Figure F101. Photomicrograph of sandy siltstone from Subunit 5C viewed at high magnification (Sample 210-1276A-80R-3, 70-73 cm). Sand-sized microporous piece of plant matter (P) is surrounded by quartz (white grains) and biotite (b) set in a tan micritic matrix.

Figure F101. Photomicrograph of sandy siltstone from Subunit 5C viewed at high magnification (Sample 210-1276A-80R-3, 70-73 cm). Sand-sized microporous piece of plant matter (P) is surrounded by quartz (white grains) and biotite (b) set in a tan micritic matrix.