| Texto completo | |
| Autor(es): |
Antonietto, Lucas Silveira
[1]
;
Gobbo, Silvia Regina
;
Do Carmo, Dermeval Aparecido
[1]
;
Assine, Mario Luiz
[2]
;
Castanheira Cordeiro Fernandes, Maria Alice Morgado
;
Silva, Jose Eduardo Lima E.
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Brasilia, BR-70910900 Brasilia, DF - Brazil
[2] Univ Estadual Paulista, BR-13506900 Sao Paulo - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF PALEONTOLOGY; v. 86, n. 4, p. 659-668, JUL 2012. |
| Citações Web of Science: | 14 |
| Resumo | |
The Araripe Basin is the most extensive interior basin in northeastern Brazil, comprising areas of Ceara, Piaui and Pernambuco states. The Santana Formation, attributed to the Aptian-?lower Albian age of the basin, is subdivided into two members, Crato and Romualdo, which bear an abundant fossil record of plant fragments, arthropods and vertebrates, especially 3D-preserved fishes. The present study focuses on the taxonomy, ontogeny and paleoecology of two ostracode species from the Romualdo Member and the top section of the Crato Member (Ipubi layers), Harbinia salitrensis (Krommelbein and Weber, 1971) emend. and H. alta new species. The ontogenetic series for both species are illustrated, except for the A-8 instar; H. salitrensis is also redescribed. The present work is also the first to produce quantitative information about the paleoecology of the Santana Formation based on ostracode populations. The results obtained from analyses of the population age-structure of both species, in addition to dominance (Simpson) and diversity index (Shannon) values, corroborated previous data on the studied sequence. According to these results, the strata were deposited in a limnic, low-to-moderate energy environment with salinity levels varying from oligohaline to mesohaline. The new data indicate the possibility of these environments also being hypersaline. (AU) | |
| Processo FAPESP: | 04/15786-0 - Reavaliacao da geologia da bacia do araripe, nordeste do brasil. |
| Beneficiário: | Mario Luis Assine |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |