Usage:
Picayune Megabreccia Member of Sapinero Mesa Tuff (CO*)
Geologic age:
early Tertiary (early Oligocene; Rupelian)*
Type section, locality, area and/or origin of name:
Named from exposures at mouth of Picayune Gulch [now spelled Picayne], a tributary to the Animas btw. Eureka and Animas Forks, [approx. Lat. 37 deg. 54 min. 40 sec. N., Long. 107 deg. 33 min. 20 sec. W.], Silverton 15-min quadrangle (1904 ed.), San Juan Co., southwestern CO (Cross and Howe, 1905).
AAPG geologic province:
San Juan Mountains province*
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 ([ ]).