In March, 1944, the United States Bureau of Mines completed a diamond drill hole near the town of Bourbon in Crawford County, Missouri, at a depth of 1,824 feet.3 The hole was drilled vertically and its angle was measured at 400, 800, 1,200, and 1,600 feet. The hole passed through nearly 1,500 feet of Lower Ordovician and Upper Cambrian sediments before entering pre-Cambrian rhyolite. Core recovery was excellent and it is believed that the stratigraphic information obtained is of sufficient interest to justify the presentation of a detailed log. The Missouri Geological Survey and Water Resources cooperated fully in...

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