Maximum extent and dynamic behaviour of the last British–Irish Ice Sheet west of Ireland

Abstract

Citation for published item:etersD tFvF nd fenettiD F nd hunlopD F nd ¡ y gof ighD gF @PHISA 9w ximum extent nd dyn mi eh viour of the l st fritish!srish s e heet west of srel ndF9D u tern ry s ien e reviewsFD IPV F ppF RVETVF Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. years. Estimated retreat rates of marine-terminating ice across the shelf range from ~70-180myr -1 . 21

Sedimentology and chronology of the advance and retreat of the last British-Irish Ice Sheet on the continental shelf west of Ireland

“…Most of these 636 reworked deposits likely record iceberg turbation on or near moraine ridges. This interpretation is 637 consistent with a previous examination of iceberg plough mark geomorphology in the Slyne Trough, 638 which documents iceberg grounding against moraine ridges and a roughly northward palaeocurrent 639 (Peters et al, 2015). Postglacial mass wasting, which likely would have been most intense on the 640 morainic ridges, is another potential source for sediment reworking (cf.…”

“…Trough (Peters et al, 2015). This interpretation is supported by the southward broadening of the 399 arcuate ridge, which is consistent with moraines that were overridden and smoothed by readvancing 400 ice (e.g.…”

“…2a) with the sinuous ridges in the Slyne Trough, which have been interpreted as a record of grounded ice 394 extent, followed by ice shelf recoupling during retreat (Peters et al, 2015). The ridge-corrugation 395 alignment (Fig.…”

“…The thickest (up to 21 cm) of the 646 lithic-dominated, winnowed sediment units are found in the Slyne Trough; this is interpreted as a 647 result of coarse sub-ice shelf or ice-proximal sediment supply that led to increased IRD production 648 after ice shelf break up. The relative abundance of large lithic clasts was likely increased by 649 winnowing from a northward Slyne Trough palaeocurrent that developed following ice shelf break up 650 (Peters et al, 2015). Another thick, lithic, winnowed sediment unit overlies the highly-consolidated, 651 subglacial till at the base of core 10-38 (Figs.…”

“…Bradwell ( Fig. 1), and that its behaviour there was dynamic, fluctuating in extent and forming an ice shelf over 73 the Slyne Trough (Peters et al, 2015). These offshore studies have led to a general shift in the 74 prevailing consensus on BIIS maximum extent from a marine margin that did not extend far past the 75 modern western Irish coastline (Bowen et al, 1986) to one that predominantly reached the edge of the 76 continental shelf (Clark et al, 2012; Fig.…”