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Newark Supergroup; Triassic shale and siltstone

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Shale, light-greenish gray, light- to dark-gray, carbonaceous, and reddish-brown in cyclic sequences, laminated, silty to sandy, fossiliferous. Siltstone, typically reddish-brown to gray, sandy, micaceous, with minor fine-grained sandstone beds.
State Virginia
Name Newark Supergroup; Triassic shale and siltstone
Geologic age Triassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Siltstone
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 Campbell - Culpeper - Fairfax - Fauquier - Halifax - Loudoun - Madison - Orange - Pittsylvania - Prince William - Manassas