A revised seismic stratigraphy for Quaternary deposits on the inner continental shelf west of Scotland between 55°30‘N and 57°30’N

Abstract

19840301: A revised seismic B O W stratigraphy for Quaternary deposits on the inner continental shelf west of Scotland between SS"30'N and 57"30'N. Boreus, Vol. 13, pp. 4'+66. Oslo. ISSN 0300-9483.A stratigraphy for Quaternary deposits o n the western Scottish shelf bas been erected using seismic and borehole data. Eight new formations are defined and described with evidence presented for the environment of deposition of each formation. Most of the Quaternary sediments preserved on the shelf arc shown to have accumulated under stadia1 or glacial conditions. The possible age of each formation is discussed within the context of evidence provided from the mainland. shelf and dcep-sea cores. Two are thought to be pre-Devensian. one is possibly pre-Devcnsian. one is possibly Early and/or Middle Devensian. two are probably Late Devensian. one is Latc Devensian to Holocene and one Present day in age. It is suggested that the Late Devensian ice reached the shelf margin south of the Outer Hebridean Platform.

Submarine deglacial sediment and geomorphological record of southwestern Scotland after the Last Glacial Maximum

“…The study also integrates previously published research (Davies et al, 1984;Fyfe et al, 1993;Howe et al, 2015;Dove et al, 2015;Small et al, 2017) and unpublished BGS…”

“…A seismo-stratigraphical framework of the Hebrides-Malin Sea was proposed by Davies et al (1984), improving on earlier work (Binns et al, 1974;Bishop & Jones, 1979;Boulton et al, 1981) ( Figure A1, Supp. Material).…”

“…It proposed that ice expansion during the LGM produced an irregular unconformity, patchily covered by a thin diamicton, named Hebrides Formation (Fm.) (Davies et al, 1984) or Minch Fm. (Boulton et al, 1981) and interpreted as till.…”

Freshwater influx, hydrographic reorganization and the dispersal of ice‐rafted detritus in the sub‐polar North Atlantic Ocean during the last deglaciation

“…1). The St Kilda basin is a glacially over-deepened basin that is within the limits of the last British-Irish Ice Sheet (BIIS) (Davies et al, 1984;Peacock et al, 1992;Stoker et al, 1993). This conclusion is supported by a 14 C date of 22 480 AE 300 14 C a BP [27.1 cal ka BP (OxCal v4.1, Bronk Ramsey, 2009), MARINE09 (Reimer et al, 2009)] on marine shell material to the west of morainal banks marking the aforementioned BIIS limit and of 'basal' ages <16 14 C ka BP (<19 cal ka BP) within those same limits (Peacock et al, 1992;Austin and Kroon, 1996).…”

The seabed geomorphology and geological structure of the Firth of Lorn, western Scotland, UK, as revealed by multibeam echo-sounder survey

“…These data were incorporated, with modifications, in the British Geological Survey 1:250,000 map (British Geological Survey 1987). A framework for the Quaternary stratigraphy of this part of the Scottish shelf was presented by Davies et al (1984). A very useful review of the geological evolution and stratigraphy of the Malin Shelf, to the west of the Firth of Lorn, is given by Fyfe et al (1993).…”