Usage:
Quadrant Quartzite (ID*,MT*,WY*)
Quadrant Formation (ID*,MT*,WY*)
Quadrant Sandstone (ID*,MT*,WY)
Subunits:
Tyler Sandstone Member (MT).
Geologic age:
Pennsylvanian*; locally Late Mississippian to early Permian*
Type section, locality, area and/or origin of name:
Named from Quadrant Mountain in southern Gallatin Range, northwest corner of Yellowstone Park, Wyoming, where it forms a picturesque bluff encircling the mountain, [in the vicinity of Lat. 44 deg. 55 min. N., Long. 110 deg. 50 min. W.], northwest WY (Weed, 1896).
[Considered type locality by the US Geologic Names Committee (ca. 1938).]
AAPG geologic province:
Central Montana uplift*
Idaho Mountains province*
Montana folded belt*
Snake River basin*
Sweetgrass arch*
Yellowstone 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 ([ ]).