Geological cross section showing stratigraphy of mineral resources, including various limestone and shale layers. Relative relief in relation to sea level shown by profile. See "Map showing lines of geological sections and the relation of Trenton rock to sea level" for location of profile line. Imprint: [Indianapolis] : [Indiana, Dept. of Geology and Natural Resources], [1894]; Imprint: Indpls : lithographed by William B. Burford, [1894] Dimensions: 15 x 23 cm; Scale: Approximately 1:1,900,800. 30 miles to the inch. Vertical scale approximately 1:6,000. 500 feet to the inch
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