Universität zu Köln

Bennike, Ole, Hedenas, Lars, High, Kirsty, Korshoj, Joakim S., Lemdahl, Geoffrey, Penkman, Kirsty, Preece, Richard C., Rosenlund, Knud and Viehberg, Finn A. (2019). New interglacial deposits from Copenhagen, Denmark: marine Isotope Stage 7. Boreas, 48 (1). S. 107 - 119. HOBOKEN: WILEY. ISSN 1502-3885

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Abstract

During a pre-site survey and construction of a new metro route and station in Copenhagen, fossiliferous organic-rich sediments were encountered. This paper reports on multidisciplinary investigations of these organic sediments, which occurred beneath a sediment succession with a lower till, glacifluvial sand and gravel, an upper till and glacifluvial sand. The organic sediments were underlain by glacifluvial sand and gravel. The organic-rich sediments, which were up to 0.5 m thick, accumulated in a low-energy environment, possibly an oxbow lake. They were rich in plant fossils, which included warmth-demanding trees and other species, such as Najas minor, indicating slightly higher summer temperatures than at present. Freshwater shells were also frequent. Bithynia opercula allowed the sediments to be put into an aminostratigraphical framework. The amino acid racemization (AAR) ratios indicate that the organic sediments formed during Marine Isotope Stage 7 (MIS 7), which is consistent with optically stimulated luminescence dating that gave ages of 206 and 248 ka from the underlying minerogenic deposit. The assemblages from Trianglen are similar to interglacial deposits from the former Free Port (1.4 km away) in Copenhagen, except that Corbicula and Pisidium clessini were not found at Trianglen. The presence of these bivalves at the Free Port and the ostracod Scottia tumida at Trianglen indicates a pre-Eemian age. AAR data from archived Bithynia opercula from the Free Port were almost identical to those from Trianglen, indicating that the two sites are contemporary. We suggest the Trianglen interglacial be used as a local name for the MIS 7 interglacial deposits in Copenhagen. MIS 7 deposits have rarely been documented from the region, but MIS 7 deposits may have been mistaken for other ages. The use of AAR ratios in Bithynia opercula has a great potential for correlation of interglacial non-marine deposits in mainland northern Europe.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bennike, Ole UNSPECIFIED UNSPECIFIED UNSPECIFIED Hedenas, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED High, Kirsty UNSPECIFIED UNSPECIFIED UNSPECIFIED Korshoj, Joakim S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lemdahl, Geoffrey UNSPECIFIED UNSPECIFIED UNSPECIFIED Penkman, Kirsty UNSPECIFIED UNSPECIFIED UNSPECIFIED Preece, Richard C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosenlund, Knud UNSPECIFIED UNSPECIFIED UNSPECIFIED Viehberg, Finn A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-140652
DOI:	10.1111/bor.12342
Journal or Publication Title:	Boreas
Volume:	48
Number:	1
Page Range:	S. 107 - 119
Date:	2019
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1502-3885
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLLUSCAN FAUNA; PLEISTOCENE; DIFFERENTIATION; SEQUENCE; SITE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14065