Usage:
Dad Sandstone Member of Lewis Shale (WY*)
Geologic age:
Late Cretaceous (Maastrichtian)*
Type section, locality, area and/or origin of name:
Typical development (subsurface): depth-interval 6,385 to 7,805 ft, Union Texas Gas Company Dad Unit No. 2 well, in sec. 13, T. 16 N., R. 93 W., [approx. Lat. 41 deg. 21 min. 30 sec. N., Long. 107 deg. 48 min. 42.3 sec. W., Mexican Flats 7.5-min quadrangle], Carbon Co., southern WY. [Town of Dad at Lat. 41 deg. 19 min. 34 sec. N., Long. 107 deg. 45 min. 30 sec. W.] (Hale, 1961).
Principal reference section: in NW/4 NE/4 SW/4 sec. 28, T. 15 N., R. 91 W., [approx. Lat. 41 deg. 14 min. 36.4 sec. N., Long. 107 deg. 38 min. 26.4 sec., Peach Orchard Flat 7.5-min quadrangle], Carbon Co., southern WY, where 585 ft were measured (Gill and others, 1970).
Reference section: in SW/4 SW/4 sec. 13 and SE/4 SE/4 sec. 14, T. 22 N., R. 89 W., [in vicinity of Lat. 41 deg. 52 min. 22 sec. N., Long. 107 deg. 24 min. 31 sec. W., Rawlins Peak SW 7.5-min quadrangle], Carbon Co., southern WY (Gill and others, 1970).
AAPG geologic province:
Green River 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 ([ ]).