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Comments on Gigapan: Snowball Earth Educational Rock Sample Suite PFH-2

  2. Seafloor barite in cap dolostone in upper Ravensthroat Formation from northwest Canada. Sample is 50 mm across at its widest point and 15 mm across at its narrowest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, H...

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