Geological map of Ripley County and adjacent Decatur County, outlining the eastern border of the upper Silurian (excepting east of Laughery Creek), and also the lower Silurian areas along the western creeks
"Plate XVI." Detached from: A report on the geology of the middle and upper Silurian rocks of Clark, Jefferson, Ripley, Jennings and southern Decatur counties, Ind. / August F. Foerste. In Indiana Dept. of Geology and Natural Resources twenty-first annual report, 1896. Indianapolis: Wm. B. Burford, 1897. Page 258. Imprint: [Indianapolis] : [Indiana Dept. of Geology and Natural Resources], [1897] Dimensions: 41 x 27 cm