Figure F33. Photomicrograph of Sample 183-1137A-45R-1 (Piece 1, 80-84 cm) showing a constriction through which sediment has flowed into flow-top breccia of basement Unit 10. The sandy silt is either internally massive or it has fine silt distributed around and between clasts, with coarser sand concentrated in stringers or domains of aligned particles farther from clasts. Field of view = 2.75 mm (plane-polarized light).