FN Archimer Export Format
PT J
TI The Last Scottish Ice Sheet
BT 
AF Ballantyne, Colin K.
   Small, David
AS 1:1;2:2;
FF 1:;2:;
C1 UNIV ST ANDREWS
   UNIV DURHAM
C2 UNIV ST ANDREWS, UK
   UNIV DURHAM, UK
IF 2.839
TC 25
UR https://archimer.ifremer.fr/doc/00505/61627/65539.pdf
LA English
DT Article
CR IMAGES 1-MD101
   MD 141 / ALIENOR 1
BO Marion Dufresne
DE ;British-Irish Ice Sheet;deglaciation;Dimlington Stade;flowsets;ice streams;Late Devensian;lithostratigraphy;radiocarbon dating;readvances;terrestrial cosmogenic nuclide dating
AB The last Scottish Ice Sheet (SIS) expanded from a pre-existing ice cap after ∼35 ka. Highland ice dominated, with subsequent build-up of a Southern Uplands ice mass. The Outer Hebrides, Skye, Mull, the Cairngorms and Shetland supported persistent independent ice centres. Expansion was accompanied by ice-divide migration and switching flow directions. Ice nourished in Scotland reached the Atlantic Shelf break in some sectors but only mid-shelf in others, was confluent with the Fennoscandian Ice Sheet (FIS) in the North Sea Basin, extended into northern England, and fed the Irish Sea Ice Stream and a lobe that reached East Anglia. The timing of maximum extent was diachronous, from ∼30–27 ka on the Atlantic Shelf to ∼22–21 ka in Yorkshire. The SIS buried all mountains, but experienced periods of thickening alternating with drawdown driven by ice streams such as the Minch, the Hebrides and the Moray Firth Ice Streams. Submarine moraine banks indicate oscillating retreat and progressive decoupling of Highland ice from Orkney–Shetland ice. The pattern and timing of separation of the SIS and FIS in the North Sea Basin remain uncertain. Available evidence suggests that by ∼17 ka, much of the Sea of the Hebrides, the Outer Hebrides, Caithness and the coasts of E Scotland were deglaciated. By ∼16 ka, the Solway lowlands, Orkney and Shetland were deglaciated, the SIS and Irish Ice Sheet had separated, the ice margin lay along the western seaboard, nunataks had emerged in Wester Ross, the ice margin lay N of the Cairngorms and the sea had invaded the Tay and Forth estuaries. By ∼15 ka, most of the Southern Uplands, the Firth of Clyde, the Midland Valley and the upper Spey valley were deglaciated, and in NW Scotland ice was retreating from fjords and valleys. By the onset of rapid warming at ∼14.7 ka, much of the remnant SIS was confined within the limits of Younger Dryas glaciation. The SIS, therefore, lost most of its mass during the Dimlington Stade. It is uncertain whether fragments of the SIS persisted on high ground throughout the Lateglacial Interstade. 
PY 2019
PD MAR
SO Earth And Environmental Science Transactions Of The Royal Society Of Edinburgh
SN 1755-6910
PU Cambridge University Press (CUP)
VL 110
IS 1-2
UT 000482960300004
BP 93
EP 131
DI 10.1017/S1755691018000038
ID 61627
ER

EF