Usage:
Blackhawk Formation of Mesaverde Group (UT*)
Blackhawk Formation (UT)
Subunits:
(alphabetical): Aberdeen Sandstone Member (UT), Desert Member (UT), Grassy Member (UT), Kenilworth Member (UT*), /Spring Canyon Member (UT), Sunnyside Member (UT*).
Geologic age:
Late Cretaceous (Campanian)*
Type section, locality, area and/or origin of name:
Named from prominent exposures near Blackhawk, a mining community on eastern front of Wasatch Plateau, central eastern UT (Spieker and Reeside, 1925).
[Blackhawk Mine at Lat. 39 deg. 28 min. 09 sec. N., Long. 111 deg. 01 min. 06 sec. W., Hiawatha 7.5-min quadrangle, northernmost Emery Co., UT.]
AAPG geologic province:
Paradox basin*
Uinta 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 ([ ]).