Abstract
One fossil impression of an adult diopsid fly was discovered from shale deposits of the Ruby River Basin of southwestern Montana. The specimen (RR 6-390) was discovered in the well-known fossil basin area between Peterson and Mormon Creeks (site no. 6, T. 7 S, R.5 W, Sec. 23 Madison County, Mont.), 13 miles south of the town of Alder, Mont. This preservation, as far as known, is the 1st fossil diopsid to be recorded from the North American continent.
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