Multiproxy taphonomic analysis in the Los Colorados Formation (Upper Triassic), Ischigualasto-Villa Unión Basin, Argentina: a case study through sauropodomorph remains
LEANDRO M. PÉREZ; ALEJANDRO OTERO; PABLO ALONSO MURUAGA; LEANDRO GAETANO; JUAN LEARDI; VERÓNICA KRAPOVICKAS; DANIEL POIRÉ
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
PERGAMON-ELSEVIER SCIENCE LTD
Lugar: Amsterdam; Año: 2022
We present the first taphonomic analysis on basal sauropodomorph dinosaur bone remains from the Los Colorados Formation. We analyzed 22 bone samples with X-ray diffractometry, three of these in petrographic sections and one of them in SEM. In this article, we recognized the taphonomic processes (biostratinomic and fossildiagenetic) involved in the genesis of the La Esquina Local Fauna. Regarding fossil diagenesis, it was possible to recognize the different processes that acted on the bone remains. In this sense, it was possible to observe the different types of fractures present in the bones and their relationship with expansion generated by changes in the volume of minerals (for example, carbonates, gypsum and anhydrite). Finally, the tetrapod distribution during Carnian-Norian could by explain the abundance of vertebrate fossils in the Los Colorados Formation, added this to the taphonomic features of the fossil record of this unit.