A Middle Weichselain ice-free period in Western Norway: the Ålesund Interstadial

Autor:	Jan Mangerud, Gifford H. Miller, Oddvar Longva, Steinar Gulliksen, Eiliv Larsen, Eivind Sønstegaard, Hans Petter Sejrup
Rok vydání:	2008
Předmět:	Archeology Eemian biology Geology biology.organism_classification law.invention Foraminifera Paleontology Arctic law Period (geology) Stadial Radiocarbon dating Atlantic water Ecology Evolution Behavior and Systematics
Zdroj:	Boreas. 10:447-462
ISSN:	1502-3885 0300-9483
Popis:	Seven localities with fossil-bearing tills were found in the Alesund area. Fifteen radiocarbon dates of marine shells in the tills all gave ages between 28,000 and 38,000 years B.P. In spite of a general scepticism to shell dates giving high finite ages, these ages may be accepted mainly because of the quality of the shells, the geological situation in which they were found, and identical results for different fractions. The ice-free period is named the Alesund Interstadial. and its Middle Weichselian age is also suggested by amino acid D/L ratios in shells, compared with Late Weichselian and Eemian ratios. Shell and foraminifera faunas suggest arctic conditions with the Atlantic water present during the optimal period. The tills are non-sorted, compacted and interpreted to be basal tills. Their age is bracketed between c. 28,000 and 12,800 years B.P.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d59b38807bc6e4be2d8a7a478c86f07d https://doi.org/10.1111/j.1502-3885.1981.tb00508.x Zobrazit plný text záznamu