No current usage.
(†La Plata Group, †La Plata Formation, or †La Plata Sandstone (CO,NM,UT) abandoned and replaced with Morrison Formation and Entrada Sandstone. See Morrison and Entrada.)
Late Jurassic
Named from extensive development in La Plata Mountains, La Plata Co., CO (Cross and Purington, 1898).
San Juan basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).