Micropaleontology of lower portion of Boquillas Formation near Hot Springs, Big Bend National Park, Brewster County, Texas



Journal Title

Journal ISSN

Volume Title


Texas Tech University


The Boquillas Formation, continuously exposed near Boquillas in Big Bend National Park in southeastern Brewster County, has been measured, sampled, and described by the writer. The contained microfossils have been identified to species, and a key to their identification has been constructed as an aid to future workers. The Boquillas Formation, previously divided into two unnamed members by workers from the Bureau of Economic Geology of The University of Texas, is correlated with the Britton and Arcadia Park Formations of the Eagle Ford Group in Central Texas. Paleoecologic factors and physical evidences have been used to determine the theoretical environment of deposition of the Boquillas Formation. The findings indicate that the formation consists of rocks deposited in a transgressive sea.