Usage:
Blacklead Limestone (ID)
Geologic age:
Pennsylvanian
Type section, locality, area and/or origin of name:
Origin of name not stated by Anderson (1930), but almost certainly is Blacklead mining district, Orofino region, Clearwater Co., northern ID (US geologic names lexicon, USGS Bull. 896).
Lies far back in Clearwater Mountains at head of Cayuse Creek, a tributary of North Fork of Clearwater River. Also present in a high valley between Blacklead Peak and Rhodes Creek, Orofino region (Anderson, 1930).
AAPG geologic province:
Idaho 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 ([ ]).