Page:Popular Science Monthly Volume 62.djvu/477

Rh, with the assent of Professors Salisbury and Calvin. To give all the reasons upon which these views are based is to repeat the already voluminous discussion, and we must content ourselves with the conclusions only.

According to Professors Winchell and Upham, the material covering the skeletons was deposited during the time of the fourth recrudescence or southward extension of the glaciers in the United States, in that stage known as the Iowan, that is, during the next to the last glacial extension which reached as far south as central Iowa. Under

 with the Concannon residence in background. The skeleton was found nearly below the place indicated by the larger light spot at the right of the trees. From a photograph by Professor Chamberlin.

this view, the valley of the Missouri River was at this time filled to a depth of a hundred feet or more, but has since been excavated to its present level, and the material covering the Lansing skeleton is a part which has not since been carried away. In support of this view, it is claimed that the material covering the skeleton is of the character of glacial loess; that it shows evidence of water stratification; and that there is no evidence to prove that there has been any subsidence of the valley subsequent to glacial time.