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• W1969797890 abstract "A spectacular series of sculpted erosional forms (s-forms) is mapped and described from a 70 km wide area along the shore of Georgian Bay, Ontario, which, except for a scattered boulder lag, has been swept clean of sediment. A great variety of sculpted forms is described and illustrated and grouped into three classes: transverse, longitudinal, and nondirectional forms. Transverse forms comprise transverse troughs, muschelbrüche, sichelwannen, and comma forms; longitudinal forms comprise spindle flutes, cavettos, and furrows; and nondirectional forms consist of undulating surfaces and potholes. Transverse forms are preferentially located on stoss slopes, and longitudinal forms on lee slopes of rock rises. Undulating, nondirectional forms are found on distal slopes, and potholes at major breaks in slope. This correlation of form and bed topography suggests that relief exerts considerable control on both form and location. Form geometry is also inferred to be related to coherent flow structures and their interaction with the bed. Flow scale, vorticity, separation, bifurcation, strength, and direction are inferred from erosional-mark properties. In some cases, erosional forms appear to have caused the flow structure by which they were perpetuated. Sculpted forms occur at different scales, and the inferred flow structures are thought to have operated over the same scale range.Attributes of the forms, boulder lags, and inferred flow structures clearly reflect erosion by powerful, turbulent, subglacial meltwater flows. The erosional forms are observed over an area 70 km wide, which, taken together with a strongly uniform paleoflow direction, indicates regional-scale flow. The Georgian Bay floods were comparable in discharge (~10 7 m 3 /s) with floods from glacial Lake Missoula, Livingstone Lake drumlins, and Sable Island tunnel valleys. The most likely site for the storage of meltwater that drained catastrophically to form the erosional-mark field was the lowland stretching north from the Abitibi Highlands to Hudson Bay." @default.
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• W1969797890 date "1991-04-01" @default.
• W1969797890 modified "2023-10-16" @default.
• W1969797890 title "Erosion of bedrock by subglacial meltwater, Georgian Bay, Ontario: a regional view" @default.
• W1969797890 doi "https://doi.org/10.1139/e91-054" @default.
• W1969797890 hasPublicationYear "1991" @default.
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