{{Short description|Geologic formation in California, United States}} {{Infobox rockunit | name = Sweetwater Formation | image = | caption = | type = Formation | age = Paleogene | prilithology = | otherlithology = | namedfor = | namedby = | region = California | country = United States | coordinates = | unitof = | subunits = | underlies = | overlies = | thickness = | extent = | area = | map = | map_caption = }}

The '''Sweetwater Formation''' is a geologic formation in California. It preserves fossils from the Late Eocene period.<ref name=":0">{{Cite journal |last1=Walsh |first1=Stephen L. |last2=Demere |first2=Thomas A. |date=1991 |title=Age and Stratigraphy of the Sweetwater and Otay Formations, San Diego County, California |url=https://archives.datapages.com/data/pac_sepm/086/086001/pdfs/131.htm |language=en-US |pages=131–148}}</ref> It underlies the Otay Formation, which reserves fossils of the Oligocene to Miocene periods of the Cenozoic Era.<ref name=":0" />

It is located in the Peninsular Ranges province.<ref name=":0" /> The formation is composed of the angular-conglomerate, gritstone, sandstone and mudstone facies.<ref>{{Cite journal |last=Scheidemann |first=Robert C. Jr. |last2=Kuper |first2=Herman T. |date=1979 |title=Stratigraphy and Lithofacies of the Sweetwater and Rosarito Beach Formations, Southwestern San Diego County, California and Northwestern Baja California, Mexico |url=https://archives.datapages.com/data/pac_sepm/027/027001/pdfs/107.htm |language=en-US |pages=107–118}}</ref>

==See also== {{Portal|Earth sciences|California|Paleontology}} * List of fossiliferous stratigraphic units in California * Paleontology in California

==References== {{Reflist}} * {{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}}

Category:Paleogene California Category:Conglomerate formations of the United States Category:Sandstone formations of the United States Category:Mudstone formations of the United States Category:Geologic formations of California

{{California-geologic-formation-stub}} {{Paleogene-stub}}