Figure F14. Photomicrographs of silt grains with isopachous rims of oriented clay. A. Cross-polarized light. Arrows = birefringent clay rims, circles = smaller silt particles with clay rims that are slightly out of the plane of focus. B. Gypsum plate (cross-polarized light). Strong orientation of the grain-rimming clays is indicated by blue and yellow regions of the rims.
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