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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. © 2014 AASP - The Palynological Society.

Registro:

Documento: Artículo
Título:Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities
Autor:Amenábar, C.R.; Candel, M.S.; Guerstein, G.R.
Filiación:Instituto Antártico Argentino, Balcarce 290, Buenos Aires, Argentina
Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires, Departamento de Ciencias Geológicas, Intendente Güiraldes 2160, Buenos Aires, Argentina
Instituto Geológico Del sur, Departamento de Geología, Universidad Nacional Del sur, San Juan 670, Bahía Blanca, Argentina
Palabras clave:Antarctica; Argentina; dinoflagellate cysts; Late CretaceousHolocene; modern analogues; palaeoenvironment; biostratigraphy; Cretaceous; dinoflagellate cyst; Holocene; ice cover; micropaleontology; paleoenvironment; palynology; palynomorph; sea ice; Antarctica; Argentina; Dinophyceae
Año:2014
Volumen:38
Número:2
Página de inicio:303
Página de fin:323
DOI: http://dx.doi.org/10.1080/01916122.2014.907829
Título revista:Palynology
Título revista abreviado:Palynology
ISSN:01916122
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01916122_v38_n2_p303_Amenabar

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Citas:

---------- APA ----------
Amenábar, C.R., Candel, M.S. & Guerstein, G.R. (2014) . Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities. Palynology, 38(2), 303-323.
http://dx.doi.org/10.1080/01916122.2014.907829
---------- CHICAGO ----------
Amenábar, C.R., Candel, M.S., Guerstein, G.R. "Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities" . Palynology 38, no. 2 (2014) : 303-323.
http://dx.doi.org/10.1080/01916122.2014.907829
---------- MLA ----------
Amenábar, C.R., Candel, M.S., Guerstein, G.R. "Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities" . Palynology, vol. 38, no. 2, 2014, pp. 303-323.
http://dx.doi.org/10.1080/01916122.2014.907829
---------- VANCOUVER ----------
Amenábar, C.R., Candel, M.S., Guerstein, G.R. Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities. Palynology. 2014;38(2):303-323.
http://dx.doi.org/10.1080/01916122.2014.907829