A Second Visit to the United States of North America V.1
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chap. 9.
Chap. V.] MIGRATION OF PLANTS. 71 less obvious to any naturalist who has studied the structure of North America, and observed the wide area occupied by the modern or glacial deposits before alluded to,* in which marine fossil shells of living but northern species are entombed. It is clear that a great portion of Canada, and the country surround- ing the great lakes, was submerged beneath the ocean when recent species of moUusca flourished, of which the fossil remains occur more than 50...0 feet above the level of the sea near Mon- treal. I have already stated that Lake Champlain was a gulf of the sea at that period, that large areas in Maine were under water, and, I may add, that the White Mountains must then have constituted an island, or group of islands. Yet, as this period is so modern in the earth's history as to belong to the epoch of the existing marine fauna, it is fair to infer that the Arctic flora now contemporary with man was then also estab- lished on the globe.
A careful study of the present distribution of animals and plants over the globe, has led nearly all the best naturalists to the opinion that each species had its origin in a single birth-place, and spread gradually from its original center, to all accessible spots fit for its habitation, by means of the powers of migration given to it from the first.
What to read after A Second Visit to the United States of North America V.1?
You can find similar books in the "Read Also" column, or choose other free books by Lyell, Charles, Sir, 1797-1875 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
chap. 9.
Chap. V.] MIGRATION OF PLANTS. 71 less obvious to any naturalist who has studied the structure of North America, and observed the wide area occupied by the modern or glacial deposits before alluded to,* in which marine fossil shells of living but northern species are entombed. It is clear that a great portion of Canada, and the country surround- ing the great lakes, was submerged beneath the ocean when recent species of moUusca flourished, of which the fossil remains occur more than 50...0 feet above the level of the sea near Mon- treal. I have already stated that Lake Champlain was a gulf of the sea at that period, that large areas in Maine were under water, and, I may add, that the White Mountains must then have constituted an island, or group of islands. Yet, as this period is so modern in the earth's history as to belong to the epoch of the existing marine fauna, it is fair to infer that the Arctic flora now contemporary with man was then also estab- lished on the globe.
A careful study of the present distribution of animals and plants over the globe, has led nearly all the best naturalists to the opinion that each species had its origin in a single birth-place, and spread gradually from its original center, to all accessible spots fit for its habitation, by means of the powers of migration given to it from the first.
What to read after A Second Visit to the United States of North America V.1?
You can find similar books in the "Read Also" column, or choose other free books by Lyell, Charles, Sir, 1797-1875 to read onlineMoreLess
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