Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities
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...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01916122_v38_n2_p303_Amenabar http://hdl.handle.net/20.500.12110/paper_01916122_v38_n2_p303_Amenabar |
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paper:paper_01916122_v38_n2_p303_Amenabar2023-06-08T15:19:51Z Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities 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 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. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01916122_v38_n2_p303_Amenabar http://hdl.handle.net/20.500.12110/paper_01916122_v38_n2_p303_Amenabar |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| topic_facet |
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 |
| description |
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. |
| title |
Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| title_short |
Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| title_full |
Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| title_fullStr |
Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| title_full_unstemmed |
Small Antarctic Late Cretaceous chorate dinoflagellate cysts: Biological and palaeoenvironmental affinities |
| title_sort |
small antarctic late cretaceous chorate dinoflagellate cysts: biological and palaeoenvironmental affinities |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01916122_v38_n2_p303_Amenabar http://hdl.handle.net/20.500.12110/paper_01916122_v38_n2_p303_Amenabar |
| _version_ |
1768542360397938688 |