Dan River Group

The Dan River Group is a geologic group in Virginia and North Carolina associated with the initial rifting of the supercontinent Pangea. It is located on the southern end of a much larger rift valley sequence which together formed the Central Atlantic Magmatic Province ; an extremely large flood basalt eruption that occurred around 201 Ma. It preserves fossils dating back to the Triassic period.

Formations

It contains six geological formations:

Stoneville Formation. Sedimentary layer around 600 ft.
Leaksville Formation
Cow Branch Formation. Sedimentary thickness is around 545 ft.
Dry Fork Formation
Walnut Cove Formation
Pine Hall Formation. It's thickness ranges between 524-2,000 feet in depth.

Volcanism

While the exact extent of lava erupted in the Dan River formation is not known, there is evidence of diabase dikes/sills found here. These magma bodies heated the ground around them, causing sedimentary rocks and coal to alter; a process known as contact metamophisis. The extent and volume of magma is unknown due to no exposed dikes or sills at the surface.