UIS Commission on Karst Hydrogeology and Speleogenesis
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Karstbase Bibliography Database

Wilson, Peter; Lord, Tom C.; Vincent, Peter. J.
Origin of the limestone pedestals at norber brow, north yorkshire, uk: a re-assessment and discussion
Cave and Karst Science
2012
39
1
5
11

Contrasting rates of limestone dissolution to account for the development of limestone pedestals beneath erratic boulders at Norber, North Yorkshire, have been proposed. Most of these estimates were made prior to reliable dates being available for erratic emplacement and prior to detailed knowledge of the pattern of regional 'post-glacial' climate change. The erratics were deposited c. 18 ka BP, and for a substantial part of the ensuing c. 4 ka a climate of Arctic severity prevailed until the abrupt warming at 14.7 ka BP, marking the onset of the Lateglacial Interstadial. We propose that nivation (snow-related) processes operated for much of that time, and again during the Younger Dryas Stadial (12.9 - 11.7 ka BP), and made a contribution to the lowering of the limestone surface by both mechanical and chemical action. Similar processes are likely to have operated for short periods on several occasions during the Holocene when, according to proxy records, climate deteriorated. We question previous views that dissolution occurred in an entirely temperate sub-regolith environment and/or was achieved solely by rainfall.

Limestone pedestals; Norber erratics; limestone dissolution; cosmogenic isotope surface exposure dating; optically stimulated luminescence dating; nivation processes; Lateglacial; Holocene
1356-191X
Wilson, Peter; Lord, Tom C.; Vincent, Peter. J. , 2012, Origin of the limestone pedestals at norber brow, north yorkshire, uk: a re-assessment and discussion , Cave and Karst Science , 39 , 5 - 11 http://bcra.org.uk/pub/candks/, PDF