Usage:
Magill Member of Trowbridge Formation (OR)
Geologic age:
Jurassic, Middle
Type section, locality, area and/or origin of name:
Type area: exposures in NE/4 sec. 32, T. 17 N., R. 28 E., Suplee-Izee area, Grant Co., east-central OR. Named from Magill Creek (Dickinson and Vigrass, 1965).
AAPG geologic province:
Blue Mountains province
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 ([ ]).