Three Glacial Tills at Ames, Iowa

The observations from which these data were obtained were made in an excavation opened for the basement of Wesley Foundation building just south of the athletic field of Iowa State College on Lincoln Way. The uppermost deposit which is found everywhere on the upland in the vicinity of Ames, is the Wisconsin till, most of which at this place had been removed by erosion prior to the beginning of the work. A zone of red soil about two feet thick just beneath this till serves as an unmistakable indicator of the plane of separation between it and the Kansan till below