Usage:
Copenhagen Formation (NV*)
Geologic age:
late Middle to Late Ordovician (Whiterockian to Mohawkian; Chazyan to Chatfieldian)*
Type section, locality, area and/or origin of name:
[Principal reference section]: west side of Martin Ridge, 1 mi southeast of union of Ryegrass Canyon with Copenhagen Canyon, [Horse Heaven Mountain 15-min quadrangle, Eureka Co., Toiyabe National Forest, central Nevada] (Merriam, 1963, pl. 2, loc. 10).
AAPG geologic province:
Great Basin 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 ([ ]).