Person: Horra Del Barco, Raúl De La
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First Name
Raúl De La
Last Name
Horra Del Barco
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
Identifiers
4 results
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Item New ichnites from the Middle Triassic of the Iberian Ranges (Spain): paleoenvironmental and paleogeographical implications(Historical Biology, 2010) Ganda, Georges; Horra Del Barco, Raúl De La; Galán-Abellán, Belén; López Gómez, José; Fernández Barrenechea, José María; Arche, Alfredo; Benito Moreno, María IsabelThe Iberian Basin or its present-day expression, the Iberian Ranges, was refilled with red bed sediments of alluvial origin during the late Olenekian–Anisian period represented by the Cañizar (Olenekian–Anisian) and Eslida (Anisian) Formations, both commonly known as Buntsandstein facies. In the late part of the Anisian, the Tethys Sea reached the eastern side of the Iberian microplate, represented by the shallow marine facies of the Landete and Cañete Formations, also called Muschelkalk facies. The ichnites studied in this paper belong to the Anisian continental-marine transition in the SE Iberian Ranges. The Cañizar Formation shows the oldest Triassic footprints found in the Iberian Peninsula, consisting in swimming, uncomplete lacertoid three digit Rhynchosauroides traces with possibly resting (cubichnia) and furrowing (pascichnia) Cruziana/Rusophycus due to large triopsids. Specimens from Lacertoïd and Crocodiloïd groups have been collected in the Eslida Formation. Rhynchosauroides sp. is the most representative ichnospecies of the first group, while in the Crocodiloïd group, the presence of Chirotherium barthii Kaup 1835 and Isochirotherium cf coureli (Demathieu 1970) are distinctive. In the Landete Formation specimens are found from Crocodiloïd and Dinosauroïd groups. Brachychirotherium gallicum Willruth 1917, Brachychirotherium sp. and Chirotherium sp. are characteristic of the first one, and ‘Coelurosaurichnus’ perriauxi and cf Paratrisauropus latus as the most representative of the second group. Some of the specimens described here present ancestors in the Early Triassic and have been described in the Triassic of North America, Italy and France. Possible paleogeographical connections with faunas of SE France can be inferred. Based on different sedimentary structures and plant remains, the footprints are related to fluvial systems within huge flood plains, playa and shallow marine environments, with alternating dry and wet periods. The vertical ichnites distribution during the Anisian shows that the fauna modification was weak at a high clade level. In the Triassic of the Iberian microplate, there are no findings of traces prior to the Anisian, and the footprint content for the Middle Triassic is less diversified than in other neighbouring regions. By comparison with other western Pangea areas, there was a later appearance of the forms after the end-Permian mass extinction event in the studied areaItem The Late Palaeozoic-Early Mesozoic from the Catalan Pyrenees (Spain): 60 Myr of environmental evolution in the frame of the western peri-Tethyan palaeogeography(Earth-Science Reviews, 2015) Gretter, N.; Ronchi, A.; López Gómez, José; Arche, Alfredo; Horra Del Barco, Raúl De La; Barrenechea, José F.; Lago San José, MarcelianoThe Eastern Catalan Pyrenees form the southernmost segment of the Pyrenean Axial Zone. They experienced complex multistage process as the result of both the Variscan and the Pyrenean orogenic cycles. After the Late Palaeozoic, several small extensional sub-basins were filled by continental successions as a response to the changing tectonic setting within the frame of the Southwestern Europe. This stratigraphic record, perfectly exposed in the studied Eastern Pyrenean areas, preserves the signatures of the Late Palaeozoic Pangea break-up during the progressive dismantling of the Variscan chain, up to the Triassic diffused extension. Despite structural network being severely affected by Cenozoic reworking, the stratigraphic framework can be unravelled by the detailed sedimentological and stratigraphical analysis of the well-exposed sequences. In short, this paper addresses facies patterns and architectural elements of Late Carboniferous-Permian-Triassic continental sections studied in the Catalan Pyrenees and aims to use these signatures for correlation not only at a regional scale but also within the broader picture of the southwestern Europe. Our stratigraphical reconstruction clearly demonstrates that the thick studied succession consists of fluvial-lacustrine basal units affected by intense volcanic activity and overlaying predominantly fluvial fining upwards units. For each unit several lithofacies, architectural elements and bounding surfaces of different order have been identified and their lateral and vertical staking characterized. Deposition and erosion processes are controlled by alternating periods of tectonic activity producing different stages of high and low subsidence, the uplift of the