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Title: Schmidth Hammer exposure dating (SHED): Rapid age assessment of glacial landforms in the Pyrenees
Author: Tomkins, Matt D.
Dortch, Jason M.
Hughes, Philip D.
Huck, Jonny J.
Stimson, Andrew
Delmas, Magali
Calvet, Marc
Pallàs i Serra, Raimon
Keywords: Granit
Issue Date: Jul-2018
Publisher: Elsevier
Abstract: Schmidt hammer (SH) sampling of 54 10Be-dated granite surfaces from the Pyrenees reveals a clear relationship between exposure and weathering through time (n=52, R 2=0.96, P<0.01) and permits the use of the SH as a numerical dating tool. To test this 10Be-SH calibration curve, 100 surfaces were sampled from five ice-front positions in the Têt catchment, eastern Pyrenees, with results verified against independent 10Be and 14C ages. Gaussian modelling differentiates Holocene (9.4±0.6 ka), Younger Dryas (12.6±0.9 ka), Oldest Dryas (16.1±0.5 ka), last glacial maximum (LGM; 24.8±0.9 ka) and Würmian maximum ice extent stages (MIE; 40.9±1.1 ka). These data confirm comparable glacier lengths during the LGM and MIE (~300 m difference), in contrast to evidence from the western Pyrenees (≥15 km), reflecting the relative influence of Atlantic and Mediterranean climates. Moreover, Pyrenean glaciers advanced significantly during the LGM, with a local maximum at ~25 ka, driven by growth of the Laurentide Ice Sheet, southward advection of the polar front, and a solar radiation minimum in the Northern Hemisphere. This calibration curve is available online ( to enable wider application of this method throughout the Pyrenees.
Note: Versió postprint del document publicat a:
It is part of: Quaternary Research, 2018, vol. 90, num. 1, p. 26-37
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ISSN: 0033-5894
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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