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- W2116710137 abstract "Abstract In the case of Plum Creek, Lorain County (Ohio), the study of the activity of the stream and of the amount of work which it has done since a certain stage of the Glacial Epoch, has yielded important results. This stream began the erosion of its trough when the temporary lake, held up in front of the ice, was maintained for a considerable period at the level of its Fort-Wayne outlet; it has never had anything more resistant than Till to act upon. From a given section, 5000 feet long, it has excavated 34,000,000 cubic feet of Boulder-Clay, removing it from exposed banks 1600 feet long. Twelve years9 erosion of a 500-foot length of a part of the trough of the stream under observation, and from banks 1000 feet long, gives a rate of 8450 cubic feet per annum. Therefore, the removal of 34,000,000 cubic feet from the 5000-foot section would give a period of 2505 years. Considerations tending to lengthen the estimate are the former forestation of the area and the increased gradient in the artificial cut-off. Those tending to shorten the estimate are the present wider flood-plain, the time taken for forests to grow, and the probably greater former water-flow. The erosion of the Niagara Gorge began considerably later than that of Plum Creek, and probably dates from midway between the disappearance of the ice from Northern Ohio and from Quebec. If conditions have been uniform, the age of the Gorge would be 7000 years. As the Niagara" @default.
- W2116710137 created "2016-06-24" @default.
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- W2116710137 date "1908-03-01" @default.
- W2116710137 modified "2023-09-25" @default.
- W2116710137 title "Chronology of the Glacial Epoch in North America" @default.
- W2116710137 doi "https://doi.org/10.1144/gsl.jgs.1908.064.01-04.10" @default.
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