Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina

La Horqueta at Cardiel lake is a classical section in Santa Cruz province where marine invertebrates include ammonites of the Aptian-Albian transition. New collections at this site yielded palynological remains from several horizons in both Río Mayer Formation (latest Aptian) and Piedra Clavada Form...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Medina, F., Archangelsky, S., Guler, V., Archangelsky, A., Cárdenas, O.
Formato: JOUR
Materias:
Aptian-Albian boundary
Argentina
Biostratigraphy
Palynology
Patagonia
Bacteria (microorganisms)
Cheirolepidiaceae
Coniferophyta
Dinophyceae
Invertebrata
Magnoliophyta
Podocarpaceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15145158_v10_n2_p273_Medina
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15145158_v10_n2_p273_Medina
record_format dspace
spelling todo:paper_15145158_v10_n2_p273_Medina2023-10-03T16:19:33Z Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina Medina, F. Archangelsky, S. Guler, V. Archangelsky, A. Cárdenas, O. Aptian-Albian boundary Argentina Biostratigraphy Palynology Patagonia Bacteria (microorganisms) Cheirolepidiaceae Coniferophyta Dinophyceae Invertebrata Magnoliophyta Podocarpaceae La Horqueta at Cardiel lake is a classical section in Santa Cruz province where marine invertebrates include ammonites of the Aptian-Albian transition. New collections at this site yielded palynological remains from several horizons in both Río Mayer Formation (latest Aptian) and Piedra Clavada Formation (earliest Albian). Marine dinoflagellate cysts are found in the lower part of the section; they agree with an Aptian to earliest Albian age suggested by ammonites. Statistical counts of six palynological groups show the dominance of the conifer family Cheirolepidiaceae in the Río Mayer Formation coinciding with the presence of dinoflagellate cysts and the gradual increase of pteridophitic spores and saccate pollen, mainly of the family Podocarpaceae in the upper Piedra Clavada Formation. Angiosperm pollen is present throughout the section although it is more significant in the upper Piedra Clavada Formation where several new types have their first appearance (tricolpate, tricolporoidate and other types). Most palynological taxa are found across the whole section and many are known to occur in other units cropping out in this area, as the Baqueró Group (Early Aptian) or Kachaike Formation (Mid-Late Albian). Only few selected and probably significant species have been found to be of a possible biostratigraphic value and their distribution along the section is shown in a chart. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15145158_v10_n2_p273_Medina
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Aptian-Albian boundary
Argentina
Biostratigraphy
Palynology
Patagonia
Bacteria (microorganisms)
Cheirolepidiaceae
Coniferophyta
Dinophyceae
Invertebrata
Magnoliophyta
Podocarpaceae
spellingShingle Aptian-Albian boundary
Argentina
Biostratigraphy
Palynology
Patagonia
Bacteria (microorganisms)
Cheirolepidiaceae
Coniferophyta
Dinophyceae
Invertebrata
Magnoliophyta
Podocarpaceae
Medina, F.
Archangelsky, S.
Guler, V.
Archangelsky, A.
Cárdenas, O.
Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
topic_facet Aptian-Albian boundary
Argentina
Biostratigraphy
Palynology
Patagonia
Bacteria (microorganisms)
Cheirolepidiaceae
Coniferophyta
Dinophyceae
Invertebrata
Magnoliophyta
Podocarpaceae
description La Horqueta at Cardiel lake is a classical section in Santa Cruz province where marine invertebrates include ammonites of the Aptian-Albian transition. New collections at this site yielded palynological remains from several horizons in both Río Mayer Formation (latest Aptian) and Piedra Clavada Formation (earliest Albian). Marine dinoflagellate cysts are found in the lower part of the section; they agree with an Aptian to earliest Albian age suggested by ammonites. Statistical counts of six palynological groups show the dominance of the conifer family Cheirolepidiaceae in the Río Mayer Formation coinciding with the presence of dinoflagellate cysts and the gradual increase of pteridophitic spores and saccate pollen, mainly of the family Podocarpaceae in the upper Piedra Clavada Formation. Angiosperm pollen is present throughout the section although it is more significant in the upper Piedra Clavada Formation where several new types have their first appearance (tricolpate, tricolporoidate and other types). Most palynological taxa are found across the whole section and many are known to occur in other units cropping out in this area, as the Baqueró Group (Early Aptian) or Kachaike Formation (Mid-Late Albian). Only few selected and probably significant species have been found to be of a possible biostratigraphic value and their distribution along the section is shown in a chart.
format JOUR
author Medina, F.
Archangelsky, S.
Guler, V.
Archangelsky, A.
Cárdenas, O.
author_facet Medina, F.
Archangelsky, S.
Guler, V.
Archangelsky, A.
Cárdenas, O.
author_sort Medina, F.
title Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
title_short Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
title_full Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
title_fullStr Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
title_full_unstemmed Integrated biostratigraphical study of La Horqueta section (Aptian-Albian boundary), Cardiel lake, Patagonia, Argentina
title_sort integrated biostratigraphical study of la horqueta section (aptian-albian boundary), cardiel lake, patagonia, argentina
url http://hdl.handle.net/20.500.12110/paper_15145158_v10_n2_p273_Medina
work_keys_str_mv AT medinaf integratedbiostratigraphicalstudyoflahorquetasectionaptianalbianboundarycardiellakepatagoniaargentina
AT archangelskys integratedbiostratigraphicalstudyoflahorquetasectionaptianalbianboundarycardiellakepatagoniaargentina
AT gulerv integratedbiostratigraphicalstudyoflahorquetasectionaptianalbianboundarycardiellakepatagoniaargentina
AT archangelskya integratedbiostratigraphicalstudyoflahorquetasectionaptianalbianboundarycardiellakepatagoniaargentina
AT cardenaso integratedbiostratigraphicalstudyoflahorquetasectionaptianalbianboundarycardiellakepatagoniaargentina
_version_ 1807323253619818496

Ejemplares similares