Newark Supergroup; Triassic Sandstone, Siltstone, and Shale

Sandstone, very fine- to coarse-grained, reddish-brown to gray, micaceous, minor conglomerate beds. Siltstone, reddish-brown to gray, micaceous. Shale, reddish-brown, greenish-gray, gray, yellowish-brown, laminated, fossiliferous. Upward-fining sequences, discontinuous vertically and horizontally.
State Virginia
Name Newark Supergroup; Triassic Sandstone, Siltstone, and Shale
Geologic age Upper Triassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Sandstone
Comments Mesozoic Basins; paper map and digital map have differernt labels: paper map does not have TR prefix, but the digital source has TR as part of the label.
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 Albemarle - Amelia - Buckingham - Campbell - Caroline - Charlotte - Chesterfield - Culpeper - Cumberland - Dinwiddie - Fairfax - Fauquier - Goochland - Halifax - Hanover - Henrico - Henry - Loudoun - Nelson - Orange - Pittsylvania - Powhatan - Prince Edward - Prince William - Manassas - Manassas Park