. Elements of geology : a text-book for colleges and for the general reader. Geology. TERTIARY PERIOD. 505 the junction of the same with the Cretaceous. The whole low-coun- tries of the Southern Atlantic States and the whole of Florida were then a sea-bottom. The Gulf of Mexico was far more extensive than now, and especially it sent a wide bay northward to the mouth of the Ohio- The Mississippi Kiver below that point did not then exist. The Ohio, Arkansas, and Red Rivers emptied by separate mouths into the embay- ment of the Gulf. This was at the beginning. During the course of the Tertiary th
. Elements of geology : a text-book for colleges and for the general reader. Geology. TERTIARY PERIOD. 505 the junction of the same with the Cretaceous. The whole low-coun- tries of the Southern Atlantic States and the whole of Florida were then a sea-bottom. The Gulf of Mexico was far more extensive than now, and especially it sent a wide bay northward to the mouth of the Ohio- The Mississippi Kiver below that point did not then exist. The Ohio, Arkansas, and Red Rivers emptied by separate mouths into the embay- ment of the Gulf. This was at the beginning. During the course of the Tertiary the shore-line was gradually transferred eastward along the Atlantic, and southward along the Gulf, as shown by the dotted lines introduced in the Tertiary areas in the map on page 291. In the interior, in the region of the Plains, the Plateau, and the Basin, there were at different times immense fresh-icater lakes. The places of some of these are indicated on map, Fig. 844,, in dotted out-. Fig. 844.—Map of Tertiary Times, showing Outline of Coast and Places of Principal Tertiary Lakes. line. These outlines, however, are not intended to be accurate. These lakes drained some of them into the Mississippi, some into the Colo- rado, and some into the Columbia River. The Pacific shore-line at that time was along the foot-hills of the Sierra Range, and therefore the whole region occupied by the Coast Ranges and the Sacramento and San Joaquin Valleys, and also portions of Western Oregon, were then a sea-bottom. These facts are roughly represented on map, Fig. 844. The positions of the principal mount- ain-chains, e. g., Sierra, Wahsatch, Uintah, the eastern border of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
