The Nautilus, Vol. 20: A Monthly Journal Devoted to the Interests of Conchologists; May, 1906 to April, 1907 (Classic Reprint) - Hardcover

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Excerpt from The Nautilus, Vol. 20: A Monthly Journal Devoted to the Interests of Conchologists; May, 1906 to April, 1907

Loess papers: The Loess of Nachez, Mississippi; The Loess and the Lansing Man; Loess and the Iowan Drift; Evidences of Water-deposition of Loess. By B. Shimek (bull. Lab. Nat. Hist. Iowa State University, V., no. The question of the genesis of the loess of the Mississippi Valley has interested two generations of geologists. Until quite recently the great majority of American writers, and among them Prof. Shimek himself, ascribed its deposition to the action of water. Later studies by Shimek, covering ex posares over practically the whole loess area, caused him to advocate the view that our loess is of jeolian origin. This thesis is dis cussed with great ability, and it is not possible here to give an ade quate outline of the argument. It is shown that the highest and thickest deposits of loess lie along the larger streams, and their deposition by water would require vast inland lakes, of which there are no traces of shore-lines. The fine and homogeneous deposits containing fragile shells unbroken and unworn, are not such as would be deposited by aqueous action. Moreover, fluviatile shells are ah sent, the loess fossils being chiefly land shells, and exceptionally those of small pools. A great mass of evidence, geological and fauna], is brought forward to show that the loess is of the nature of an upland dune formation.

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