Usage:
Hyde Formation of Mowich Group (OR*)
Geologic age:
Jurassic, Early*
Type section, locality, area and/or origin of name:
Type area: at South Fork Bridge on South Fork of John Day River, in sec. 30, T. 17 S., R. 28 E., in bottom of South Fork Valley, Suplee-Izee district, central OR. Named from John Hyde Ranch at mouth of Poison Creek, Cook [Grant] Co., east-central OR (Lupher, 1941; Beaulieu, 1972).
AAPG geologic province:
Snake River basin*
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 ([ ]).