Figure F9. Photomicrographs of chert clasts. A. Structureless microcrystalline quartz. B. Radiolarian chert (plane-polarized light). C. Same as B (cross-polarized light). D. Spiculite (plane-polarized light). E. Same as D (cross-polarized light). F. Veined chert (plane-polarized light). G. Same as F (cross-polarized light).
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