Huckleberry Ridge Tuff of Yellowstone Group (ID*,MT*,WY*)
Huckleberry Ridge Tuff (ID*,MT*,WY*)
Huckleberry Ridge ash bed (informal) (CA*,ID*,IA*,KS*,MT*,NE*,NV*,TX*,UT*)
Huckleberry Ridge ash bed is downwind equivalent of Huckleberry Ridge Tuff (previously called Pearlette type B ash bed).
For informal usage, the rank or lithologic term should not be capitalized.
late Tertiary (late Pliocene)*
Age determined using 1.8 Ma as Plio-Pleistocene boundary.
Type section: cliff exposure at head of large landslide 1.8 km N. 10 deg. E. of Snake River bridge at Flagg Ranch on highway 3 km south of South Entrance of Yellowstone National Park, Teton Co., WY. Named from Huckleberry Ridge, a topographic crest just south of park boundary and north of Jackson Lake (Christiansen and Blank, 1972).
Central Montana uplift*
Central Western Overthrust*
Forest City basin*
Great Basin province*
Snake River basin*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).