Drumlins are streamlined hills formed beneath moving ice and often exposed after deglaciation. In 1980s papers, John Shaw argued that pressurized subglacial meltwater could cut some drumlins during outburst floods. The video presents Shaw’s debated flood model as an alternative to formation by ice alone.
Video presents drumlins as evidence for Shaw’s debated subglacial flood theory
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Key facts
- Drumlins are streamlined landforms formed beneath moving ice and preserved in formerly glaciated terrain; many are till hills, but some are bedrock-cored.
- John Shaw argued in 1980s papers that pressurized subglacial meltwater could erode some drumlins during outburst floods. His 1989 article lists him with the Department of Geography at Queen’s University, Kingston.
- Critics said Shaw’s model required unrealistically large volumes of stored water. It remains a debated alternative, not an accepted explanation for all drumlins.
- Randall Carlson states that he has mapped drumlin swarms in the Finger Lakes, Minnesota, Green Bay, Lake Oshkosh and the Fraser Plateau.
- Carlson says the drumlins north of the Finger Lakes are oriented toward the same point in eastern Lake Ontario as the Finger Lakes axes.
- Drumlin distribution and orientation help reconstruct former ice flow and ice-sheet margins; glaciofluvial models combine glacial ice with basal meltwater.
Sources
Drumlin formation by subglacial meltwater erosionfaculty.washington.edu
JOHN SHAW Department. Some drumlins are shown to belong to a family of remnant erosional ridges associated with subglacial meltwater. related to inverted melt- ...
John Shaw Responds to: Drumlins and subglacial meltwater ...creationconcept.info
The following is Dr. John Shaw's response to my comments on his subglacial meltwater flood theory, presented here with his permission.
Drumlins and catastrophic subglacial floodssciencedirect.com
by J Shaw · 1989 · Cited by 206 — Drumlins are associated with landforms related to such floods, and landscapes produced by outburst floods in extraglacial areas contain drumlin-like landforms.
Drumlins, subglacial meltwater floods, and ocean responsesresearchgate.net
Drumlins, subglacial meltwater floods, and ocean responses John Shaw unrealistically large volumes of stored water required. interpreted features such as ...
Drumlins, subglacial meltwater floods, and ocean responsespubs.geoscienceworld.org
by J Shaw · 1989 · Cited by 104 — Drumlins, subglacial meltwater floods, and ocean responses. John Shaw. John Shaw. 1. Department of Geography, Queen's University, Kingston ...
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