Usage:
Imnaitchiak Chert of Etivluk Group (AK*)
Geologic age:
Pennsylvanian, Early* to Permian* to Triassic* to Jurassic(?)*
Type section, locality, area and/or origin of name:
Kurupa Hills on southwest side of Kurupa River, in sec. 29, T. 12 S., R. 12 W., Umiat Prime Meridian, Killik River quadrangle, northern AK (Mull and others, 1987).
Reference section: on south side of hill along lower Akmalik Creek, in NE/4 sec. 27, T. 12 S., R. 10 W., Umiat Prime Meridian (Mull and others, 1987).
AAPG geologic province:
Alaska Northern region*
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 ([ ]).