The Origin of Gumbotil

摘要: The name gumbotil' was proposed recently for clays of distinctive characters which lie on glacial till and are related closely to till. As originally defined, gumbotil is "a gray dark colored, thoroughly leached, non-laminated, deoxidized clay, very sticky breaking with starchlike fracture when wet, hard tenacious dry, chiefly the result weathering drift. intended suggest nature material its origin." In Iowa there Nebraskan, Kansan, Illinoian drifts. It has not been developed Iowan drift nor Wisconsin