Durante el pasado XXIII Encuentro de Jóvenes Investigadores en Palentología celebrado entre el 21 y el 25 de abril con sede en Buñol, algunos intregrantes del Grupo de Biología Evolutiva de la UNED presentaron el trabajo sobre icnología del triásico titulado “First chirotheriid trackway from the early Middle Triassic (Buntsandstein Facies) in Bogarra (Albacete, Spain)” en forma de comunicación oral. Durante la conferencia se explicó el contexto geográfico y geológico, ya que posee una alta relevancia por su localización y su posición cronoestratigráfica dado que es el primer registro de este tipo de huellas en la provincia de Albacete, la asignación tentativa a icnogénero Isochirotherium, la cual se asocia a arcosaurios crurotarsales y la digitalización del afloramiento para preservar la información paleobiológica debido a que la alta tasa de meteorización que sufre y su rápido deterioro no permiten el empleo de métodos de conservación sobre el propio yacimiento. A continuación, el resumen de dicha presentación:
Trackways from the Middle Triassic attributed to archosaurs are generally classified within the chirotheriid ichnotaxa Chirotherium-Isochirotherium-Brachychirotherium. A new trackway recorded within the Buntsandstein Facies (early Middle Triassic) at the Arroyo de Haches site, in the municipality of Bogarra (Albacete) is described. The tracks occur associated with fluvial deposits, being found on a layer of shales with marmorization due to edaphic activity. The ichnites are preserved as concave epireliefs. The trackway includes impressions of two pes (left and right) and a left manus, being the left manus-pes set the best-preserved. The pes impressions are pentadactyl and plantigrade to digitigrade. Digits II-IV are longer than digits I and V, with digit III being the longest and digit II slightly longer than digit IV. The manus impression is pentadactyl and digitigrade. There is evidence of mud collapse hiding phalangeal pads and the modification of digit I, making it slightly shorter than digit IV. The length/width ratio are 1.277 for the pes and 0.659 for the manus.The trackway is preliminarily assigned to the ichnogenus Isochirotherium based on the relationship between the digits already described in the previous paragraph, the pes/manus size ratio which is 0,27, the fact that the pes/manus couple is slightly turned outward with respect to the midline of the trackway (from 21º to 32º) and, in the manus, the phalangeal-metatarsal pads are fused with the proximal ends in digits II, III and IV. The finding is unique in this geographical area to date, but the sedimentological and geomorphological features of the site have significant risk factors for deterioration threatening the stability of the trackway. In fact, the surface of the stratum is fractured, and due to its friable nature, it is highly weathered. Restoration and future studies on the conservation of the site are necessary to ensure its preservation.
Más información:
- Referencia: García-Vizcaíno, A., Mestres, S., Mora, J., Ortega, F. First chiroteriid trackway from the early Middle Triassic (Buntsandstein Facies) in Bogarra (Albacete, Spain). XXIII Encuentro de Jóvenes Investigadores en Paleontología (EJIP), Buñol, Valencia.
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