Image:OilShaleMicro.jpg

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Photomicrograph showing detail of the varves in the rich oil shale specimen in Bradley photo 321; the organic laminae indicated by marks are themselves finely laminated. The mineral laminae contain considerable organic matter, but they are readily distinguished by their coarser grain and greater thickness. Enlarged 320 diameters. Garfield County, Colorado. 1927. Plate14-A in U.S. Geological Survey. Professional paper 158. 1930.

Image file: http://libraryphoto.cr.usgs.gov/htmllib/btch271/btch271j/btch271z/btch271/bwh00323.jpg

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