Dewey Formation

The Dewey Formation is a geologic formation in Iowa and Oklahoma. It preserves fossils dating back to the Carboniferous period.

Dewey Formation
Stratigraphic range: Carboniferous
Type	Formation
Lithology
Primary	Limestone
Location
Region	Iowa, Oklahoma
Country	United States
Type section
Named for	Dewey, Washington County, Oklahoma
Named by	D. W. Ohern, 1910[1]

See also

• Earth sciences portal
• Iowa portal
• Paleontology portal

• List of fossiliferous stratigraphic units in Iowa
• Paleontology in Iowa