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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
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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