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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but it has been reported in unpublished literature from the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.
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