Geologic Unit: Blue Gap

Usage:

Blue Gap Member of Fort Union Formation (CO*,WY*)

Geologic age:

Paleocene, early

Type section, locality, area and/or origin of name:

Type section (upper part): beginning about 550 ft from south line and 1,850 ft from east line, and ending about 250 ft from south line and 2,600 ft from east line, in sec. 10, T. 13 N., R. 91 W., Dixon 7.5-min quadrangle, Carbon Co., southernmost WY. Named from Blue Gap Draw, in sec. 24, T. 15 N., R. 92 W., Blue Gap 7.5-minute quadrangle, Carbon Co., southernmost WY (Honey and Hettinger, 2004).
Type area: prominent exposures showing typical claystone lithology, visible from WY State Highway 789, on east bank of Muddy Creek, 1.5 mi southeast of southeast corner of Peach Orchard Flat 7.5-min quadrangle, in NE/4 sec. 15 and SE/4 sec. 10, T. 13 N., R. 91 W., Dixon 7.5-min quadrangle, Carbon Co., southernmost WY (Honey and Hettinger, 2004).

AAPG geologic province:

Green River basin