Abstract

Pennsylvanian sediments in northeastern Socorro County, New Mexico, in order of abundance, consist of shales, limestones, and sandstones and attain a thickness of about 740 feet. Insoluble residues, organic remains, and thin sections were utilized to determine characteristics of sediments, metasomatic changes, and environment of deposition. Metasomatic changes include: calcification, aragonite (?) to calcite; dolomitization, calcite to dolomite; silicification, calcite and dolomite to chalcedony; and alteration of undetermined minerals to illite. Sedimentation, in a relatively unstable, shallow geosyncline, was influenced by four positive areas of low to medium relief.

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