New gymnosperm wood fossils, a seed ovule structure, and a new generic affinity to cedroxylon canoasense rau from the permian and triassic jurassic of southern Brazil
Two new species of gymnosperm wood from the Triassic–Jurassic of Brazil are here described [Lobatoxylon kaokense Kräusel and Chapmanoxylon jamuriense (Maheswari) Pant & Singh], and a new age and generic a nity are proposed for Cedroxylon canoasense Rau. To the latter, originally considered as...
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| Autores principales: | , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
Sociedad Brasileira de Pleontología
2021
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| Materias: | |
| Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/27927 |
| Aporte de: |
| Sumario: | Two new species of gymnosperm wood from the Triassic–Jurassic of Brazil are here described [Lobatoxylon kaokense Kräusel
and Chapmanoxylon jamuriense (Maheswari) Pant & Singh], and a new age and generic a nity are proposed for Cedroxylon canoasense
Rau. To the latter, originally considered as Triassic, an early Permian age is proposed based on its lithological relationships and the location
of its discovery. Additionally, a seed-ovule structure linked to Kaokoxylon zalesskyi (Sahni) Maheswari wood materials, is illustrated and
analyzed. All materials were identiied in the sedimentary rocks exposed in the central E-W belt (Central Depression) of the State of Rio Grande
do Sul, South Brazil, where is exposed the Gondwana Sequence of Paraná Basin. The new wood taxa here described increase the number
of known genera in the Triassic–Jurassic of southern Brazil. Nevertheless, the arboreal vegetation of gymnosperms remains impoverished
when compared with that present in the Permian deposits. Survivors from the Permian–Triassic extinction, they show that new and more
evolved types were capable to explore and adapt to the new landscapes resulting from the environmental changes that a ected the interior
continental areas of Western Gondwana. |
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