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It looks to me like the Piedras Encimadas are basaltic-rhyolite intrusions into older volcanic ash beds, so they formed in pretty much their present shape in the first place and then were revealed by erosion. But maybe I am wrong? Maybe they are remnants of much more extensive rhyolite beds and they were shaped by erosion? Are there good sources to say which it was? Colin McLarty (talk) 15:09, 1 December 2014 (UTC)[reply]
