Page:The Journal of geology (IA journalofgeology11893univers).pdf/350
I may sum up my own views with the statement that I did not see, during eight years of travel and geological observations that extended from the Amazon valley and the coast through the highlands of Brazil and to the head waters of the Paraguay and the Tapajos, a single phenomenon in the way of boulders, gravels, clays, soils, surfaces or topography, that could be attributed to glaciation. A glacial origin for certain gravels has probably been suggested by Derby,[1] because their origin is somewhat obscure, but I am of the opinion that they admit of the same explanation as the high river gravels of the southwestern United States, and that glaciation had nothing whatever to do with them.[2]
John C. Branner.
- ↑ Wappeus' Geographia Physica do Brazil, p. 55.
- ↑ It may have some value as corroborating an opinion formed before studying the geology of the Southern United States, that all the phenomena brought forward in support of the glaciation of Brazil are repeated in the Southern States, far south of what geologists readily recognize as the utmost limits of glacial ice. In Arkansas for example, boulders occur near Little Rock, of such shape, character, and distribution as to strongly suggest a glacial boulder train, if the glaciation of the region were admissible, or another explanation were not evidently the correct one. For an illustration of such boulders see Annual Rep. Geol. Survey of Arkansas for 1890, II., 25.
London, 1886, 424.Three Thousand Miles through Brazil, by J. W. Wells, London, 1886, II, 373-4.Sparks from a Geologist's Hammer, by Alexander Winchell, Chicago, 1887, 180.Notes of a Naturalist in South America, by John Bell, London, 1887, 313-318 and 342.Darwinism, by Alfred R. Wallace, London, 1889, 370.