Rich Fountain Formation

{{Short description|Geologic formation in Missouri, United States}}

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| name = Rich Fountain Formation

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| type = Formation

| age = Ordovician

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| namedfor = Rich Fountain, Osage County, Missouri

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| region = Missouri

| country = United States

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The Rich Fountain Formation is a geologic formation in Missouri. It preserves fossils dating back to the Ordovician period.

The Rich Fountain was proposed in 1944 as the equivalent of the lower part of the Jefferson City Formation in a new Jefferson City Group. The Theodosia Formation was proposed as the equivalent of the upper Jefferson City and the lower portion of the overlying Cotter Formation.[http://www.dnr.mo.gov/geology/geosrv/ogc/docs/RI-073.pdf Thompson, Thomas L., 2001, Lexicon of Stratigraphic Nomenclature in Missouri, Missouri Department of Natural Resources, Division of Geology and Land Survey, Report of Investigation Number 73, p 239 and 287]