Figure F7. A, B. Thin section photomicrographs of moderately olivine-augite-phyric microgabbro from Unit I (Sample 330-U1375B-1R-1W, 1–3 cm; Thin Section 227): (A) plane-polarized light, (B) crossed polars. C, D. Close-up of moderately porphyritic intergranular holocrystalline texture (Sample 330-U1375B-1R-1W, 56–57 cm; Thin Section 228): (C) plane-polarized light, (D) crossed polars. Groundmass texture is characterized by tabular plagioclase with anhedral crystals of augite in the interstices.
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