The Centennial Milestone. An Address in Commemoration of the One Hundredth Anniversary of the Incorporation of Quincy, Mass
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One of the present theories of geologists, and a theory as plausible as any yet suggested, is that these drum- lins were accumulations in the bed of the ice movement of much the same character as those now seen wherever a body of water runs over a comparatively level bottom. In such cases, any obstacle which causes the current to move more slowly in one portion of the channel than in another, will lead to an accumulation of soil or ma- terial at the point of slackening. In this wa)^, wherever, ...after the original surface-soil was removed by the ice-flow, there existed on the surface of the country a ledge or other unusual obstacle, such as an accumulation of boulders more easily surmounted than removed, the movement of the ice would be retarded and a mound of glacial deposit accumulated greater or less in proportion to circumstances.
At the same time other portions of the surface, where less resistance was met, would be eroded to a corresponding degree. The exist- ence of the drumlins, and the corresponding depressions and water- courses, are in this way accounted for on a theory at least plausible ; though numerous other theories hardly less plausible are also ad- vanced, and can be found in the text-books (Wright, Ice Age of North America, chap.
What to read after The Centennial Milestone. An Address in Commemoration of the One Hundredth Anniversary of the Incorporation of Quincy, Mass?
You can find similar books in the "Read Also" column, or choose other free books by Adams, Charles Francis, 1835-1915 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
One of the present theories of geologists, and a theory as plausible as any yet suggested, is that these drum- lins were accumulations in the bed of the ice movement of much the same character as those now seen wherever a body of water runs over a comparatively level bottom. In such cases, any obstacle which causes the current to move more slowly in one portion of the channel than in another, will lead to an accumulation of soil or ma- terial at the point of slackening. In this wa)^, wherever, ...after the original surface-soil was removed by the ice-flow, there existed on the surface of the country a ledge or other unusual obstacle, such as an accumulation of boulders more easily surmounted than removed, the movement of the ice would be retarded and a mound of glacial deposit accumulated greater or less in proportion to circumstances.
At the same time other portions of the surface, where less resistance was met, would be eroded to a corresponding degree. The exist- ence of the drumlins, and the corresponding depressions and water- courses, are in this way accounted for on a theory at least plausible ; though numerous other theories hardly less plausible are also ad- vanced, and can be found in the text-books (Wright, Ice Age of North America, chap.
What to read after The Centennial Milestone. An Address in Commemoration of the One Hundredth Anniversary of the Incorporation of Quincy, Mass?
You can find similar books in the "Read Also" column, or choose other free books by Adams, Charles Francis, 1835-1915 to read onlineMoreLess
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