The Iowan Drift a Review of the Evidences of the Iowan Stage of Glaciation a C

William C William Clinton Alden

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2) from nothing to ten feet thick. Overlying this is a bed of rusty brown gravel (Buchanan) (No. 3) which is partly cemented by iron oxide and in which the crystalline pebbles, which range in "Iowa Geological Survey, Vol. V, p. 65, 1895.
14 Leighton, M. M. , An exposure showing post-Kansan glaciation near Iowa City, Iowa: Jour. Geology, Vol. 21, pp. 431-435, 1913. The Pleistocene history of Iowa river valley, north and west of Iowa City in Johnson County: Iowa Geologica" Survey, Vol. XXV, (1914...) pp. 142-146, 1916.
118 THE IOWAX DRIFT size up to one foot in diameter but are mostly less than three inches, are much decayed. The gravel bed is contorted and folded as if by pressure from the northwest. One of the synclinal folds is seven feet deep. Overlying the gravel is yel- lowish, blue-streaked till (lowan) (No. 4) two to four feet thick across the summit and attaining a thickness of at least eight feet along the west monoclinal limb. This till is highly calcareous excepting in the upper few feet where it is leached.

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