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Cenozoic biostratigraphy of larger foraminifera from the Foz do Amazonas Basin, Brazil

2003; Micropaleontology Press; Volume: 49; Issue: 3 Linguagem: Inglês

10.2113/49.3.253

1937-2795

Silvia Helena de Mello e Sousa,

Geological formations and processes

Research Article| January 01, 2003 Cenozoic biostratigraphy of larger foraminifera from the Foz do Amazonas Basin, Brazil Silvia Helena de Mello e Sousa; Silvia Helena de Mello e Sousa * 1Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo, SP, Brazil, email:smsousa@ceres.io.usp.br *Corresponding author. Search for other works by this author on: GSW Google Scholar Thomas R. Fairchild; Thomas R. Fairchild 2Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, São Paulo, SP, Brazil, CEP-05508-080 Search for other works by this author on: GSW Google Scholar Paulo Tibana Paulo Tibana 3Instituto de Geociências, Universidade Estadual do Rio de Janeiro, Rio de Janeiro, RJ, Brazil, CEP-20.559-900 Search for other works by this author on: GSW Google Scholar Micropaleontology (2003) 49 (3): 253–266. https://doi.org/10.2113/49.3.253 Article history received: 06 Jan 2003 accepted: 10 Jul 2003 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Silvia Helena de Mello e Sousa, Thomas R. Fairchild, Paulo Tibana; Cenozoic biostratigraphy of larger foraminifera from the Foz do Amazonas Basin, Brazil. Micropaleontology 2003;; 49 (3): 253–266. doi: https://doi.org/10.2113/49.3.253 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyMicropaleontology Search Advanced Search Abstract On the basis of thin-section studies of larger foraminifera in well cores and cuttings from the Amapá Formation of the Foz do Amazonas Basin nine informal biozones (LF1-LF9) have been recognized for the upper Paleocene to middle Miocene of this basin. Lepidocyclinids are the most abundant of the larger foraminifera in the formation, and the occurrence of Lepidocyclina rdouvillei in the late middle Eocene (LF4 biozone, equivalent to planktonic foraminiferal biozones P13-P14) corroborates the hypothesis of an American origin for this genus and its rapid colonization of the northeastern margin of South America in the middle Eocene. By at least middle Eocene times, strong American affinities of the larger foraminifera of the equatorial Atlantic margins of both South America and Africa had become established by eastward migration. The presence of larger foraminifera throughout the entire carbonate section in the basin suggests that there were no significant changes in the equatorial climate of this region during the Tertiary. Extinctions of some larger foraminifera in the basin were related to environmental and ecological changes associated with sea level fluctuations. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.