First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera

The finding of palynological remains in the lower member of the Cerro Morado Formation is reported for the first time. The fossiliferous levels are located at the headwaters of the Guandacol river in southwestern La Rioja Province. In this area the Cerro Morado Formation has been divided into two me...

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Autores principales: Barreda, V., Limarino, C., Fauqué, L., Tripaldi, A., Net, L.
Formato: JOUR
Materias:
Cerro Morado Formation
La Rioja Province
Miocene
Palynology
Precordillera
Sedimentology
biostratigraphy
morphology
paleoecology
palynology
sedimentology
Argentina
Acer pensylvanicum
algae
Amaranthaceae
Botryococcus
Chlorophyta
Dinophyceae
Ephedraceae
Fagaceae
Magnoliophyta
Malvaceae
Nothofagidites
Pediastrum
Podocarpaceae
Restionaceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v40_n1_p81_Barreda
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00027014_v40_n1_p81_Barreda
record_format dspace
spelling todo:paper_00027014_v40_n1_p81_Barreda2023-10-03T13:52:48Z First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera Barreda, V. Limarino, C. Fauqué, L. Tripaldi, A. Net, L. Cerro Morado Formation La Rioja Province Miocene Palynology Precordillera Sedimentology biostratigraphy Miocene morphology paleoecology palynology sedimentology Argentina Acer pensylvanicum algae Amaranthaceae Botryococcus Chlorophyta Dinophyceae Ephedraceae Fagaceae Magnoliophyta Malvaceae Nothofagidites Pediastrum Podocarpaceae Restionaceae The finding of palynological remains in the lower member of the Cerro Morado Formation is reported for the first time. The fossiliferous levels are located at the headwaters of the Guandacol river in southwestern La Rioja Province. In this area the Cerro Morado Formation has been divided into two members. The lower member, composed of sandstones, mudstones and scarse conglomerates and limestones, contains the palynological remains described in this paper. The palynological assemblages are not diverse, they are poorly preserved and dominated by aquatic elements mainly related to colonial green algae (Pediastrum spp., Botryococcus sp.) and dinoflagellates. Sporepollen assemblages consist of aquatic herbs of Restionaceae (Milfordia sp.) and Malvaceae (Baumannipollis chubutensis Barreda, Baumannipollis sp., Malvacipolloides comodoroensis Barreda). Typical lake shore vegetation consisted of members of Ephedraceae [Equisetosporites claricristatus (Shakmundes) Barreda, E. notensis (Cookson) Romero, E. lusaticus (Krutzsch) Barreda] and scarse Chenopodiaceae (Chenopodipollis chenopodiaceoides (Martin) Truswell). Pollen grains related to Podocarpaceae (Podocarpidites marwickii Couper, P. elegans Romero) and Fagaceae (Nothofagidites acromegacanthus Menéndez and Caccavari, N. americanus Zamaloa, N. saraensis Menéndez and Caccavari) are also present, although in low percentages. The known stratigraphic ranges of the recognized species, and the similarities of these assemblages to others previously described from Argentina, point to an Early to Middle Miocene age for this unit. Finally, sedimentological and palynological evidences suggest the development of a large and perennial water body during the time of deposition of the lower member of Cerro Morado Formation. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v40_n1_p81_Barreda
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cerro Morado Formation
La Rioja Province
Miocene
Palynology
Precordillera
Sedimentology
biostratigraphy
Miocene
morphology
paleoecology
palynology
sedimentology
Argentina
Acer pensylvanicum
algae
Amaranthaceae
Botryococcus
Chlorophyta
Dinophyceae
Ephedraceae
Fagaceae
Magnoliophyta
Malvaceae
Nothofagidites
Pediastrum
Podocarpaceae
Restionaceae
spellingShingle Cerro Morado Formation
La Rioja Province
Miocene
Palynology
Precordillera
Sedimentology
biostratigraphy
Miocene
morphology
paleoecology
palynology
sedimentology
Argentina
Acer pensylvanicum
algae
Amaranthaceae
Botryococcus
Chlorophyta
Dinophyceae
Ephedraceae
Fagaceae
Magnoliophyta
Malvaceae
Nothofagidites
Pediastrum
Podocarpaceae
Restionaceae
Barreda, V.
Limarino, C.
Fauqué, L.
Tripaldi, A.
Net, L.
First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
topic_facet Cerro Morado Formation
La Rioja Province
Miocene
Palynology
Precordillera
Sedimentology
biostratigraphy
Miocene
morphology
paleoecology
palynology
sedimentology
Argentina
Acer pensylvanicum
algae
Amaranthaceae
Botryococcus
Chlorophyta
Dinophyceae
Ephedraceae
Fagaceae
Magnoliophyta
Malvaceae
Nothofagidites
Pediastrum
Podocarpaceae
Restionaceae
description The finding of palynological remains in the lower member of the Cerro Morado Formation is reported for the first time. The fossiliferous levels are located at the headwaters of the Guandacol river in southwestern La Rioja Province. In this area the Cerro Morado Formation has been divided into two members. The lower member, composed of sandstones, mudstones and scarse conglomerates and limestones, contains the palynological remains described in this paper. The palynological assemblages are not diverse, they are poorly preserved and dominated by aquatic elements mainly related to colonial green algae (Pediastrum spp., Botryococcus sp.) and dinoflagellates. Sporepollen assemblages consist of aquatic herbs of Restionaceae (Milfordia sp.) and Malvaceae (Baumannipollis chubutensis Barreda, Baumannipollis sp., Malvacipolloides comodoroensis Barreda). Typical lake shore vegetation consisted of members of Ephedraceae [Equisetosporites claricristatus (Shakmundes) Barreda, E. notensis (Cookson) Romero, E. lusaticus (Krutzsch) Barreda] and scarse Chenopodiaceae (Chenopodipollis chenopodiaceoides (Martin) Truswell). Pollen grains related to Podocarpaceae (Podocarpidites marwickii Couper, P. elegans Romero) and Fagaceae (Nothofagidites acromegacanthus Menéndez and Caccavari, N. americanus Zamaloa, N. saraensis Menéndez and Caccavari) are also present, although in low percentages. The known stratigraphic ranges of the recognized species, and the similarities of these assemblages to others previously described from Argentina, point to an Early to Middle Miocene age for this unit. Finally, sedimentological and palynological evidences suggest the development of a large and perennial water body during the time of deposition of the lower member of Cerro Morado Formation.
format JOUR
author Barreda, V.
Limarino, C.
Fauqué, L.
Tripaldi, A.
Net, L.
author_facet Barreda, V.
Limarino, C.
Fauqué, L.
Tripaldi, A.
Net, L.
author_sort Barreda, V.
title First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
title_short First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
title_full First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
title_fullStr First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
title_full_unstemmed First palynological record for the Lower member of Cerro Morado Formation (Miocene), La Rioja Precordillera
title_sort first palynological record for the lower member of cerro morado formation (miocene), la rioja precordillera
url http://hdl.handle.net/20.500.12110/paper_00027014_v40_n1_p81_Barreda
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AT limarinoc firstpalynologicalrecordforthelowermemberofcerromoradoformationmiocenelariojaprecordillera
AT fauquel firstpalynologicalrecordforthelowermemberofcerromoradoformationmiocenelariojaprecordillera
AT tripaldia firstpalynologicalrecordforthelowermemberofcerromoradoformationmiocenelariojaprecordillera
AT netl firstpalynologicalrecordforthelowermemberofcerromoradoformationmiocenelariojaprecordillera
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