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pubs.usgs.gov · Las Tetas lava member. They are abundantly porphyritic, and the generally very finely crystalline groundmass is dark greenish gray in most exposures.

Oct 05, 2018

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Page 1: pubs.usgs.gov · Las Tetas lava member. They are abundantly porphyritic, and the generally very finely crystalline groundmass is dark greenish gray in most exposures.