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Geologic Unit: Deep Run
Map showing publication footprint
  • Usage in publication:
    • Deep Run Granite
  • Modifications:
    • First used
  • Dominant lithology:
    • Granite
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Tollo, R.P., Lowe, T.K., Arav, Sara, and Gray, K.J., 1991, Geology of the Robertson River Igneous Suite, Blue Ridge province, Virginia, IN Schultz, Art, and Compton-Gooding, Ellen, eds., Geologic evolution of the eastern United States; Field trip guidebook NE-SE GSA 1991: Virginia Museum of Natural History Guidebook, Joint meeting of Geological Society of America, Northeastern Section and Southeastern Section, no. 2, p. 229-262.


Summary:

Tollo and Arav (in press) propose that Robertson River Formation of Allen (1963) be revised to Robertson River Igneous Suite to emphasize the lithologic diversity that characterizes this belt. Rocks range in composition from alkali syenite to alkali feldspar granite to granite. This suite is the largest group of intrusives within the Blue Ridge province of VA. Extends from near Upperville, 70 mi southwest to northern suburbs of Charlottesville. Includes at least nine mappable lithologic units, among them, Deep Run Granite, which is medium-grained, equigranular, and biotite-bearing. Exposures are poor and are limited to a restricted area within the southern segment of the Robertson River outcrop belt. Unit shown in contact with the Hitt Mountain Alkali Feldspar Syenite and Middle Proterozoic orthogneiss.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

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