RT @USGS: Classic USGS Publication - [PUB] Physiography and Quaternary geology of the San Juan Mountains, Colorado (1932): https://t.co/ITx…
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RT @USGS: Classic USGS Publication - [PUB] Physiography and Quaternary geology of the San Juan Mountains, Colorado (1932): https://t.co/ITx…
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once lead a field trip out west that had a brief stop over at the Black Canyon of the Gunnison in the San Juans, really an incredible place with some great geology! https://t.co/f8Kph6aNq5
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RT @USGS: Classic USGS Publication - [PUB] Physiography and Quaternary geology of the San Juan Mountains, Colorado (1932): https://t.co/ITx…