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Mid- to Late Eocene organic-walled dinoflagellate cysts from ODP Leg 171B, offshore Florida

By
Caroline A. Van Mourik
Caroline A. Van Mourik
Department of Geology and Geochemistry, Stockholm University, S-106 91 Stockholm,Sweden (Caroline.vanMourik@geo.su.se)
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Henk Brinkhuis
Henk Brinkhuis
Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestlaan 4, NL-3584, CD Utrecht,The Netherlands
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Graham L. Williams
Graham L. Williams
Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography,P. O. Box 1006, Dartmouth, N. S., Canada B2Y 4A2
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Published:
January 01, 2001

Abstract

The well-calibrated mid- to late Eocene sediment record of ODP Leg 171B (Site 1053A, Blake Nose) allows a detailed stratigraphic and palaeoenvironmental analysis of the dinoflagellate cyst (dinocyst) content. The recovered assemblages are a mixture of inner neritic, outer neritic and oceanic species. The autochthonous dinoflagellates, principally those of the Impagidinium group, indicate an oceanic milieu, with possibly some shallowing of water depth towards the top of the section. This trend is also indicated by a corresponding increase of inner neritic dinocysts. The close agreement in the abundance peaks of inner neritic dinocysts and terrestrial palynomorphs indicats that both are allochthonous. This is confirmed by the much higher number of neritic species found in JOIDES Holes 1 and 2, on the continental shelf of eastern Florida, immediately to the west of the Blake Nose. Lower-latitude species found in Hole 1053A, but not occurring at higher latitudes during late Eocene time, are Diphyes colligerum and Thalassiphora delicata. The presence of these, and other lower-latitude species, confirms that warmer-water conditions persisted during mid- to early late Eocene time in the vicinity of Site 1053. Eighteen new taxa are described, two of them formally: Charlesdowniea proserpina sp. nov. and Oligosphaeridium anapetum sp. nov.

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Contents

Geological Society, London, Special Publications

Western North Atlantic Palaeogene and Cretaceous Palaeoceanography

Dick Kroon
Dick Kroon
University of Edinburgh, UK
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R. D. Norris
R. D. Norris
Woods Hole OI, USA
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A. Klaus
A. Klaus
Ocean Drilling Program, USA
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Geological Society of London
Volume
183
ISBN electronic:
9781862394315
Publication date:
January 01, 2001

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