Geology you can hold in your hand.
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:
Collected on the northeast side of Ronas Hill adjacent to a Devonian dike.
Obverse of this sample:
Collected from a dike on the east side of Ronas Hill.
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