Geologic Unit: Lava Creek
Lava Creek Tuff of Yellowstone Group (ID*,MT*,WY*)
Lava Creek Tuff (CO)
Lava Creek ash (informal) (CA*,CO*,ID*,IA*,KS*,MT*,NE*,NV*,NM*,OK*,SD*,TX*,UT*,WY*)
For informal usage, the rank or lithologic term should not be capitalized.
Type area: Upper Canyon of Lava Creek, and its tributary, Arrow Canyon, in Yellowstone National Park, Park Co., WY. Named from Lava Creek (Christiansen and Blank, 1972).
Principal reference sections: (1) lower informal member in south-facing cliff of Purple Mountain, above old gravel pit, about 1 km east of Madison Junction; (2) upper informal member in east wall of Sheepeater Canyon, Garder River, 1 km northeast of Osprey Falls (Christiansen and Blank, 1972).
Unit Name History:
Name proposed for the upper formation of Yellowstone Group; Isotopic dating (Christiansen and Blank, 1972).
Overview (Naeser and others, 1973).
Areal limits of informally designated Lava Creek A and Lava Creek B ashes (Izett and Wilcox, 1982).
Areal limits, Lava Creek B identified in San Juan basin (Dethier and others, 1990).
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Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().
Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).
U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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Last modified: 15-Jan-2013