New records in the megaflora of the El Tranquilo group (Middle-Upper Triassic), Patagonia, Argentina
This contribution presents new records of vegetative structures found in the El Tranquilo Group, Santa Cruz, Argentina. The sedimentary unit under study comprises two formations: the Cañadón Largo Formation (lower section, Upper Ladinian–Lower Carnian) and Laguna Colorada Formation (upper section, N...
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| Autores principales: | , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Facultad de Ciencias Exactas y Naturales y Agrimensura
2025
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| Acceso en línea: | https://revistas.unne.edu.ar/index.php/fce/article/view/8846 |
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| Sumario: | This contribution presents new records of vegetative structures found in the El Tranquilo Group, Santa Cruz, Argentina. The sedimentary unit under study comprises two formations: the Cañadón Largo Formation (lower section, Upper Ladinian–Lower Carnian) and Laguna Colorada Formation (upper section, Norian–? Sinemurian). These two continental formations are separated by an unconformity caused by tectonic uplift and volcanic activity during the Upper Triassic. New collections have revealed the presence of Dicroidium matatifolium, D. dutoitii, and D. coriaceum (Umkomasiales), as well as Pachydermophyllum praecordillerae (Peltaspermales), in the Cañadón Largo Formation. In contrast, Equisetites patagonica (Equisetales), Neocalamites carrerei (Equisetales incertae sedis) and D. crassum (Umkomasiales) were identified in the Laguna Colorada Formation. Thus, these new records enrich the palaeobotanical record of Triassic megaflora in Santa Cruz through the description of new taxa in the ‘El Tranquilo Group’, including four species of Dicroidium, one species each of Equisetites and Neocalamites, and Pachydermophyllum. |
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