Photograph of nodular anhydrite (dark gray) in Grayburg-
San Andres dolomite. Light-colored material between anhydrite
nodules is clayey carbonate; tan material above nodules is

slightly oil-stained dolomite. Core from 2,780 ft (847 m)
depth in the McElroy field, eastern margin of the Central
Basin Platform, Crane Co., Texas.

© Peter A. Scholle, 1999

Guadalupe Mtns. geology —— Scholle home page —— NM Bureau staff page —— NM Bureau main page