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CHAPTER III. Permanence of Continents; Evidence that their Areas
have been Sea Floors. ? Evidence of slow Growth of Mountains. ?
Proof that the Continents are ancient. ? Evidence from Organic
Life; from the Physical Structure of Sediments. ? Devonian Black
Shale. ?Continental Shelf; Conditions of its Formation.?Progressive
Advance in Development of the Continent from Cambrian Time to the
present Day. ? Successive Positions of Shore-line.?Variations in
the Form of Continent; Subsidence during Glacial Period in Northern
Portion; corresponding Uplift in Southern Portion. ? Evidence from
the West Indies Islands; from Florida Rocks ? Summary. Our
preliminary inquiry into the condition of continental growth
appears to indicate that the great lands we term continents are the
result in good part at least of mountain growth. The greater are
substantially consequent on the development of the lesser
elevations. The principal difficulty we encounter in this
hypothesis is that it does not provide us with a beginning. It does
not tell us why at certain points on this earthy ball mountains
grow, and by the growth of their pedestals and foldings lift a
portion of the earth's surface above the plane of the sea. It is
something, however, if we esteem the inquiry sufficiently
successful to show us in a general way that the two types of
irregularities of the earth's surface, the continental masses and
the mountains, are due to one and the same mode of action. The next
problem before us concerns the measure of permanence of these
important reliefs which in the form of the dry lands afford the
principal theatre of" the higher realms of life. On this point the
opinions of students of the earth are still somewhat divided. When
geologists found that near the summits of many of the hig...
General Books LLC
|Country of origin:
Nathaniel Southgate Shaler
||229 x 152 x 13mm (L x W x T)
||Paperback - Trade
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