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Thin section of a rich oil shale bed from asphalt tunnel. Garfield County, Colorado. Thin section of a rich oil shale bed from asphalt tunnel, sec. 1, T. 7 S., R. 98 W., showing figured organic material embedded in a structure less groundmass. This photomicrograph shows the spines of insect larvae, probably a species of Oestridae still arranged in tiers. It also shows part of larval skins (the large black areas) and fragments of the eyes and wings of minute adult insects. C.A. Davis thin section was made prior to 1916: enlarged 110 times. Garfield County, Colorado. Plate 18, U.S. Geological Survey. Professional paper 168. 1931. Categories: Image; Tags: Bradley, W.H. Collection, Garfield County, Colorado, Photographers, photo print