↑Tull, J.F., Harris, A.G., Repetski, J.E., McKinney, F.K., Garrett, C.B. and Bearce, D.N., 1988. New paleontologic evidence constraining the age and paleotectonic setting of the Talladega slate belt, southern Appalachians.Geological Society of America Bulletin, 100(8), pp.1291-1299.