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23 November 2010

How many structures can you see here?

Last summer, in Bonner, Montana on my Rockies field course, I took the students to see some nice exposures of Belt Supergroup strata on the side of the road. We were keeping our eyes peeled for both primary structures (i.e., patterns in the sediment that formed at the time of their deposition) and secondary, or tectonic, structures (i.e., those that formed as a result of the rock being strained under …


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