zone an Anisian Buntsandstein may
outcrop. The Muschelkalk (Majanillos Formation) has only one carbonate
section, without an intercalated detrital subunit between the two carbonate
sections, as occurs in other regions of the
In the Muschelkalk facies one deepening and another shallowing-up sequence have been identified and are separated by a succession of facies which constitute the evolution of the depositional system of the ramp to carbonate platform with lagoon. This succession corresponds to a complete cyclostratigraphic unit which is absent in all of the stratigraphic sections.
The lowest part of the Keuper still belongs to the upper cyclostratigraphic unit of the Muschelkalk in which the marine deposits are replaced by coastal deposits. In general, the Keuper facies is interpreted as fluvial-coastal deposits which finally evolve progressively into very shallow marine deposits. The latter facies clearly define another cyclostratigraphic unit in the middle and upper part of the Keuper.
Above the Keuper are the Zamoranos Formation carbonates of the upper cyclostratigraphic unit. This Formation corresponds to the most important transgressive stage of the Norian.
The Rhaetian is mainly represented by the sulphates of the Carcelen Anhidrite unit which belongs to the cyclostratigraphic unit that developed during the Hettangian and is hardly distinguishable in the Betic Cordillera.
The thickness, as well as the characteristics of the units, are strongly connected to the geodynamic context in which these sediments were deposited. These deposits reflect the expansive character of the basin in relation to the beginning of the rifting stage during the Triassic. This is so because the upper units occupy larger and larger areas within the basin. On the other hand, the variations in the thickness of the units, reflect an increase in the accomodation space due to a strong subsidence controlled by the tectonics. This is particularly the case with respect to substantial thickness of the detrital units K1 and K3 and the evaporitic unit K5, in comparison to other units.
From another vantage point, the tectonics in its most important rifting stage during the Jurassic and the Cretaceous, and in its compressive phase during the alpine orogeny, causes fragmentation and expansion processes in the Triassic rocks. It also brings about diapirism and resedimentation processes in the Mesozoic and especially in the Neogene basin, thus giving way to the Olistostromic Subbetic Complex.
This study forms part of the results obtained under Research Project PB97--1201, financed by the DGES-IC, and the Research Group RNM 0163 of de Junta de Andalucía.
Auboin J (1965) Geosynclines, Devel in Geotectonics vol 1, pp 335.
Azema J, Foucault A, Fourcade E, García Hernández M, González Donoso JM, Linares A Linares D, López Garrido AC, Rivas P, Vera J (1979) Las Microfacies del Jurásico y Cretácico de las Zonas Externas de las Cordilleras Béticas. Scr Publ Univ Granada, pp 83.
Bertrand M, Kilian W (1889) Etudes sur les
terrains secondaires et tertiares dans les provinces de Grenade et Malaga. In
(1983) Aspects of Middle and Late Triassic Palynology. 3. Palynology of the
Hornos-Siles Formation (Prebetic Zone, Provincie of Jaén,
Blumenthal M (1927) Versuch einer tektonischen gliederug der betischen cordilleren von Central, und Sud-West Andalusien. Ed Geol Helv, 20:487-592.
Blumenthal M (1931) Géologie des chaînes pénibétiques et subbétiques entre Antequera et Loja et zones limitrophes (Andalousie). Bull Soc Géol France 5:23-94.
Bourgois J (1975) Présence de breches d'origine sedimentaire a élements de Cretacé au sein du Trias germano-andalou. Hypothèses sur la signification de cette formation (Andalousie, Espagne). Bull Soc Géol France 17:1095-1100.
Busnardo R (1975) Prébétique et subbétique de Jaen á Lucena (Andalousie). Introduction et Trias. Doc Lab Geol Fac Sci Lyon 66, Lyon.
Calvet F, Tucker M, and Henton M (1990) Middle Triassic carbonate ramp systems tracts, sequences and controls. In: Tucker ME, Wilson JL, Crevello PD, Sarg JR and Read JF(eds), Carbonate Platforms, Facies, Sequences and Evolution. IAS Spec Publ, 9:79-108.
F, Arche A and López-Gómez J (1998) Epicontinental Marine Carbonate Sediments
of the Middle Triassic in the Westernmost Part of the
Comas MC (1978) Sobre la geología de los montes orientales: sedimentación y evolución paleogeográfica desde el Jurásico al Mioceno inferior. PhD Thesis Univ Bilbao.
Comas MC and García Dueñas V (1988) La
evolución de un segmento del Paleomargen Sudibérico:
Cruz-Sanjulián JJ (1974) Estudios
geológicos del sector Cañete
Cruz-Sanjulián JJ (1976) Die Antequera-Osuna-Decke und ihre Beziehungen zum Subbetikum sowie zu den Flyscheinheiten des Campo de Gibraltar (Westliches Betisches Gebirge: Südspanien), Geol Jb, 20:115-129.
