Figure F60. Sharp dike contact. A. Contact between a glassy dike margin and microcrystalline basalt (Unit 1256D-41) (interval 309-1256D-120R-1, 7–13 cm). B. Thin section detail of A (Thin Section 72; Sample 309-1256D-120R-1, 10–12 cm) (field of view = 2.5 mm; plane-polarized light).
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