Figure F61. Photomicrograph of an apparently spherulitic unit, showing spherical domains in a cristobalite-clay matrix (interval 193-1188F-6Z-1, 45-47 cm, Unit 31, in plane-polarized light; width of view = 5.5 mm. Photomicrograph ID# 1188F

Figure F61. Photomicrograph of an apparently spherulitic unit, showing spherical domains in a cristobalite-clay matrix (interval 193-1188F-6Z-1, 45-47 cm, Unit 31, in plane-polarized light; width of view = 5.5 mm. Photomicrograph ID# 1188F_16; thin section 67).