Early Devonian, (Gedinnian), organic-walled microphytoplankton and spores from the Ross Formation of Tennessee, United States.
Reference:
Wood,G.D. et al. (1985)
Early Devonian, (Gedinnian), organic-walled microphytoplankton and spores from the Ross Formation of Tennessee, United States. American Association of Stratigraphic Palynologists,17th Annual Meeting,Program and Abstracts
Vol. 9 P. 260- 260