VI.—The Glacial Phenomena of North America, as studied in Long Island, New York, U.S.

Extract

Having resided for some years past on Long Island, the terminal moraine of the Great American continental glacier, and having given considerable attention to the drift phenomena, I am convinced that no oscillation of the continent has taken place subsequent to the Glacial period; and that the river kames, with their assorted gravel, etc., can be accounted for, without resorting to any such doubtful interpretations. I am aware that the presence of shells in the Boulder-clay argues in its favour; but that shells become mixed with the drift while the glacier is in motion is evident from what Prof. Geikie saw in Scandinavia. I will now try in a brief way to give your readers the result of my observations; and, though the sketch may be somewhat crude and imperfect, it may serve to throw a little light on this difficult problem.