Usage:
Amphitheater Group (AK)
Amphitheater Basalt (AK)
Originally misspelled Amphitheatre.
Subunits:
GROUP STATUS (alphabetical) --all in AK: /Boulder Creek Volcanics [not incl. in this lexicon], Paxson Mountain Basalt, Tangle Lakes Formation
Geologic age:
Triassic
Type section, locality, area and/or origin of name:
Notable exposures: forms most of Amphitheatre [Amphitheater] Mountains, northwest of Paxson, in northwest part of Copper River basin, [Mount Hayes A-4 quadrangle, scale 1:63,360], southeastern AK; extends from Gakona River westward to Susitna River, nearly 100 mi (Rose and Saunders, 1965).
AAPG geologic province:
Alaska Southern 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 ([ ]).