Travels In North America, In The Years 1841-2; With Geological Observations On The United States…

Paperback | October 12, 2012

bySir Charles Lyell

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt: ... generally destitute of organic remains, but in a few places contains them in abundance. In order to show the identity of the fossiliferous and non-fossiliferous portions of this formation, it will be necessary to enter into some details, which may not be without interest to the geologist who considers in how much obscurity all phenomena bearing on the glacial period is still involved. Travelling from the south-west, I found no shells in the drift till I reached Montreal, which stands at the base of a mountain rising abruptly from a broad plain where the valleys of the St. Lawrence and the Ottawa meet. This mountain, which is 740 feet high above the St. Lawrence, terminates in two summits, one considerably higher than the other, and capped, as before stated, with a mass of greenstone about eighty feet thick. The subjacent beds of Silurian limestone are traversed by dykes and veins of trap. At the base of the hill, on its eastern side, in the suburbs of Montreal, we find clay and sand (rf, e, fig. 13) above 100 feet deep, in which marine shells occur. This deposit fortns a terrace which ends abruptly in the steep bank (e) facing the river-plain, and running parallel to it for three or four miles. It varies in height from 50 to 150 feet, and at its base is a low flat of more modern gravel (/), rising from ten to twenty feet above the St. Lawrence. In certain places, as at the Cdte St. Pierre, on the road from Montreal to Lachine, the surface of the terrace slopes from e to d, or towards the mountain. A good section of this modern deposit was to be seen at the Tanneries, a village in the parish of St. Henri in the Section of Montreal mountain, with shelly drift at its base. A. Silurian limestone. B. Trap or greenstone. c. Dykes of basaltic...

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1845 edition. Excerpt: ... generally destitute of organic remains, but in a few places contains them in abundance. In order to show the i...

Format:PaperbackDimensions:64 pages, 9.69 × 7.44 × 0.13 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217411029

ISBN - 13:9780217411028

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