Skip to Main Content
GEOREF RECORD

Late Quaternary benthonic Foraminifera in a bathyal core from the Leeward Islands, Lesser Antilles, NE Caribbean Sea

Brent Wilson
Late Quaternary benthonic Foraminifera in a bathyal core from the Leeward Islands, Lesser Antilles, NE Caribbean Sea
Journal of Micropalaeontology (November 2008) 27, Part 2: 177-188

Abstract

The 3.13 m long bathyal piston core En20-2 from the northern Leeward Islands (17 degrees 49.9'N, 63 degrees 02.4'W, water depth 680 m) was sampled every 20 cm. The Pleistocene-Holocene boundary occurred at 107 cm, and the base of the core lay above the Atlantic extinction of Pulleniatina obliquiloculata (34 ka BP). The core yielded throughout both (a) a deep-water association (DWA) of middle bathyal benthonic foraminifera and (b) a shallow-water association (SWA; up to 56% of total recovery) comprising back-reef, epiphytal species. The environmental trends suggested by the two groups are compared. Although sea-levels during the Late Pleistocene and Early Holocene rose abruptly, there was no abrupt change in the DWA at the Pleistocene-Holocene boundary, but a gradual change from a higher-productivity fauna (Bulimina spp., Uvigerina spp.) at the base of the core to a lower-productivity fauna (Cassidulina spp., Globocassidulina spp.) at the top. Microhabitat preference changed from shallow-infaunal at the core base to primarily epifaunal at the top. Diversity and species dominance did not differ significantly between the Late Pleistocene and the Holocene. Percentage abundances of species were calculated separately for the DWA and SWA. Seventy significant correlations were found between the percentage abundances of individual DWA and SWA species, the two strongest correlations--both positive--being between (a) Neoconorbina terquemi and Uvigerina laevis, and (b) Amphistegina gibbosa and Cassidulina curvata. The percentage abundance of U. laevis decreased up-section, whereas the percentage abundance of A. gibbosa increased up-section, reflecting a change in the nutrient flux over time that impacted on both the DWA and the SWA. Positive correlations between the DWA low-productivity indicator Globocassidulina subglobosa and the SWA species Asterigerina carinata, Elphidium discoidale, Peneroplis bradyi and P. proteus suggests that these four SWA species comprise a guild. J. Micropalaeontol. 27(2): 177-188, November 2008.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 27, Part 2
Title: Late Quaternary benthonic Foraminifera in a bathyal core from the Leeward Islands, Lesser Antilles, NE Caribbean Sea
Author(s): Wilson, Brent
Affiliation: University of the West Indies, Petroleum Geoscience Programme, Saint Augustine, Trinidad and Tobago
Pages: 177-188
Published: 200811
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 53
Accession Number: 2009-059229
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 2 tables, sketch map
N17°49'60" - N17°49'60", W63°01'60" - W63°01'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200932
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal