Geology you can hold in your hand.
Evidence of Neoproterozoic glaciation overprinted by Appalachian mountain-building.
Other samples from the same site:
Selected locations showing truncated cross bed sets are labeled.
Proterozoic dike with big feldspars.
Obverse of the sample here:
An example courtesy of Allen Fraser, local geology expert.
To explore a gigapan of the roadcut where this sample was collected, click here:
Sample from Gettysburg Quarry, Gettysburg, PA.
Contributed by Gerald Elgert.
Sample courtesy of Ken Rasmussen and his colleague, the Baltimore-based archaeologist Henry Ward.
To explore a gigapan of two unconformities exposed at Loch Assynt, click here:
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