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Sedimentology and luminescence ages of glacial Lake Humber deposits in the central Vale of York

journal contribution
posted on 2023-06-07, 17:06 authored by Della K Murton, Steven M Pawley, Julian MurtonJulian Murton
The sedimentary sequence through the Hemingbrough Formation exposed at two sites in the central part of the Vale of York, south of the Escrick moraine ridge, is described and used to reconstruct the palaeoenvironmental history of Glacial Lake Humber. Interbedded wave ripples and laminated silts and clays at both sites indicate that Lake Humber was characterised by fluctuating water levels, often no deeper than wave base. Optically stimulated luminescence ages of 21.0 1.9, 21.9 2.0, and 24.1 2.2 kyr returned from two wave-rippled sandy beds within the glaciolacustrine sequence at Hemingbrough, c. 10 km south of the Escrick moraine ridge, provide the first direct chronological determination for the low-level phase of Lake Humber. As these beds are principally attributed to glacial meltwater emanating from the Vale of York ice lobe of the British Ice Sheet, when its margin was at or near the Escrick moraine ridge, this corroborates the interpretation that this ridge marks the LGM ice limit.

History

Publication status

  • Published

Journal

Proceedings of the Geologists' Association

ISSN

0016-7878

Issue

4

Volume

120

Page range

209-222

Department affiliated with

  • Geography Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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