Abstract
Surface exposures in the walls of Rocky Arroyo and adjacent canyons, 12 miles northwest of Carlsbad, New Mexico, reveal an abrupt lateral change in lithology in the Seven Rivers formation. A 275-foot section of gypsum with thin beds of dolomitic limestone merges into a thinner section of uniform dolomitic limestone with some sandstone beds. Evidence is presented to show that this change is the result of interfingering of gypsum and dolomitic limestone rather than of transgressional overlap of limestone on gypsum, as has previously been suggested. The abrupt lateral gradation is thought to have been produced by the close juxtaposition of differing sedimentary environments in Seven Rivers time.
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