Dupuy de Lome E (1965) El concepto del olistostromo y su aplicación a la geología del subbético. Bol Inst Geol Min Esp, 76:1-23.
Durand Delga M, Fontboté JM (1980) Le
cadre structurale de
Fallot P (1944) Sur le rôle des ablations basales dans la nappe subbétique. CR Acad Sci Paris 218:240-241.
Fontboté JM, Vera JA (1984)
Foucault A (1966) Le diapirisme des
terrains triasiques au Secondaire et au Tertiaire dans le Subbétique du NE de
Foucault A (1971) Etude géologique des environs des sources du Guadalquivir (province de Jaen et de Grenade, Espagne méridionale). PhD Thesis Univ Paris 633, Paris.
García A, Segura M, Calonge A and Carenas
B (1989) Unidades estratgráficas para la organización de la sucesión
sedimentaria del Albiense-Cenomaniense de
García Cortés A, Mansilla H and Quintero I
(1991) Puesta de manifiesto de
García Dueñas V (1969) Les unités allochtones de la zone Subbétique dans la trasversale de Grenade (Cordillères Bétiques, Espagne). Rev Géogr Phys Géol Dyn 11:211-222.
García Hernández M, López Garrido AC, Rivas P, Sanz de Galdeano C and Vera JA (1980) Mesozoic Paleogeographic evolution of the external zones of the Betic Cordillera. Geol Mijnb 59 155-168.
García Rossell L (1973) Estudios geológicos de la transversal Ubeda-Huelma y sectores adyacentes. PhD Thesis Univ Granada.
Goy A and Martínez G (1996) Nautiloideos
del Triásico Medio en
Goy A and Pérez-López A (1996) Presencia
de cefalópodos del tránsito Anisiense-Ladiniense en las facies Muschelkalk de
Garrido Megías A and Villena J (1977). El Trias Germánico en España. Paleogeografía y estudio secuencial. Cuad Geol Ibérica 4:37-56.
Haq BU, Hardenbol J and Vail PR (1987) Chronology of fluctuating sea levels since the Triassic. Science, 235: 1156-1167.
Hermes JJ (1985) Algunos aspectos de la estructura de la zona Subbética (Cordilleras Béticas, España Meridional). Estudios Geol 41:157-176
Hubbard (1988) Bull Am As Petrol Geol, 72:49-72.
Leclerc J (1971) Etude géologique du massif du Maigmo et de ses abords (Prov. d'Alicante-Espagne). PhD Thesis Univ Paris 128, Paris.
López-Garrido AC (1971) Geología de
López-Garrido AC, Rodríguez Estrella 1970
Características sedimentarias de
López-Garrido AC, Pérez-López A, Sanz de Galdeano C (1997) Présence de faciès Muschelkalk dans des unités alpujarrides de la région de Murcie (Cordillère bétique, sud-est de l'Espagne) et implications paléogéographiques. CR Acad Sci Paris série II a 647-654.
López-Gómez (1985) Sedimentología y
estratigrafía de los materiales pérmicos y triásicos del sector SE de
and Arche (1992) Paleogeographical significance of the Röt (Anisian,
Triassic) Facies (Marines clays, muds and marls Fm.) In the Iberian ranges,
López-Gómez and Arche (1993) Sequence stratigraphic analysis and paleogeographic interpretation of the Buntsandstein and Muschelkalk facies (Permo-Triassic) in the SE Iberian Range, E Spain Palaeogeogr Palaeoclimatol Palaeoecol, 103:179-201.
Márquez-Aliaga (1985) Bivalvos del
Triásico medio del Sector Meridional de
McKee EO, Grosby EJ and Berryhill HL (1967) Flood deposits, Bijou Creek, Colorado. Jour Sed Petrology 37 929-851.
Martín-Algarra A (1987) Evolución
geológica alpina del contacto entre las Zonas Internas y las Zonas Externas
Martín-Algarra A, Solé de Porta N and Marquez-Aliaga A (1995) Nuevos datos sobre la estratigrafía, paleontología y procedencia paleogeográfica del Triásico de las escamas del Corredor del Boyar (Cordillera Bética Occidental). Cuad Geol Ibérica 19:279-307.
Mauthe F (1970) Das Subbetische Schollenland zwischen Olvera und Montellano (Prov. Cádiz und Sevilla, Südwestspanien). Geol Jb 88:421-469.
Nieto M, Molina JM, Ruiz Ortiz PA (1992) Influencia de la tectónica de fractura y del diapirismo en la sedimentación del Jurásico y Cretácico basal al sur de la provincia de Jaén (Zona Subbética). Rev Soc Geol España 5:95-111.
