Publikationsdatum:
2022-05-25
Beschreibung:
Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of Geological Society of London for personal use, not for redistribution. The definitive version was published in Geological Society, London, Memoirs 46 (2016): 429-436, doi:10.1144/M46.154.
Beschreibung:
The 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). During the last glacial
maximum (~24–20 14C ka BP), the southeast 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; Hundert & Piper 2008, Fig. 16; Shaw et al. 2006, Fig. 8).
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; Stea et al. 1998). Subsequently,
multibeam sonar seafloor mapping of local-scale glacial landforms on the inner Scotian Shelf off
Halifax, Nova Scotia (Fig. 1a) 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; Oldale & Uchupi 1970; Schlee 1973; Schlee &
Pratt 1970; 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).
Beschreibung:
2017-11-01
Repository-Name:
Woods Hole Open Access Server
Materialart:
Preprint
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