Usage:
Hyd Group (AK*)
Hyd Formation (AK*)
Subunits:
GROUP STATUS: Keku Islets area, AK, includes (alphabetical) Burnt Island Conglomerate*, Cornwallis Limestone*, Hamilton Island Limestone*, and Hound Island Volcanics*; Gravina Island, AK, includes (alphabetical) Chapin Peak Formation*, Nehenta Formation*, and Puppets Formation*.
Geologic age:
Triassic, Late*
Type section, locality, area and/or origin of name:
Southeast shore of peninsula where Hyd triangulation station is located, northeast shore of Pybus Bay, south Admiralty Island, southeastern AK (Loney, 1964).
AAPG geologic province:
Alaska Southeastern 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 ([ ]).