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TitleSubmarine glacial landforms on the Bay of Fundy - northern Gulf of Maine continental shelf
AuthorTodd, B J; Shaw, J; Valentine, P C
SourceGeological Society Memoir vol. 46, 2016 p. 429-436, https://doi.org/10.1144/M46.154
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150187
PublisherGeological Society of London (London)
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNova Scotia; Eastern offshore region; New Brunswick
NTS20P; 20O; 21A; 21B
AreaBay of Fundy; Gulf of Maine; Grand Manan Basin; German Bank; Browns Bank; Northeast Channel; Georges Bank
Lat/Long WENS -68.0000 -62.0000 46.0000 41.0000
Subjectssubmarine features; ice retreat; submarine glacial landforms; glacial dynamics; ice-advance
Illustrationslocation maps; seismic reflection profiles; bathymetric profiles; diagram
ProgramLandslide Corrdination, Public Safety Geoscience
AbstractThe Bay of Fundy-northern Gulf of Maine region surrounds the southern part of Nova Scotia, encompassing, from west to east, the Bay of Fundy, Grand Manan Basin, German Bank, Browns Bank, Northeast Channel and northeastern Georges Bank (Fig. 1a, b). During the last glacial maximum (c. 24-20 14C ka BP), the SE margin of the Laurentide Ice Sheet (LIS) occupied the study area, the rest of the Gulf of Maine and the continental Scotian Shelf off Atlantic Canada (see Dyke et al. 2002, fig. 1; Shaw et al. 2006, fig. 8; Hundert & Piper 2008, fig. 16). Early mapping of the glaciated region on the Scotian Shelf using side-scan sonar imagery and seismic-reflection profiles revealed topographic features interpreted to be recessional moraines indicative of retreat of the LIS (King et al. 1972; King 1996). Subsequently, multibeam sonar seafloor mapping of local-scale glacial landforms on the inner Scotian Shelf off Halifax, Nova Scotia (Fig. 1b) provided further information on the dynamics of the advance and retreat of the ice sheet (Loncarevic et al. 1994). Interpretation of seismic-reflection profiles across Georges Bank revealed that the surficial sediment is a veneer of glacial debris transported to Georges Bank by the LIS during the late Pleistocene from continental areas to the north (Shepard et al. 1934; Knott & Hoskins 1968; Schlee 1973; Twichell et al. 1987; Fader et al. 1988). Recent high-resolution multibeam sonar surveys of German Bank and the Bay of Fundy mapped a complex of ice-advance and ice-retreat features attributed to the activity of the LIS (Todd et al. 2007; Todd & Shaw 2012).
Summary(Plain Language Summary, not published)
This is a contribution to an international atlas illustrating marine glacial landforms using detailed seabed imagery. This contribution focuses on glacial and deglacial features in areas directly affected by ice flow into the northern Gulf of Maine through the Bay of Fundy.
GEOSCAN ID296882