Usage:
Trail Member of Ericson Sandstone (CO,WY)
/Trail zone (informal) of Ericson Formation (WY)
For informal usage, the rank or lithologic term should not be capitalized. ["Zones" are intended to delineate rocks deposited during a time of existence of a particular faunal or floral assemblage (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021).]
Geologic age:
Late Cretaceous
Type section, locality, area and/or origin of name:
Not designated. Apparently named from its occurrence in Mountain Fuel Supply Company's Trail field in the Vermillion basin, [in T. 13 N., R. 100 W., Sweetwater Co.], WY (Smith, 1961).
AAPG geologic province:
Green River 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 ([ ]).