Plate 3. Photomicrographs. 1. Planar-wavy lamina with clastic texture (lower part of picture) is overlain by dark, matrix-rich lamina with detrital gypsum. Lenticular crystals are present in both laminae. Section 161-975B-33X-CC, 15-19 cm. Scale bar is 0.

Plate 3. Photomicrographs. 3. Large intercrystalline pores in coarsely crystalline gypsum pinch-and-swell structure. Section 975B-34X-1, 26-30 cm. Scale bar is 0.1 mm.