In the valley of the Kansas River as well as on the adjacent uplands between Manhattan and Kansas City, Kansas, is a red clay-like deposit of very fine texture and low textural range. Field studies and laboratory investigations consisting of mechanical and mineralogical analyses tend to prove that the upland phase is a very highly weathered till, whereas the terrace deposit is fluviatile in origin, the materials of which have been derived from the upland deposits. No definite age has been assigned to these clays.

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