The
Groveton Member of the
Bull Run Formation is exposed there.[1] The formation has produced disarticulated fish remains including isolated bones and scales.[1]
The large body of diabase in central
Montgomery County, Maryland, is known as the Boyds
Sill,[4] named after the town of
Boyds.
^Geologic history and stratigraphy of the Triassic-Jurassic Culpeper Basin, Virginia, R. C. Lindholm. GSA Bulletin (1979) 90 (11_Part_II): 1702–1736.
https://doi.org/10.1130/GSAB-P2-90-1702
^Fisher, G. W., 1964, The Triassic rocks of Montgomery County. In Geology of Howard and Montgomery Counties, Maryland Geological Survey, Baltimore, Maryland, 1964.)
References
Hunt, ReBecca K., Vincent L. Santucci and Jason Kenworthy. 2006. "A preliminary inventory of fossil fish from National Park Service units." in S.G. Lucas, J.A. Spielmann, P.M. Hester, J.P. Kenworthy, and V.L. Santucci (ed.s), Fossils from Federal Lands. New Mexico Museum of Natural History and Science Bulletin 34, pp. 63–69.