. Elements of geology : a text-book for colleges and for the general reader. Geology. 504 CENOZOIC ERA—AGE OF MAMMALS. partly the same locality as the Miocene White River basin, but more extensive, reaching southward in patches almost to the Gulf, and north- ward into British America. 2. In Oregon also there is a Pliocene basin, occupying partly the same region as the previous Miocene. 3. Another discovered by Cope in the basin of the Eio Grande. 4. According to King, the Oregon and Nevada lake-deposit was in Pliocene times greatly extended, so as to cover the whole Basin region, but has been
. Elements of geology : a text-book for colleges and for the general reader. Geology. 504 CENOZOIC ERA—AGE OF MAMMALS. partly the same locality as the Miocene White River basin, but more extensive, reaching southward in patches almost to the Gulf, and north- ward into British America. 2. In Oregon also there is a Pliocene basin, occupying partly the same region as the previous Miocene. 3. Another discovered by Cope in the basin of the Eio Grande. 4. According to King, the Oregon and Nevada lake-deposit was in Pliocene times greatly extended, so as to cover the whole Basin region, but has been largely removed by erosion or covered by Quaternary deposits. All these deposits are imperfectly lithified sand and clays in nearly horizontal position, and many of them have been worn by erosive agen- cies in the most remarkable way, sometimes into knobs and buttes like potato-hills on a large scale, sometimes into castellated and pinnacled forms, which resemble ruined cities. These are the " Mauvaises Terres " or " Bad Lands " of the West (Fig. 843).. Fig. 843.—Mauvaises Terres, Bad Lands (after Hayden). On the Pacific coast, a large portion of the Coast Ranges from Southern California to Washington is Tertiary, as are also in many places the lowest foot-hills of the Sierras. Physical Geography.—From what has been said of the distribution of the rocks of this age, it is easy to reconstruct in a general way the physical geography of the American Continent during the early Ter- tiary period. In the northern part the Atlantic shore-line was prob- ably beyond the present line, for there is no Tertiary deposit visible there. The shore-line of that time crossed the present shore-line in New Jersey, then passed along the line of junction of the Tertiary with the Metamorphic, its waves washing primary shores all along the At- lantic coasts, as it does now in the northern portion only; then along. Please note that these images are extracted from scanned page
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
