Figure F100. Photomicrographs of sandy siltstone in Subunit 5C under (A) plane-polarized light and (B) in cross-polarized light. Components are dominantly white angular quartz grains, biotite flakes (b), muscovite flakes (m and brightly birefringent grain), green glauconite, phyllite fragments (S), and an echinoid spine (E). These grains are surrounded by microcrystalline carbonate cement (Sample 210-1276A-81R-3, 64-67 cm).

Figure F100. Photomicrographs of sandy siltstone in Subunit 5C under (A) plane-polarized light and (B) in cross-polarized light. Components are dominantly white angular quartz grains, biotite flakes (b), muscovite flakes (m and brightly birefringent grain), green glauconite, phyllite fragments (S), and an echinoid spine (E). These grains are surrounded by microcrystalline carbonate cement (Sample 210-1276A-81R-3, 64-67 cm).