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26 October 2011
Strained Timiskaming-type metaconglomerates from Ontario
Why are these geologists all over these rocks? Because, gentle readers, these are some seriously cool rocks. The geologists are all participants on a pre-GSA-annual-meeting field trip to the Superior Craton, a chunk of ancient crust at the “nucleus” of the North American continent. The rocks are syn-tectonic volcaniclastic conglomerates of the Seine Group. They are Archean sediments very similar to modern day conglomerates – full of cobbles and pebbles …