U.S. Geological Survey Photographic Library

ID. Fries, C. 3

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Columnar basalt pavement in bottom of canyon just below dam at San Miguel Hegla. Hidalgo, Mexico. November 1949.

Columnar basalt pavement in bottom of canyon just below dam at San Miguel Hegla. Hidalgo, Mexico. November 1949.

Image file: /htmllib/btch423/btch423j/btch423z/fri00003.jpg