. Surface geology and agricultural conditions of Michigan . he ice during the development of the eskers beneath itsmargin. Their distribution is general and widespread. They areespecially abundant among the rocky knobs of the western half ofthe peninsula. A kame or a kame cluster usually occupies but asmall fraction of a square mile or too small an area to be easilyrepresented on a scale such as that of the general map. (PL I).They are also so numerous that no attempt was made to map themin detail. Like the eskers, kames are of commercial value as roadmaterial^ wherever there is a demand for i
. Surface geology and agricultural conditions of Michigan . he ice during the development of the eskers beneath itsmargin. Their distribution is general and widespread. They areespecially abundant among the rocky knobs of the western half ofthe peninsula. A kame or a kame cluster usually occupies but asmall fraction of a square mile or too small an area to be easilyrepresented on a scale such as that of the general map. (PL I).They are also so numerous that no attempt was made to map themin detail. Like the eskers, kames are of commercial value as roadmaterial^ wherever there is a demand for it. EFFECT OF THE ICE SHEET ON ROCK SURFACES. In regions which have not been overridden by an ice sheet thereis a mantle of soil, rock Avaste and rotten rock several feet deep overthe rock ledges, except where slopes are so steep that it is washedaway. This mantle represents a long period of weathering anddisintegration of the rock surfaces. In regions that have been Michigiui Geological andBiological Survey. Piihiication 25, Geological Series 21,Plate A. STRIATKD I>KDGK ON HILL, SOUTHWEST PART OF CHAMPION,
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