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GEOREF RECORD

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

Silvia Helena de Mello e Sousa, Thomas R. Fairchild and Paulo Tibana
Cenozoic biostratigraphy of larger Foraminifera from the Foz do Amazonas Basin, Brazil
Micropaleontology (2003) 49 (3): 253-266

Abstract

On the basis of thin-section studies of larger foraminifera in well cores and cuttings from the Amapa 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.


ISSN: 0026-2803
Coden: MCPLAI
Serial Title: Micropaleontology
Serial Volume: 49
Serial Issue: 3
Title: Cenozoic biostratigraphy of larger Foraminifera from the Foz do Amazonas Basin, Brazil
Affiliation: Universidade de Sao Paulo, Instituto Oceanografico, Sao Paulo, Brazil
Pages: 253-266
Published: 2003
Text Language: English
Publisher: American Museum of Natural History, New York, NY, United States
References: 46
Accession Number: 2004-038821
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 plates, sketch map
N02°00'00" - N10°00'00", W50°00'00" - W44°00'00"
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
Secondary Affiliation: Universidade Estadual do Rio de Janeiro, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200411
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