Olmos Formation

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| name = Olmos Formation

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| type = Formation

| age = Late Campanian-Early Maastrichtian

| period = Maastrichtian

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| region = Coahuila, Texas

| country = Mexico, United States

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File:Austin Chalk stratigraphic column in Texas.png in Texas]]

The Olmos Formation is a geologic formation in Mexico. It preserves fossils of plants, hadrosaurs like Kritosaurus,{{Cite book |last=Lucas |first=Spencer G. |url=https://www.google.com/books/edition/Late_Cretaceous_Vertebrates_from_the_Wes/rCDYCQAAQBAJ?hl=en&gbpv=0 |title=Late Cretaceous Vertebrates from the Western Interior: Bulletin 35 |last2=Sullivan |first2=Robert M. |date=2006 |publisher=New Mexico Museum of Natural History and Science |page=273 |language=en}} ceratopsians, tyrannosaurs and the turtle Palauchelys montellanoi dating back to the Cretaceous period.{{cite journal|last1=Estrada-Ruiz|first1=Emilio|last2=Martinez Cabrera|first2=Hugo I.|last3=RS Cevallos-Ferriz|first3=Sergio|title=Fossil woods from the late Campanian–early Maastrichtian Olmos Formation, Coahuila, Mexico |journal=Review of Palaeobotany and Palynology|date=June 2007|volume=145|issue=1|pages=123–133|doi=10.1016/j.revpalbo.2006.09.003|url=https://www.researchgate.net/publication/222248171}}{{cite journal|last1=Upchurch|first1=G. R.|last2=Estrada-Ruiz|first2=E.|last3=Cevallos-Ferriz|first3=S. S.|title=Did tropical rainforest vegetation exist during the Late Cretaceous? New data from the late Campanian to early Maastrichtian Olmos Formation, Coahuila, Mexico.|journal=American Geophysical Union, Fall Meeting |volume=2008|pages=11D–07|date=December 2008|bibcode=2008AGUFMPP11D..07U}}{{cite journal|last1=Estrada-Ruiz|first1=E.|last2=Martínez-Cabrera|first2=H.I.|last3=Cevallos-Ferriz|first3=S.R.|title=Upper Cretaceous woods from the Olmos Formation (late Campanian-early Maastrichtian), Coahuila, Mexico|journal=American Journal of Botany|date=July 2010|volume=97|issue=7|pages=1179–94|url=https://www.researchgate.net/publication/222248171|doi=10.3732/ajb.0900234|pmid=21616869}}{{cite journal|last1=Alejandro Ramírez Velasco|first1=Angel|last2=Hernandez Rivera|first2=Rene|last3=Servin-Pichardo|first3=Ricardo|title=The Hadrosaurian Record from Mexico|journal=HADROSAURS, Chapter: Biogeography and Biostratigraphy|date=January 2014|pages=340–360|url=https://www.researchgate.net/publication/278018253}}{{cite journal|last1=Gerardo Porras-Muzquiz|first1=Hector|last2=Lehman|first2=Thomas M.|title=A ceratopsian horncore from the Olmos Formation (early Maastrichtian) near Múzquiz, Mexico|journal=Revista Mexicana de Ciencias Geológicas|date=August 2011|volume=28|issue=2|pages=262–266|url=https://www.researchgate.net/publication/286279674}}{{cite journal|last1=Ramírez-Velasco|first1=A. A|last2=Hernández-Rivera|first2=R.|title=Diversity of Late Cretaceous dinosaurs from Mexico|journal=Boletín Geológico y Minero|date=2015|volume=126|issue=1|pages=63–108|url=https://www.academia.edu/12268212|accessdate=28 September 2016}}