Lomas Coloradas Formation

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| name = Lomas Coloradas Formation

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| type = Geological formation

| age = Maastrichtian

| period = Maastrichtian

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| country = {{flag|Mexico}}

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The Lomas Coloradas Formation is a Mesozoic geologic formation in Mexico.{{Cite journal |last=González-León |first=Carlos Manuel |date=1994 |title=Stratigraphy, depositional environments, and origin of the Cabullona Basin, northeastern Sonora, Mexico. |url=https://repository.arizona.edu/handle/10150/186846 |language=en}}{{Citation |last=Lucas |first=Spencer G. |title=Paleontology of the Upper Cretaceous Cabullona Group, northeastern Sonora |date=1995 |work=Special Paper 301: Studies on the Mesozoic of Sonora and adjacent areas |pages=143–165 |url=https://doi.org/10.1130/0-8137-2301-9.143 |access-date=2025-03-17 |publisher=Geological Society of America |isbn=0-8137-2301-9 |last2=Kues |first2=Barry S. |last3=Gonzalez-Leon |first3=Carlos M.}}{{Cite journal |last=Ríos-Santos |first=César |last2=Cevallos-Ferriz |first2=Sergio R. S. |last3=Pujana |first3=Roberto R. |date=2020-12-01 |title=Cupressaceous woods in the Upper Cretaceous Cabullona Group in Fronteras, Sonora, Mexico |url=https://www.sciencedirect.com/science/article/abs/pii/S0895981120302996 |journal=Journal of South American Earth Sciences |volume=104 |pages=102756 |doi=10.1016/j.jsames.2020.102756 |issn=0895-9811}}{{Cite journal |last=Taliaferro |first=N. L. |date=1933 |title=An Occurrence of Upper Cretaceous Sediments in Northern Sonora, Mexico |url=https://www.jstor.org/stable/30084928 |journal=The Journal of Geology |volume=41 |issue=1 |pages=12–37 |issn=0022-1376}} Dinosaur remains are among the fossils that have been recovered from the formation, although only a few have yet been referred to a specific genus.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607. Indetermiate hadrosaur remains,{{cite book |last1=Velasco |first1=Angel Alejandro Ramírez |last2=Rivera |first2=Rene Hernandez |last3=Servín-Pichardo |first3=Ricardo |editor1-last=Eberth |editor1-first=David A. |editor2-last=Evans |editor2-first=David C. |title=The Hadrosaurian Record from Mexico |date=January 2014 |publisher=Indiana University Press |location=1320 E 10th St, Bloomington, IN 47405 |isbn=9780253013903 |pages=340–360 |url=https://www.researchgate.net/publication/278018253 |accessdate=16 November 2020}} indetermiate ceratopsian remains,{{Cite journal |last=Rivera-Sylva |first=Héctor E. |last2=Frey |first2=Eberhard |last3=Stinnesbeck |first3=Wolfgang |last4=Guzmán-Gutiérrez |first4=José Rubén |last5=González-González |first5=Arturo H. |date=2017-04-01 |title=Mexican ceratopsids: Considerations on their diversity and biogeography |url=https://www.sciencedirect.com/science/article/abs/pii/S0895981116302917 |journal=Journal of South American Earth Sciences |volume=75 |pages=66–73 |doi=10.1016/j.jsames.2017.01.008 |issn=0895-9811}} indetermiate tyrannosaur remains,{{Cite journal |last=Serrano-Brañas |first=Claudia Inés |last2=Torres-Rodríguez |first2=Esperanza |last3=Reyes Luna |first3=Paola Carolina |last4=González |first4=Ixchel |last5=González-León |first5=Carlos |date=May 2014 |title=Tyrannosaurid teeth from the Lomas Coloradas Formation, Cabullona Group (Upper Cretaceous) Sonora, México |url=https://doi.org/10.1016/j.cretres.2014.02.018 |journal=Cretaceous Research |volume=49 |pages=163–171 |doi=10.1016/j.cretres.2014.02.018 |issn=0195-6671}} indeterminate maniraptoriform remains,{{Cite journal |last=Carbot Chanona |first=Gerardo |last2=Rivera Sylva |first2=Héctor E. |date=2011 |title=Presence of a maniraptoriform dinosaur in the Late Cretaceous (Maastrichtian) of Chiapas, southern Mexico |url=https://doi.org/10.18268/bsgm2011v63n3a2 |journal=Boletín de la Sociedad Geológica Mexicana |volume=63 |issue=3 |pages=393–398 |doi=10.18268/bsgm2011v63n3a2 |issn=1405-3322}} and indeterminate sauropod remains, most likely belonging to Alamosaurus, have been unearthed here.{{cite book |last1=Osmólska |first1=Halszka |editor1-last=Weishampel |editor1-first=David B. |editor2-last=Osmolska |editor2-first=Halszka |editor3-last=Dodson |editor3-first=Peter |title=The Dinosauria |date=6 November 2004 |publisher=University of California Press |isbn=9780520242098 |page=823 |url=https://books.google.com/books?id=h4WRTHfTzXsC |accessdate=16 November 2020}}