Bacons Castle Formation

Tb1/Tb2 Bacons Castle Formation (upper Pliocene, Coch, 1965). Gray, yellowish-orange, and reddish-brown sand, gravel, silt, and clay; constitutes surficial deposits of high plain extending from Richmond, eastward to the Surry scarp. Unit is subdivided into two members: Tb1, massive to thick-bedded pebble and cobble gravel grading upward into cross-bedded, pebbly sand and sandy and clayey silt, and Tb2, predominantly thin-bedded and laminated clayey silt and silty fine-grained sand. Tb2 is characterized by flaser, wavy, and lenticular bedding and rare to common clay-lined burrows including Ophiomorpha nodosa. Thickness is 0 to 70 feet.
State Virginia
Name Bacons Castle Formation
Geologic age Tertiary
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Gravel
Minor
Unconsolidated > Fine-detrital > Silt
Unconsolidated > Coarse-detrital > Sand
Incidental
Unconsolidated > Fine-detrital > Clay
Comments Coastal Plain
References

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 - Greensville - Hanover - Henrico - King George - New Kent - Prince George - Richmond - Southampton - Spotsylvania - Stafford - Surry - Sussex - Westmoreland - Alexandria - Emporia - Petersburg - Richmond