Usage:
Cynthia Falls Sandstone of Tuxedni Group (AK*)
Geologic age:
Jurassic, Middle*
Type section, locality, area and/or origin of name:
Type section: Tonnie Creek, from 5600 ft S. 50 deg. E. of Tonnie Peak, continuing upstream for 600 ft, Iniskin Peninsula, Cook Inlet region, southwestern AK. Named from Cynthia Falls on Hardy Creek, Iniskin Peninsula (Detterman, 1963).
AAPG geologic province:
Alaska Southwestern 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 ([ ]).