Pseudo Superglacial Till

A thin layer of coarse till overlies clay-rich till in northwestern North Dakota. That the thin layer is not a superglacial facies of the underlying clayey till is indicated by (i) geomorphic relations; (ii) contrasted lithologies; (iii) restricted area of exposure; (iv) absence of a similar deposit on a younger clayey till in a comparable topographic environment; (v) presence of a probable paleosol; (vi) an intervening unconformity; and (vii) occurrence of clayey facies of the upper deposit. The deposit is believed to represent a younger till.