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Figure F9.
Photomicrograph in
plane-polarized light of Sample 187-1155B-6R-3, 135-138 cm (see "Site
1155 Thin Sections"), showing a quench zone grading from fresh
glass to spherulitic glass to coalesced spherulites. Notice the flow-aligned
acicular plagioclase on which some spherulites have nucleated. The tan-brown
transition at the first appearance of spherulites is due to the palagonitization
of the glass.
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