{{Short description|Geologic formation in Oregon, United States}} {{One source|date=May 2026}}
{{Infobox rockunit | name = Camas Valley Formation | image = | caption = | type = Formation | age = Early Eocene (Paleogene) | prilithology = Mudstone, siltstone | otherlithology = Sandstone (minor) | namedfor = Camas Valley | namedby = | region = Douglas County, Oregon | country = United States | coordinates = {{Coord|43.3099|-123.0800|display=inline,title}} | unitof = Umpqua Group | subunits = | underlies = Tyee Formation | overlies = Umpqua Group strata | thickness = over {{cvt|1,500|ft}} | extent = Southern Oregon Coast Range | area = | map = | map_caption = }} The '''Camas Valley Formation''' is an early Eocene marine unit within the southern Tyee Basin composed predominantly of dark-gray mudstone and siltstone with minor sandstone interbeds. The formation was deposited during a marine transgression in relatively low-energy conditions and locally contains calcareous concretions and fossiliferous beds. It conformably overlies older Umpqua Group strata and is overlain by the Tyee Formation. The unit is regionally extensive in the southern Oregon Coast Range and commonly reaches thicknesses of more than 1,500 feet.<ref>{{cite report |last1=Ryu |first1=In-Chang |last2=Niem |first2=Alan R. |last3=Niem |first3=Wendy A. |title=Oil and gas potential of the southern Tyee basin, southern Oregon Coast Range |series=Oil and Gas Investigations |number=19 |publisher=Oregon Department of Geology and Mineral Industries |location=Portland, Oregon |year=1996 |url=https://pubs.oregon.gov/dogami/ogi/OGI-19.pdf |archive-url=https://web.archive.org/web/20240707113031/https://pubs.oregon.gov/dogami/ogi/OGI-19.pdf |archive-date=2024-07-07 }}</ref>
== See also == * List of fossiliferous stratigraphic units in Oregon * Paleontology in Oregon
== References == {{reflist}}
Category:Paleogene geology of Oregon Formations Category:Geologic formations of Oregon
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