Ortí F (1974) El Keuper del Levante Español. Litoestratigrafía, Petrología y Paleogeografía de la cuenca. Estudios Geol 30:7-46.
Ortí F (1987) Aspectos sedimentológicos de
las evaporitas del Triásico y del Liásico inferior en el E de
Ortí F (1990) Intoducción al Triásico
evaporítico del sector central valenciano. In: Ortí F and Salvany JM (eds)
Formaciones evaporíticas de
Ortí F and Pérez-López A (1994) El Triásico Superior de Levante. III Coloquio de Estratigrafía y Paleogerografía del Pérmico y Triásico de España, Cuenca.
Ortí F and Pueyo JJ (1983) Origen marino de la sal triásica del domo de Pinoso (Alicante, España). Acta Geol Hispánica 18:139-145.
Ortí F, García-Veigas J, Rossell L, Jurado
MJ and Utrilla R (1994) Formaciones salinas de las cuencas triásicas en
Pérez-López A (1991) El Trías de facies
germánica del sector Central de
A (1996) Sequence model for coastal-plain depositional systems of Upper
Triassic (Betic Cordillera,
A (1998) Pot and gutter casts related to tempestites in a Shoreline to
offshore model of Middle Triassic platform (
Pérez-López A and Fernández J (1992)
Secuencias deposicionales reconocidas en el Trías de
Pérez-López A, López-Chicano M (1989)
Estudio sedimentológico del Keuper inferior, a partir del análisis de facies,
en el sector central de
Pérez-López and Sanz de Galdeano (1994)
Tectónica de los materiales triásicos en el sector central de
Pérez-López A, Fernández J, Solé de Porta
N, Márquez Aliaga (1991) Bioestratigrafía del Triásico de
Pérez-López A, Solé de Porta N, Márquez
Sanz L, Márquez Aliaga, A (1992) Caracterización y datación de una unidad
carbonática de edad Noriense (Fm. Zamoranos) en el Trías de
Pérez-López A, Solé de Porta N, Ortí F (1996) Facies carbonato-evaporíticas del Trías Superior y tránsito al lías en el Levante español nuevas precisiones estratigráficas.
Cuad Geol Ibérica, 20:245-269.
Peyre Y (1960-62) Etat actuel de nos connaissances sur la structure des Cordillères bétiques sur la transversale de Malaga (faits nouveaux, problèmes et hypothèses). Mém hors série Soc géol France 1:199-208.
Peyre Y (1974) Géologie d'Antequera et de sa région (Cordillères bétiques, Espagne). Lab Géol Méditerranéenne, PhD Thesis Univ Paris.
Rivas P, Sanz de Galdeano C, Vera JA (1979) Itinerario Geológico por las Zonas Externas de las Cordilleras Béticas. Itinerario Granada Jaén y Cabra Loja. Secr Publ Univ Granada.
Roldán-García FJ (1988) Estudio geológico de las unidades neógenas comprendida entre Espejo y Porcuna (Provincias de Córdoba y Jaén). Depresión del Guadalquivir. Licen Thesis Univ. Granada.
Roldán-García FJ, García-Cortés A (1988)
Implicaciones de materiales triásicos en
Sanz de Galdeano C (1973) Geología de la
transversal Jaen-Fraile (Provincia de Jaén). PhD Thesis Univ Granada 83,
Galdeano C (1990) Geologic evolution of the Betic Cordilleras in the
Galdeano C, Vera JA (1992) Stratigraphic record and palaeogeographical
context of the Neogene basins in the Betic
Sopeña A, Virgili C. Arche A, Ramos A,
Hernando S. (1985) El Triásico. In: Comba JA (ed) Libro jubilar J.M. Rios,
Geologia de España. IGME,
A, López-Gómez J, Arche A, Pérez-Arlucea M, Ramos A, Virgili C and Hernando S
(1988) Permian and Triassic rift basins of the Iberian Peninsula. In:
Manspeizer W (ed) Triassic-Jurassic Rifting (Dev. Geotech., 22B) Elsevier,
Tunbridge IP (1984) Facies model for a saudy ephemeral stream and clay playa complex: The Middle Devonian Trentishoe Formation of North Devon, U.K. Sediment 31:697-715.
Utrilla R, Pierre C, Ortí F, Rosell M, Ingles M, Pueyo J (1987) Estudio isotópico de los sulfatos en formaciones evaporíticas mesozoicas marinas y terciarias continentales. Aplicación a la cuenca del Tajo. II Congr Geoquimica de España, Soria, 91-94.
Vera JA (1988) Evolución de los sistemas de depósito en el margen ibérico de las Cordilleras Béticas. Rev Soc Geol España 1:373-391.
Virgili C, Sopeña A, Ramos A, Hernando S (1977) Problemas de la cronoestratigrafía del Trías en España.Cuad Geol Ibérica 4:57-87.