Lower Devonian and Silurian Formations Undivided (VADSz;0)

State	Virginia
Name	Lower Devonian and Silurian Formations Undivided
Geologic age	Silurian-Devonian
Original map label	DSz
Comments	Undivided; Appalachian Plateaus and Valley and Ridge
Primary rock type	sandstone
Secondary rock type	limestone
Other rock types	shale
Lithologic constituents
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", 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	Alleghany - Augusta - Bland - Botetourt - Craig - Frederick - Giles - Lee - Montgomery - Pulaski - Roanoke - Rockbridge - Rockingham - Scott - Shenandoah - Smyth - Tazewell - Wythe - Radford