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| | Indiana Geological Survey Annual Report 1870 |
 | | Millstone Grit: The principal member of this lower division of the coal measures, is a massive sandstone of a redish brown color, strongly charged with small white quartz pebbles near the bottom, is overlaid by arenaceous shales, belonging to the coal-measure series, and underlaid, in places, by a readily decomposing argillaceous shale, and coal. |
 | | A high ridge of millstone grit, here, terminates within a few yards of the East Fork of White river, from the top of which, there is a projecting mass of conglomerate sandstone, called the "Pinnacle," which stands one hundred and seventy feet above the level of the stream. |
 | | at the junction of the millstone grit, and lower carboniferous limestone. |
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