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DINOFLAGELLATE CYSTS OF EOCENE STRATA Plate 1. 1,2 Thalassiphora aff. T. pelagica; 3 Pentadinium favatum; 4 Pentadinium goniferum; 5 Glaphyrocysta semitecta; 6 Hystrichokolpoma rigaudiae; 7 Spiniferites pseudofurcatus; 8 Wetzeliella meckelfeldensis; 9 Glaphyrocysta Vicina; 10 Glaphyrocysta exub e r- ans; 11, 12 Wetzeliella articulata; 13 Glaphyrocysta microfenestrata; 14, 16 Charlesdowniae variabilis; 15 Wilsonidium tabulatum ; 17, 18 Samlandia chlamydophora. 65
JOYCE LUCAS-CLARK Dry Branch units are from the Griffins Landing member of the Dry Branch. These assemblages are characterized by coleothrighypta, C. variabliis, Glaphyrocysta microfenestrata, and Samlandia chlamydophora. Edwards (1990) reported the occurrence of some of the species herein illustrated, and her reports are consistent with my findings. In general, the ranges of these dinoflagellate species at Savannah River Site are consistent with those reported in the literature. Some exceptions are that Spiniferites pseudofurcatus is sometimes considered to have its first occurrence in the Eocene (e.g. Williams and Bujak, 1985), but it has been reported in unpublished literature from the Gulf and Atlantic Coastal Plains from the late Paleocene (e.g. McLean, 1971). Hystrichokolpoma rigaudiae has its base, worldwide, in older, lower Eocene rocks, but I have not found it in the Fishburne. As far as I know, the only other recorded occurrence of C. variabilis is in the late middle Eocene Barton beds of England, whereas I have found it in the upper Eocene Dry Branch. REFERENCES Edwards, L.E., 1990. Dinocysts from the lower Tertiary units in the Savannah River area, South Carolina and Georgia, in Zullo, V.A., W.B. Harris, and V. Price eds. Savannah River Region: Transition Between the Gulf and Atlantic Coastal Plains, Proceedings of the second Bald Head Island Conference on Coastal Plains Geology, p. 97-99. Fallaw, W.C., V. Price, and P.A. Thayer, 1990. Stratigraphy of the Savannah River Site, South Carolina, in Zullo, V.A., W.B. Harris, and V. Price eds. Savannah River Region: Transition Between the Gulf and Atlantic Coastal Plains, Proceedings of the second Bald Head Island Conference on Coastal Plains Geology, p. 29-31. Harris, W.B., and V.A. Zullo, 1990. Sequence Stratigraphy of Paleocene an Eocene deposits in the Savannah River Region in Zullo, V.A., W.B. Harris, and V. Price eds. Savannah River Region: Transition Between the Gulf and Atlantic Coastal Plains, Proceedings of the second Bald Head Island Conference on Coastal Plains Geology, p. 134-142. McLean D.M., 1971. Organic-walled Phytoplankton from the lower Tertiary Pamunkey Group of Virginia and Maryland [Ph.D. dissertation]: Stanford University, 165 p. Prowell, D.C., R.C. Christopher, L.E. Edwards, and H.E. Gill, 1985. Geologic section of the updip Coastal Plain from central Georgia to western South Carolina. U.S. Geological Survey Map MF-1737. Siple, G.E., 1967. Geology and ground water of the Savannah River Plant and vicinity, South Carolina. U.S. Geological Survey Water Supply Paper 1841, 113 p. Williams, G.L. and J.P. Bujak, 1985. Mesozoic and Cenozoic dinoflagellates, in Bolli, H.M., J.B. Saunders, and K. Perch- Neilsen eds. Plankton Stratigraphy, Cambridge, Cambridge University Press. P. 847-964. 66
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