Fine to coarse gravelly sand and sandy gravel, silt, and clay, light- to medium-gray and yellowish-gray. Deposited mainly in channel, point-bar, and flood-plain environments; includes sandy deposits of narrow estuarine beaches, and mud, muddy sand, and peat in swamps and in fresh- and brackish-water marshes bordering tidewater rivers. Grades into colluvium along steeper valley walls at margins of unit. Mostly Holocene but, locally, includes low-lying Pleistocene (?) terrace deposits. As much as 80 feet thick along major streams.
State Virginia
Name Alluvium
Geologic age Quaternary
Lithologic constituents
Unconsolidated (Alluvial)
Comments Coastal Plain (Holocene epoch per Karen Hostettler)

Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.

Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

NGMDB product
Counties Arlington - Caroline - Charles City - Chesterfield - Dinwiddie - Essex - Fairfax - Gloucester - Greensville - Hanover - Henrico - Isle of Wight - James City - King and Queen - King George - King William - Lancaster - Middlesex - New Kent - Prince George - Prince William - Richmond - Southampton - Spotsylvania - Stafford - Surry - Sussex - Westmoreland - York - Alexandria - Colonial Heights - Emporia - Franklin - Hopewell - Newport News - Richmond - Suffolk - Williamsburg