Figure F58. Photomicrographs of hematitic sandy mudstone from Unit 4 (Sample 210-1276A-25R-6, 73-77 cm). The same view is shown in (A) plane-polarized light and (B) cross-polarized light. Pictured are large angular grains of quartz (Q) and feldspar (F) and a subrounded meta-sedimentary fragment (M). Sorting is poor, and the clay matrix is heavily pigmented by iron oxides. Note that in cross-polarized light both the quartz and the feldspar exhibit wavy or undulose extinction.

Figure F58. Photomicrographs of hematitic sandy mudstone from Unit 4 (Sample 210-1276A-25R-6, 73-77 cm). The same view is shown in (A) plane-polarized light and (B) cross-polarized light. Pictured are large angular grains of quartz (Q) and feldspar (F) and a subrounded meta-sedimentary fragment (M). Sorting is poor, and the clay matrix is heavily pigmented by iron oxides. Note that in cross-polarized light both the quartz and the feldspar exhibit wavy or undulose extinction.