A Proterozoic Wrinkle in Time

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Polished rock slab of Proterozoic Macaubas Group (metadiamictite), Minas Gerais State, Brazil: Large diamictite clast, stretched clasts, and pressure shadows. Igneous, Metamorphic, or Sedimentary? Yes! This "virtual field trip" rock slab is used for teaching many concepts in introductory to advanced geology classes at the University of Utah.

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