Skip to Main Content
GEOREF RECORD

Benthic Foraminifera; indicators for a long-term improvement of living conditions in the late Valanginian of the NW German Basin

Christian Klein and Joerg Mutterlose
Benthic Foraminifera; indicators for a long-term improvement of living conditions in the late Valanginian of the NW German Basin
Journal of Micropalaeontology (July 2001) 20, Part 1: 81-95

Abstract

Foraminiferal occurrences in marine sediments of late Valanginian age (Early Cretaceous) are described from NW Germany. The distribution patterns of benthic foraminifera are discussed with respect to their abundance and diversity. Benthic foraminifera are characterized in terms of moderate diversity and abundance. Vertical fluctuations in foraminifera contents are discussed with respect to their palaeoecology and palaeobiogeography. Benthic foraminifera, which are represented by a total of 101 species, show a gradual increase of diversity throughout the late Valanginian. This improvement of living conditions in an epicontinental sea over a period of approximately 2 million years indicates a gradual recolonization of the formerly non-marine semi-restricted basin. The associations are dominated by agglutinated taxa with common Ammobaculites, Ammovertella, Bulbobaculites, Haplophragmoides, Proteonina, Psammosphaera and Reophax. The calcareous species Epistomina caracolla, which is extremely common in certain intervals, may reach significant abundances. Further agglutinated and calcareous taxa occur rarely. The early late Valanginian is marked by the occurrence of the Tethyan species Cerobertinella subhercynica, reflecting a major sea-level highstand.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 20, Part 1
Title: Benthic Foraminifera; indicators for a long-term improvement of living conditions in the late Valanginian of the NW German Basin
Affiliation: Ruhr-Universitaet Bochum, Institut fuer Geologie, Mineralogie und Geophysik, Bochum, Federal Republic of Germany
Pages: 81-95
Published: 200107
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 25
Accession Number: 2001-076872
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. charts, 2 plates, sketch map
N52°10'00" - N52°19'60", E08°30'00" - E08°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200124
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal