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Dan River Group

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Dan River Group
Stratigraphic range: Late Triassic
Type Half graben rift basin; principle normal fault zone on the northwest basin margin. [1]
Unit of Newark Supergroup
Sub-units Stoneville Formation, Cow Branch Formation, Leaksville Formation, Dry Fork Formation, Walnut Cove Formation, Pine Hall Formation
Area126,300 acres
Thickness5,000-8,000 ft [1] [2]
Location
Region Virginia, North Carolina
Country United States
Type section
Named for Dan River
Named byThayer (1970)

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 (the Newark Supergroup) which together formed the Central Atlantic Magmatic Province (CAMP); an extremely large flood basalt eruption that occurred around 201 Ma. It preserves fossils dating back to the Triassic period. [3]

Contents

Formations

It contains six geological formations: [2]

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. [5]

See also

References

  1. 1 2 Reid, Jeffrey; Taylor, Kenneth (January 2013). "Mesozoic rift basins – Onshore North Carolina and southcentral Virginia, U.S.A.: Deep River and Dan River - Danville total petroleum systems (TPS) and assessment units (AU) for continuous gas accumulation". www.deq.nc.gov. North Carolina Geological Survey. Retrieved 22 October 2025.
  2. 1 2 3 Olsen, P. E.; Schlische, R. W; Gore, P. J. W. (1989). "GEOLOGY OF THE DAN RIVER-DANVILLE BASIN" (PDF). ldeo.columbia.edu. Field Guide to the Tectonics, stratigraphy, sedimentology, and paleontology of the Newark Supergroup, eastern North America. International Geological Congress. Archived (PDF) from the original on 2017-03-09. Retrieved 22 October 2025.
  3. ↑ Ghatak, A.; Basu, A. R. (December 2012). "Central Atlantic Magmatic Province (CAMP): The Palisade Sill Connection". AGU Fall Meeting Abstracts. pp. DI53A–2371. Retrieved 22 October 2025.
  4. 1 2 "Geolex — CowBranch publications". ngmdb.usgs.gov. GNU records (USGS DDS-6; Reston GNULEX). Retrieved 22 October 2025.
  5. ↑ Reid, Jeffery; Milici, Robert (8 November 2008). "Hydrocarbon Source Rocks in the Deep River and Dan River Triassic Basins, North Carolina" (PDF). pubs.usgs.gov. The USGS. Retrieved 22 October 2025.


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