Hutton's classic unconformity (Devonian red beds over Silurian graywacke and shale).
At the Caves of Cushendun, an arkosic conglomerate can be found.
Rutile needles exsolved on the surface of a biotite grain from the Devonian-aged Tioga bentonite exposed in Seven Fountains, VA.
Sample provided by Dr. Dan Doctor, US Geological Survey.
Chaneysville member of the Devonian-aged Mahantango Formation, exposed near Hayfield, Virginia.
Mahantango Formation, Trinity Church site, Fort Valley, Virginia.
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