Mount Rogers Formation - Conglomerate, graywacke, laminated siltstone, and shale. (VAZml;0)

State	Virginia
Name	Mount Rogers Formation - Conglomerate, graywacke, laminated siltstone, and shale.
Geologic age	Proterozoic Z
Original map label	Zml
Comments	In Grayson, Washington, and Smyth Counties only; Blue Ridge Anticlinorium, Southwest. From expanded explanation (ref. VA002): Graywacke conglomerate, graywacke, tuffaceous sandstone, laminated siltstone, shale, and minor greenstone and rhyolite. Most of the sedimentary rocks are volcanigenic but contain a significant detrital contribution from the underlying crystalline rocks of the Grenville-age basement.
Primary rock type	conglomerate
Secondary rock type	graywacke
Other rock types	siltstone; shale; greenstone; rhyolite
Lithologic constituents	Incidental Metamorphic > Metaigneous > Greenstone Igneous > Volcanic > Felsic-volcanic > Rhyolite
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	Grayson - Washington