. Geological report on Monroe County, Michigan. the center of the belt. In passing northeast-ward from Dentons to Goodells, west of Port Huron, the Arkonarises seven feet o\\ing to a differential uplift. In this vicinity theForest has an elevation of 92 feet above Erie (065 above tide, accord-ing to Spencer) and if we assume the same differential movement theForest in Wayne, Washtenaw and Monroe counties would have anelevation of 85 feet above Erie, or 658 feet above tide. As the ice front retreated from the Port Huron moraine, beyondthe place at which the Arkona outlet had been opened, it mad
. Geological report on Monroe County, Michigan. the center of the belt. In passing northeast-ward from Dentons to Goodells, west of Port Huron, the Arkonarises seven feet o\\ing to a differential uplift. In this vicinity theForest has an elevation of 92 feet above Erie (065 above tide, accord-ing to Spencer) and if we assume the same differential movement theForest in Wayne, Washtenaw and Monroe counties would have anelevation of 85 feet above Erie, or 658 feet above tide. As the ice front retreated from the Port Huron moraine, beyondthe place at which the Arkona outlet had been opened, it made itsnext halt and slight readvance along a line extending from thepoint of the thumb, northwestward through Harrisville and Al-cona, in a curve to Petoskey, depositiAg the Alcona moraine. Asthe ice moved down the northern slope of the thumb a series oftemporary outlets were opened into the Saginaw valley, and finallythe waters in front of it thereafter known as Lake Warren becameconfluent with Those of Lake Saginaw. (See Part II of this vol-. THE GLACIAL EPOCH IN SOUTHEASTERN MICHIGAN. 141 ume, Geology of Huron county, Fig. 4, Plate VIII.) According tothe observations of Gilbert, Taylor and Lane tbe Forest Beach inthis northern region is characteristically double, showing two welldefined gravel and sand i i(l;^( s, with a difference in level of eightto fifteen feet. In the southeastern part of the state it is very prob-able that similar beach ridges were also formed, which were latercovered by shifting sand and completely obscured. The shape ofLake Warren during this stage was such that with a prevailingnortheast wind the waves would strike with greater force upon theshelving southeastern Michigan, than upon the greater amount of sand would thus be tossed up by the wavesand carried inland. The common outlet of the Saginaw and Warrenlakes is known to have been through the Pewamo channel, extend-ing from Maple Rapids, by Pewamo, Muir, and Ionia to the GrandRiver
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