Distribution And Origin of Life in America
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Katzer's view, already alluded to, according to which the Amazon drainage only changed eastward in later Tertiary times, appears to me to agree better with the zoogeographical features of eastern South America. Professor Boettger * looked upon the Pebas beds as being of Oligocene, possibly Eocene age. The fresh-water fish fauna of the Pacific slopes of southern Ecuador still exhibits such affinity to that of the Amazon that the Ecuador mountains could only have had a slight elevation until comp...aratively recent geological times.
Hence we may assume that the Pacific extended to the neigh- bourhood of Pebas when thes:e brackish water beds were laid down.
An interesting zoogeographical demonstration of the * Boettger, O., "Die Tertiarfauna von Pebas," p. 503.
• HISTOEY OF EIVER AMAZON 361 gradual elevation and consequent slow change of the marine character of an ancient lagoon is afiorded by Lake Titicaca on the borders of Peru. This lake, with a length of eighty miles, lies in a mountain valley over 12,000 feet above sea- level, and occupied not long ago a much larger area.
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You can find similar books in the "Read Also" column, or choose other free books by Robert Francis Scharff to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Katzer's view, already alluded to, according to which the Amazon drainage only changed eastward in later Tertiary times, appears to me to agree better with the zoogeographical features of eastern South America. Professor Boettger * looked upon the Pebas beds as being of Oligocene, possibly Eocene age. The fresh-water fish fauna of the Pacific slopes of southern Ecuador still exhibits such affinity to that of the Amazon that the Ecuador mountains could only have had a slight elevation until comp...aratively recent geological times.
Hence we may assume that the Pacific extended to the neigh- bourhood of Pebas when thes:e brackish water beds were laid down.
An interesting zoogeographical demonstration of the * Boettger, O., "Die Tertiarfauna von Pebas," p. 503.
• HISTOEY OF EIVER AMAZON 361 gradual elevation and consequent slow change of the marine character of an ancient lagoon is afiorded by Lake Titicaca on the borders of Peru. This lake, with a length of eighty miles, lies in a mountain valley over 12,000 feet above sea- level, and occupied not long ago a much larger area.
What to read after Distribution And Origin of Life in America?
You can find similar books in the "Read Also" column, or choose other free books by Robert Francis Scharff to read onlineMoreLess
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