History of Bay County, Michigan, and representative citizens; . ma, 100 feet; Gypsum, 300; Marshallsandstone, 75; Coldwater shales, 800: Bereasandstones, 65; Antrim shales, 225; Traversegroup, 350; Dundee limestone, 100; Monroebeds, 700, etc. The State geologist deploresthe fact that out of the numerous deep wellsput down in Bay County, only a few have pre-served records of the rock formations trav-ersed. The deepest hole in Michigans surface,aside from the deep copper mines of the UpperPeninsula, was the drill for rock salt of theNorth American Chemical Company in theSouth End, which reached

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History of Bay County, Michigan, and representative citizens; . ma, 100 feet; Gypsum, 300; Marshallsandstone, 75; Coldwater shales, 800: Bereasandstones, 65; Antrim shales, 225; Traversegroup, 350; Dundee limestone, 100; Monroebeds, 700, etc. The State geologist deploresthe fact that out of the numerous deep wellsput down in Bay County, only a few have pre-served records of the rock formations trav-ersed. The deepest hole in Michigans surface,aside from the deep copper mines of the UpperPeninsula, was the drill for rock salt of theNorth American Chemical Company in theSouth End, which reached a depth of over3,500 feet before work on it was was found for 120 feet; coal measures,444; then 20 feet of limestone; and at a depthof 586 feet the flow of 85 per cent, brine. Thencame sandrock down to 635 feet; sandy shalefor the next 25 feet; blue shale for 40 feet;and at a depth of 712 feet came 10 feet ofgypsum. Then came 98 feet of blue shale; 10of hard limerock, 80 of sandstone, and there,at a depth of 920 feet, the second flow of

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