Asociación de Briofitas de la Formación la Cantera, Aptiano Tardío, Cuenca de San Luis, Argentina

Puebla, Gabriela Griselda; Mego, Natalia; Prámparo, Mercedes B.

doi:10.5710/amgh.v49i2(504)

Cited by 14 publications

(1 citation statement)

References 22 publications

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“…Los resultados aquí obtenidos son un complemento a los estudios que se vienen realizando dentro de la misma cuenca (Cuenca de San Luis), pero en otro depocentro (Sierra del Gigante), sobre la macro y microfl ora de la Formación La Cantera (Prámparo, 1988(Prámparo, , 1989(Prámparo, , 1994Puebla, 2009;Puebla et al, 2012) ya que ambas unidades (formaciones La Cantera y Lagarcito) pertenecen al Grupo El Gigante.…”

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Esporas triletes verrucosas de la Formación Lagarcito (Albiano?), Sierra de Guayaguas, Provincia de San Juan, Argentina: análisis bioestratigráfico

Mego¹,

Prámparo²

2013

rev. bras. paleontol.

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-VERRUCATE TRILETE SPORES FROM THE LAGARCITO FORMATION (ALBIAN?) SIERRA DE GUAYAGUAS, SAN JUAN PROVINCE: ARGENTINA. BIOSTRATIGRAPHIC ANALYSIS. A detailed study of the systematics of 13 species of verrucate trilete spores recovered from the Lagarcito Formation is presented. Taxonomic studies of these types of spores with great morphological diversity are very important as they constitute a useful contribution for the clarifi cation of many misidentifi cations usually very common within this morphologic group. The Lagarcito Formation is part of the El Gigante Group, formed by continental sediments of fl uvio-deltaic origin deposited in an extensional basin. The material was collected in a section exposed in the eastern side of the Sierra de Guayaguas, southeast of the San Juan province and corresponds to shallow lacustrine sediments. The following species are described and illustrated: Within the palynofl ora the verrucate trilete spores are abundant and correspond to the fern families: Lycopodiaceae, Selaginellaceae, Cyatheaceae, Osmundaceae, Dicksoniaceae and Schizaeaceae, indicative of local humid conditions near the lacustrine bodies. Based on the analysis of the occurrence and biostratigraphical value of the studied species in different Lower Cretaceous basins in Argentina and other related places, an Aptian-Albian range is concluded for the verrucate spore association recovered from the Lagarcito Formation. The present systematic study provides also new insight to the vegetal diversity developed during the Early Cretaceous in central-western Argentina.

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Esporas triletes verrucosas de la Formación Lagarcito (Albiano?), Sierra de Guayaguas, Provincia de San Juan, Argentina: análisis bioestratigráfico

Mego¹,

Prámparo²

2013

rev. bras. paleontol.

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Fossil record of Ephedra in the Lower Cretaceous (Aptian), Argentina

et al. 2017

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Fossil plants from the Lower Cretaceous (upper Aptian) of the La Cantera Formation, Argentina, are described. The fossils studied represent a leafy shooting system with several orders of articulated and striated axes and attached leaves with unequivocal ephedroid affinity. We also found associated remains of ovulate cones with four whorls of sterile bracts, which contain two female reproductive units (FRU). Ovulate cone characters fit well within the genus Ephedra. Special characters in the ovulate cones including an outer seed envelope with two types of trichomes, allowed us to consider our remains as a new Ephedra species. Abundant dispersed ephedroid pollen obtained from the macrofossil-bearing strata also confirms the abundance of Ephedraceae in the basin. The co-occurrence of abundant fossil of Ephedra (adapted to dry habitats) associated with thermophilic cheirolepideacean conifer pollen (Classopollis) in the unit would suggest marked seasonality at the locality during the Early Cretaceous. Furthermore, the floristic association is linked to dry sensitive rocks in the entire section. The macro- and microflora from San Luis Basin are similar in composition to several Early Cretaceous floras from the Northern Gondwana floristic province, but it may represent one of the southernmost records of an arid biome in South America.

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Late Cretaceous flora of the Hidden Lake Formation, James Ross Island (Antarctica), its biostratigraphy and palaeoecological implications

Kvaček

Vodrážka

2016

Cretaceous Research

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Asociación de Briofitas de la Formación la Cantera, Aptiano Tardío, Cuenca de San Luis, Argentina

Cited by 14 publications

References 22 publications

Esporas triletes verrucosas de la Formación Lagarcito (Albiano?), Sierra de Guayaguas, Provincia de San Juan, Argentina: análisis bioestratigráfico

Esporas triletes verrucosas de la Formación Lagarcito (Albiano?), Sierra de Guayaguas, Provincia de San Juan, Argentina: análisis bioestratigráfico

Fossil record of Ephedra in the Lower Cretaceous (Aptian), Argentina

Late Cretaceous flora of the Hidden Lake Formation, James Ross Island (Antarctica), its biostratigraphy and palaeoecological implications

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