Valley and Ridge Igneous Intrusions; Peridotite (VAJTp;0)

State	Virginia
Name	Valley and Ridge Igneous Intrusions; Peridotite
Geologic age	Jurassic-Tertiary
Original map label	p
Comments	Appalachian Plateaus and Valley and Ridge. From expanded explanation (ref. VA002): Peridotite (Warren County, Rader and Biggs, 1976), chlorite, phlogopite, hydrobiotite pseudomorphs after olivine and pyroxene, pyrite, perovskite partly altered to leucoxene, apatite, dolomite, ilmenite, magnetite, epidote, and garnet. Kimberlite (Rockbridge County, Sears and Gilbert, 1973; Spencer, 1968), altered matrix montmorillonite, vermiculite, and chlorite; separated crystals Cr-rich spinel, clinopyroxene, garnet, ilmenite, rutile, anatase, zircon, and amphibole.
Primary rock type	peridotite
Secondary rock type	syenite
Other rock types
Lithologic constituents	Major Igneous > Plutonic > Ultramafic > PeridotiteDikes in Augusta and Rockingham Counties: nepheline syenite, teschenite-syenite, and teschenite-picrite.
Map references	Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/ [https://www.dmme.virginia.gov/commerce/]
Unit references	Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000 Digital Representation of the 1993 Geologic Map of Virginia - expanded explanation: 2003, Commonwealth of Virginia, Department of Mines, Minerals, and Energy, Divsion of Mineral Resources, Publication 147, 85 pp Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/ [https://www.dmme.virginia.gov/commerce/]
Geographic coverage	Rockbridge