Triassic plants from the Rincón Blanco Group, San Juan Province, Argentina

Fluvial and lacustrine strata of the Portezuelo and Casa de Piedra Formations, Rincón Blanco Group, Middle to Upper Triassic of San Juan province, yield a distinctive taphoflora. The Portezuelo Formation plant remains are relatively scarce and mostly include peltasperms (Lepidopteris madagascariensi...

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Detalles Bibliográficos
Autor principal: Ottone, E.G.
Formato: JOUR
Materias:
Argentina
Plants
Sistematics
Triassic
fossil assemblage
paleobotany
paleoecology
plant
taxonomy
San Juan [Argentina]
South America
Coniferales
Coniferophyta
Corystospermales
Cycadales
Cycadeoidales
Dicroidium
Dicroidium odontopteroides
Equisetophyta
Neocalamites
Obtusifolium
Pseudoctenis
Taeniopteris
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p477_Ottone
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Fluvial and lacustrine strata of the Portezuelo and Casa de Piedra Formations, Rincón Blanco Group, Middle to Upper Triassic of San Juan province, yield a distinctive taphoflora. The Portezuelo Formation plant remains are relatively scarce and mostly include peltasperms (Lepidopteris madagascariensis Carpentier and Antevsia sp.), together with Bennettitales (Taeniopteris sp.), and probable Coniferales (Incertae sedis (ovule scale?) sp. B) and pteridosperm fronds (Incertae sedis sp. A). The fossil plant assemblage recovered from the Casa de Piedra Formation is more abundant and mainly includes Corystospermales (Dicroidium incisum (Du Toit) Anderson and Anderson, D. odontopteroides var. moltense Retallack, D. odontopteroides var. obtusifolium Johnston, D. odontopteroides var. remotum (Szajnocha) Retallack, Xylopteris densifolia (Du Toit) Frenguelli, X. remotipinnulia (Anderson and Anderson) comb. nov., X. rigida (Dun) Jain and Delevoyras, X. spinifolia (Tenison-Woods) Frenguelli and Zuberia zuberi (Szajnocha) Frenguelli, but also Sphenophyta (Neocalamites sp.) and Cycadales (Pseudoctenis sp. A and P. sp. B). The flora of the Rincón Blanco Group would chiefly represent a substratum of herbaceous and shrubby vegetation. Although the Portezuelo and Casa de Piedra Formations have been referred to the Cortaderitian and Florian stages, on the basis of regional correlations, the lack of diagnostic taxa difficult close comparisons of the Rincón Blanco Group flora with local biozones. © Asociación Paleontológica Argentina.

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