Usage:
Masonic Park Tuff (CO*,NM*)
Geologic age:
early Tertiary (early Oligocene; Rupelian)*
Type section, locality, area and/or origin of name:
Type area: palisade exposures along Rio Grande Valley near Masonic Park, 5 km northwest of South Fork, Rio Grande Co., CO (Lipman, 1975).
AAPG geologic province:
San Juan basin*
San Juan Mountains province*
San Luis 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 ([ ]).