scholarly journals Surficial Geology of Hecate Strait, British Columbia Continental Shelf

1988 ◽  
Author(s):  
J V Barrie
Keyword(s):  
British Columbia ◽  
Continental Shelf ◽  
Surficial Geology

Surficial geology of Hecate Strait, British Columbia continental shelf

1989 ◽  
Vol 26 (6) ◽  
pp. 1241-1254 ◽  
Author(s):  
J. V. Barrie ◽  
B. D. Bornhold
Keyword(s):  
British Columbia ◽  
Continental Shelf ◽  
Glacial Till ◽  
Hydrodynamic Conditions ◽  
Surficial Geology ◽  
Sand Ridges ◽  
Late Tertiary ◽  
Drainage Channels ◽  
Late Wisconsinan ◽  
Geological Units

Four surficial geological units are defined geophysically for Hecate Strait on the northern British Columbia continental shelf. They consist of Tertiary bedrock (unit 1) unconformably overlain in much of the strait of glacial till (unit 2), which is in turn overlain below 200 m water depth by thick silts (unit 4) and above 200 m by Quaternary sands and gravels (unit 3), except in areas where till or Tertiary bedrock is at or near surface.Glacial ice covered most of the strait at some time in the Pleistocene, but evidence for a Late Wisconsinan advance is more prevalent in the principal troughs of the strait. Sea level was as low as the present-day 180 m isobath during the late Tertiary or early Quaternary and possibly as low as 100 m at the end of the Pleistocene, based on the presence of drainage channels, wave-cut terraces, and both shore-oblique and shore-parallel sand ridges. Sedimentary bedforms found ubiquitously above 100 m appear to be in equilibrium with the present hydrodynamic conditions, and their presence suggests that significant seabed erosion and transport occur within the strait.

A mammoth (Mammuthus primigenius) tooth from late Wisconsin deposits near Embden, North Dakota, and comments on the distribution of woolly mammoths south of the Wisconsin ice sheets

1986 ◽  
Vol 23 (7) ◽  
pp. 909-918 ◽  
Author(s):  
C. R. Harington ◽  
Allan C. Ashworth
Keyword(s):  
British Columbia ◽  
Continental Shelf ◽  
North Dakota ◽  
Third Molar ◽  
Ice Sheets ◽  
Lake Agassiz ◽  
Mammuthus Primigenius ◽  
Sand And Gravel ◽  
Woolly Mammoth ◽  
Cass County

A well-preserved third molar of a woolly mammoth (Mammuthus primigenius) was recovered from sand and gravel forming the highest (Herman) prominent strandline of Lake Agassiz near Embden in western Cass County, North Dakota. The Herman strandline is estimated to have formed about 11 500 years BP, and presumably the tooth is of similar age. Perhaps the animal lived in a tundra-like area near the Lake Agassiz shoreline.Additional evidence suggests that woolly mammoths occupied a tundra-like range south of the Wisconsin ice sheets extending from southern British Columbia to the Atlantic continental shelf off Virginia.

scholarly journals Surficial geology, Vernon, west of Sixth Meridian, British Columbia

1974 ◽  
Author(s):  
R J Fulton ◽  
A A Berti ◽  
G W Smith
Keyword(s):  
British Columbia ◽  
Surficial Geology
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