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Cambrian-aged Harpers Formation meta-mudstone exposed on the property of Arlington, Virginia's outdoor education facility, the Phoebe Hall Knipling Outdoor Lab.
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A piece of float from the talus slope below a cliff of the Gordon Lake Formation, near White River Lodge, Ontario, Canada. Illustrates a number of sedimentary depositional features including rip-up mudclasts and mudcracks.
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Carbonate mudstone with calcitic dropstone from the lower member of the Ghaub Formation in Namibia. This rock records the onset of Marinoan glaciation, represented by dropstones in the Ghaub Formation. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard U...
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