RIQUEZA DEL REGISTRO FÓSIL DE JALISCO, MÉXICO

Abstract

Fossil deposits ranging from lower Cretaceous to the Quaternary are found in Jalisco state, western Mexico. This study presents a systematic list of the fossil record of Jalisco, Mexico, and analyze the composition of their richness. The corresponding literature was reviewed and the main paleontological collections with fossil material from the region were consulted. A total of 293 species organized into three kingdoms, six phyla, 12 classes, 49 orders, 87 families, and 184 genera were recorded. A total of 67 species (22.9%) are microfossils and 226 (77.1%) are macrofossils. Microfossils include two species of foraminifera (3%) and 65 of diatoms (97%). Among macrofossils, the best represented group at class level are Mammalia with 110 species (48.7%), followed by Gastropoda with 37 (16.4%), Sauropsida with 35 (15.5%), and Teleostei with 30 (13.3%); the least represented classes are Isopoda, Scaphopoda, Amphibia, and Magnoliopsida with a single record each. The best represented period is the Quaternary with 199 species (67.9%), followed by the Neogene with 49 species (16.7%), and finally the Cretaceous with 45 (15.4%). By locality, the richest are Chapala and Zacoalco for the Quaternary, Tecolotlán of the Neogene, and Tamazula for the Cretaceous. The species included were registered from 1875 to 2022.