Windsor Formation (VAQTw;0)

State	Virginia
Name	Windsor Formation
Geologic age	Tertiary-Quaternary
Original map label	QTw
Comments	Coastal Plain From expanded explanation (ref. VA002): Windsor Formation (lower Pleistocene or upper Pliocene, Coch, 1968). Gray and yellowish- to reddish-brown sand, gravel, silt, and clay. Constitutes surficial deposits of extensive plain (altitude 85-95 feet.) seaward of Surry scarp and of coeval, fluvial-estuarine terraces west of scarp. Fining upward sequence beneath plain consists of a basal pebbly sand grading upward into cross-bedded, quartzose sand and massive, clayey silt and silty clay; lower and upper parts of sequence were deposited, respectively, in shallow-marine or open-bay and restricted-bay or lagoonal environments. In terraces west of Surry scarp, fluvial-estuarine deposits comprise muddy, coarse, trough cross-bedded sand and gravel grading upward to sandy silt and clay. Thickness is 0 to 40 feet.
Primary rock type	gravel
Secondary rock type	sand
Other rock types	silt; clay or mud
Lithologic constituents	Minor Unconsolidated > Fine-detrital > Clay Unconsolidated > Fine-detrital > Silt Unconsolidated > Coarse-detrital > Sand Unconsolidated > Coarse-detrital > Gravel
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	Caroline - Charles City - Chesterfield - Dinwiddie - Essex - Fairfax - Gloucester - Greensville - Hanover - Henrico - Isle of Wight - James City - King and Queen - King George - King William - Lancaster - Mathews - Middlesex - Northumberland - Prince George - Prince William - Richmond - Southampton - Spotsylvania - Stafford - Surry - Sussex - Westmoreland - York - Colonial Heights - Emporia - Franklin - Fredericksburg - Hopewell - Newport News - Petersburg - Richmond - Suffolk - Williamsburg