Escondido Formation

{{short description|Geologic formation in Texas, United States}}

{{Infobox rockunit

| name = Escondido Formation

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| type = Formation

| age = Late Cretaceous, {{fossilrange|70.6|66.043}}

| period = Maastrichtian

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| region = Texas & Coahuila

| country = Mexico & United States

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| unitof = Navarro Group{{cite web |url=https://ngmdb.usgs.gov/Geolex/Units/Escondido_7656.html |title=National Geologic Map Database entry: Escondido |author= |date= |website=ngmdb.usgs.gov |publisher=United States Geological Survey |access-date=8 November 2019 |quote=}}

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

The Escondido Formation is a geologic formation in Texas and Coahuila, Mexico. It preserves fossils dating back to the Late Cretaceous period.{{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021|archive-date= 25 March 2022|archive-url= https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home|url-status= live}}{{Cite journal |last=Cannon |first=Robert Lee |date=August 1922 |title=The fauna of the Escondido formation |url=https://repositories.lib.utexas.edu/items/034eb766-6799-4b7b-8acc-2e5aa602559a}}{{Cite journal |last=Snedden |first=John W. |date=1991 |title=Origin and Sequence Stratigraphic Significance of Large Dwelling Traces in the Escondido Formation (Cretaceous, Texas, USA) |url=https://www.jstor.org/stable/3514917 |journal=PALAIOS |volume=6 |issue=6 |pages=541–552 |doi=10.2307/3514917 |jstor=3514917 |bibcode=1991Palai...6..541S |issn=0883-1351|url-access=subscription }} These fossils include ammonites,{{Cite journal |last1=Kennedy |first1=W. J. |last2=Cobban |first2=W. A. |date=January 1993 |title=Maastrichtian ammonites from the Corsicana Formation in northeast Texas |url=https://www.cambridge.org/core/journals/geological-magazine/article/abs/maastrichtian-ammonites-from-the-corsicana-formation-in-northeast-texas/A37533D2D5C19CBDB3FA8D447D67C469 |journal=Geological Magazine |language=en |volume=130 |issue=1 |pages=57–67 |doi=10.1017/S0016756800023724 |bibcode=1993GeoM..130...57K |issn=1469-5081|url-access=subscription }} dyrosaurs like Sabinosuchus,{{Cite journal |last=Shiller |first=Thomas A. |date=December 2012 |title=A dyrosaurid crocodilian from the cretaceous (Maastrichtian) Escondido formation of Coahuila, Mexico |url=https://ttu-ir.tdl.org/items/27ad8b93-cc6d-4fcf-a9d8-29981699a0e8}}{{Cite journal |last1=Shiller II |first1=Thomas A. |last2=Porras-Muzquiz |first2=Hector G. |last3=Lehman |first3=Thomas M. |date=2016-11-01 |title=Sabinosuchus coahuilensis, a new dyrosaurid crocodyliform from the Escondido Formation (Maastrichtian) of Coahuila, Mexico |url=https://www.tandfonline.com/doi/abs/10.1080/02724634.2016.1222586 |journal=Journal of Vertebrate Paleontology |volume=36 |issue=6 |pages=e1222586 |doi=10.1080/02724634.2016.1222586 |bibcode=2016JVPal..36E2586S |issn=0272-4634|url-access=subscription }} crustaceans and corals.{{Cite journal |last=Stephenson |first=Lloyd William |date=1941 |title=The larger invertebrate fossils of the Navarro Group of Texas : (exclusive of corals and crustaceans and exclusive of the fauna of the Escondido formation) |url=https://repositories.lib.utexas.edu/items/6cdddd4b-a353-4c10-ba98-0abdfcc9e74d |language=en}}