Geological Survey Of Illinois -- Amos Henry Worthen. This official state geological survey report (Illinois, 1875), Volume VI, Geology and Paleontology, opens with an introductory letter by A. H. Worthen and presents county-by-county geologic descriptions with a focus on the Coal Measures and economic geology. It lays out Part I on Coal Measures and county geology (Clark; Crawford & Jasper; Lawrence & Richland; Wabash & Edwards) and Part II on Paleontology (Vertebrates and Invertebrates). The text emphasizes Illinois's material resources (especially coal), maps geological formations, and discusses building stone, lime, sandstone, iron ore, brick clay, and salt brines as additional resources. It also critiques exploration methods, warns about the unreliability of shallow oil bore data, and calls for careful, long-term, well-funded exploration within state budget constraints.
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