The Yellowstone National Park, Historical And Descriptive
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The lava outpourings during this period of volcanic activity have given our Park the broad outlines of the form in which we see it to-day, except as this has since been modified by the agencies of denudation and erosion.
The earlier outpourings consisted mainly of andesitic breccias; the later of rhyolite, while all along there were smaller flows of basaltic lavas. The andesitic eruptions played their principal part in the upbuilding of the moun- tains. Over the greater part of the Absaroka and... Gallatin Eanges the older granite and sedimentary rocks were buried beneath the lava, and the modern form of these mountains is that which time has wrought from out the igneous rocks.
These volcanic outbursts were evidently not so much of the character of molten lava as in later times. In many places the heat was not sufficient to consume organic sub- stances, the forms of which have remained intact to the present time. The material was apparently not liquid enough to spread itself about like a lake, but instead banked up in the near neighborhood of eruption and thus promoted the building up of the mountains.
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You can find similar books in the "Read Also" column, or choose other free books by Hiram Martin Chittenden to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The lava outpourings during this period of volcanic activity have given our Park the broad outlines of the form in which we see it to-day, except as this has since been modified by the agencies of denudation and erosion.
The earlier outpourings consisted mainly of andesitic breccias; the later of rhyolite, while all along there were smaller flows of basaltic lavas. The andesitic eruptions played their principal part in the upbuilding of the moun- tains. Over the greater part of the Absaroka and... Gallatin Eanges the older granite and sedimentary rocks were buried beneath the lava, and the modern form of these mountains is that which time has wrought from out the igneous rocks.
These volcanic outbursts were evidently not so much of the character of molten lava as in later times. In many places the heat was not sufficient to consume organic sub- stances, the forms of which have remained intact to the present time. The material was apparently not liquid enough to spread itself about like a lake, but instead banked up in the near neighborhood of eruption and thus promoted the building up of the mountains.
What to read after The Yellowstone National Park, Historical And Descriptive?
You can find similar books in the "Read Also" column, or choose other free books by Hiram Martin Chittenden to read onlineMoreLess
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