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Small Antarctic Late Cretaceous chorate dinoflagellate cysts; biological and palaeoenvironmental affinities

Cecilia R. Amenabar, Maria Soledad Candel and G. Raquel Guerstein
Small Antarctic Late Cretaceous chorate dinoflagellate cysts; biological and palaeoenvironmental affinities
Palynology (December 2014) 38 (2): 303-323

Abstract

Small spiny marine palynomorphs have been the focus of recent palynological studies since their high proportions in Antarctic Late Cretaceous and Cenozoic assemblages were noted. These palynomorphs were assigned to the dinoflagellate cyst Impletosphaeridium clavus and they were believed to have had an affinity with some modern round brown spiny cysts (RBSCs). Our study aims to analyse there together with potential modern analogues by comparing Late Cretaceous and Cenozoic Antarctic specimens with some RBSCs recorded from the Holocene of southern Argentina. We confirm several features in common between these specimens, although differences in processes and the cyst wall are observed. The species could have been produced by dinoflagellates similar to those that generate some RBSCs. Their abundance in the Late Cretaceous may have occurred in response to short term cooling pulses without development of sea-ice cover. Cenozoic records are considered to be reworked, restricting the stratigraphical range of Impletosphaeridium clavus.


ISSN: 0191-6122
EISSN: 1558-9188
Serial Title: Palynology
Serial Volume: 38
Serial Issue: 2
Title: Small Antarctic Late Cretaceous chorate dinoflagellate cysts; biological and palaeoenvironmental affinities
Affiliation: Instituto Antartico Argentino, Buenos Aires, Argentina
Pages: 303-323
Published: 201412
Text Language: English
Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States
References: 61
Accession Number: 2014-097241
Categories: Paleobotany
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 3 plates, 1 table, geol. sketch map
S54°52'60" - S54°52'60", W68°40'00" - W67°00'00"
S64°27'00" - S63°53'60", W57°37'00" - W57°10'60"
Secondary Affiliation: Universidad Nacional del Sur, ARG, Argentina
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201449
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