sub-basin margins and subsequent extended erosive events marked by angular unconformities. On the strength of the major rank bounding surfaces analysis, the studied sedimentary packages have been grouped into different tectono-stratigraphic units and then correlated; they have been contextualized within the latest palaeogeographic reconstructions of the studied sector, contributing to detail the role of the study area within the frame of the S European palaeogeography.Item Climate changes during the Early–Middle Triassic transition in the E. Iberian plate and their palaeogeographic significance in the western Tethys continental domain(Palaeogeography, Palaeoclimatology, Palaeoecology Volume 440, 15 December 2015, Pages 671-689, 2015) Borruel Abadía, Violeta; López Gómez, José; Horra Del Barco, Raúl De La; Galán Abellán, Belén; Barrenechea, José F.; Arche, Alfredo; Ronchi, Ausonio; Grette, Nicola; Marzo Carpio, MarianoUntil recently the climate of the Early–Middle Triassic at low latitudes was broadly considered as generally temperate-warm with no major climate oscillations. This work examines the climate of this period through a detailed study of the sedimentary, plant, soil and mineral records of continental rocks (Buntsandstein facies) in eastern Iberian basins. Our findings indicate temporal climate variations for these near equator (10°–14°N) regions and unveil the significance of such variations in the southern Laurasian domain. The climate of Iberia's Early Triassic was mainly dominated by alternating brief (< 0.4 ma) arid and semi-arid climate periods, with two main arid periods documented at the end of the Smithian and middle Spathian. However, an initial short subhumid to semi-arid period was also observed in the late Spathian. Remarkably, this latter period appears just after an unconformity related to the tectonically induced Hardegsen Event in western Europe. It is also of interest that this short subhumid climate period is concurrent with the beginning of faunal and floral recovery in the basins examined. The Early Triassic ended again with a short very arid period. Although the beginning of the Anisian (Aegean) was represented by alternating arid and semi-arid to subhumid intervals, during the Bithynian and Pelsonian clearly wetter climates are recorded by the succession consisting of alternating semi-arid to semi-humid intervals. This general tendency was interrupted by three short but marked intervals, two humid intervals in the late Bithynian, and one arid period near the Bithynian/Pelsonian boundary.Item Constraining the Permian/Triassic transition in continental environments: Stratigraphic and paleontological record from the Catalan Pyrenees (NE Iberian Peninsula)(Palaeogeography, palaeoclimatology, palaeoecology, 2016) Mujal, Eudald; Grette, Nicola; Ronchi, Ausonio; López Gómez, José; Falconnet, Jocelyn; Diez Ferrer, José B.; Horra Del Barco, Raúl De La; Bolet, Arnau; Oms Llobet, Oriol; Arche, Alfredo; Fernández Barrenechea, José María; Steyer, J.Sébastien; Fortuny, JosepThe continental Permian-Triassic transition in southern Europe presents little paleontological evidence of the Permian mass extinction and the subsequent faunal recovery during the early stages of the Triassic. New stratigraphic, sedimentological and paleontological analyses from Middle-Upper Permian to Lower-Middle Triassic deposits of the Catalan Pyrenees (NE Iberian Peninsula) allow to better constrain the Permian-Triassic succession in the Western Tethys basins, and provide new (bio-) chronologic data. For the first time, a large vertebra attributed to a caseid synapsid from the ?Middle Permian is reported from the Iberian Peninsula - one of the few reported from western Europe. Osteological and ichnological records from the Triassic Buntsandstein facies reveal a great tetrapod ichnodiversity, dominated by small to medium archosauromorphs and lepidosauromorphs (Rhynchosauroides cf. schochardti, R. isp. 1 and 2, Prorotodactylus-Rotodactylus, an undetermined Morphotype A and to a lesser degree large archosaurians (chirotheriids), overall suggesting a late Early Triassic-early Middle Triassic age. This is in agreement with recent palynological analyses in the Buntsandstein basal beds that identify different lycopod spores and other bisaccate and taeniate pollen types of late Olenekian age (Early Triassic). The Permian caseid vertebra was found in a playa-lake setting with a low influence of fluvial water channels and related to the distal parts of alluvial fans. In contrast, the Triassic Buntsandstein facies correspond to complex alluvial fan systems, dominated by highenergy channels and crevasse splay deposits, hence a faunal and environmental turnover is observed. The Pyrenean biostratigraphical data show similarities with those of the nearby Western Tethys basins, and can be tentatively correlated with North African and European basins. The Triassic Pyrenean fossil remains might rank among the continental oldest records of the Western Tethys, providing new keys to decipher the Triassic faunal biogeography and recovery.