Edward L. Simpson, Frederick A. Sundberg; Early Cambrian age for synrift deposits of the Chilhowee Group of southwestern Virginia. Geology ; 15 (2): 123–126. doi: https://doi.org/10.1130/0091-7613(1987)15<123:ECAFSD>2.0.CO;2
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A newly discovered shelly fossil (hyolithid?) and trace fossil (Rusophycus) were found within synrift and postrift sediments of the Chilhowee Group in southwestern Virginia. These specimens indicate that the Chilhowee Group may be entirely of Cambrian age and that rifting in the central and southern Appalachians extended into the Early Cambrian.