The contact zone described in this paper is situated some 10 miles south of the town of Neihart in the Little Belt Mountains of central Montana. The material examined was collected during the summer of 1933 by Professor E. S. Larsen, Jr., from a cutting on the new White Sulphur Springs-Neihart automobile road. From Weed and Pirsson's account of the area (1)1 it seems almost certain that the intruded limestone of the contact zone is a member of the Cambrian Barker formation while the igneous rock is probably one of the small bodies mapped as “diabase, basalt, minette, vogesite or kersantite.”

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