Drumlin Formation By Catastrophic Flooding
Since 1983, several investigators have developed a theory of due to the release of meltwater that is believed to have accumulated beneath melting ice sheets. The proposed catastrophic sheet floods, as wide as the drumlin fields, formed the drumlins and related streamlined landforms, such as flutings, over wide areas. So-called rogen moraine, consisting of transverse ridges of drift, often found associated with drumlins, is reinterpreted in the meltwater flood hypothesis as possible giant current ripples.
Existing drumlin fields reveal the extent of the areas affected by the proposed catastrophic floods. The Livingstone Lake drumlin field in Saskatchewan, where some very striking ...
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areas, by various workers. Shaw suggested as many as 10 meltwater discharges, similar to those which caused the Livingstone Lake drumlins, would be needed to account for drumlin fields in other areas [Shoemaker, 1995, p. 3].
The subglacial meltwater hypothesis of Shaw et al has several parallels to an interpretation of drumlins as streamlined landforms caused by the currents of flood waters generated by uplift, presented in the 1979 article Drumlins and Diluvial Currents by Cox. Although developed independently, Shaw's approach resembles that outlined by Cox in several ways. Cox published a photo with the above mentioned article showing drumlins in the Livingstone Lake area of northwestern Saskatchewan. These were some of the same ones that were the basis for Shaw's theory. Cox and Shaw both compared streamlined landforms produced in the Lake Missoula floods with typical drumlins, and followed the approach of the pioneering work of Sir James Hall in 1812, on the crag-and-tails ...
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were all formed in these catastropic conditions.
Observations reported by Kor and others, who found evidence of catastrophic currents which eroded and streamlined granite bedrock on the northeast shore of Georgian Bay [Kor, Shaw and Sharpe, 1991], and additional evidence presented by Brennand and others [Brennand, Shaw, & Sharpe, 1996] for the regional scale of the former catastrophic currents, complement and support interpretations by Cox, that currents with southwesterly orientation, generated by uplift centered in the highlands of the Canadian Shield northeast of the area, streamlined and scoured the Bruce Peninsula. These crustal movements may have been associated with subsidence ...
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"Drumlin Formation By Catastrophic Flooding." Essayworld.com. February 11, 2007. Accessed November 23, 2024. http://www.essayworld.com/essays/Drumlin-Formation-By-Catastrophic-Flooding/60165.
"Drumlin Formation By Catastrophic Flooding." Essayworld.com. February 11, 2007. Accessed November 23, 2024. http://www.essayworld.com/essays/Drumlin-Formation-By-Catastrophic-Flooding/60165.
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