General Contents – Fredericktown Quad. Igneous Geology: Stratigraphy – Davis, Fredericktown granite, Lamotte, Potosi, [Precambrian], Silvermine Granite, Skrainka Diabase: Minerals – biotite, chlorite, epidote, feldspar, fluorite, hornblende, lead, labradorite, limonite, magnetite, manganese, orthoclase, plagioclase, potassium feldspar, pyrite, pyroxene, quartz: Lithologies – arkose, basalt, basic rock, breccia, chert, conglomerate, devonite, diabase, dolomite, felsite, gabbro, granite, granodiorite, granogabbro, pegmatite, rhyolite, sandstone: Mines/quarries – diabase quarries, granite quarries, manganese mine, lead/zinc mines; Cuthbertson, Fredericktown Lead, Hill O'Mera, St. Louis Smelting & Refining: Paleontology – [none noted]: [...]