. Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois . Sandstone, sandy greenish shale in solution cavities. Limestone, gray to buff. Cystodictya, Stropheodonta, Spirifer. Bioherm with Hexagonaria, Cystphyllum, Favosites, Cladopora, and Atrypa common Limestone, gray to buff, dolomitic, with abundant crinoids and some micro-conglomerate. Many stromatoperoids and bryozoa with fossils 1isted above. Limestone, greenish-gray to buffish-gray, fine grained, argillaceous, massive, weathers readily, oblique joints prominent. Relatively few fossils. Fossils p
. Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois . Sandstone, sandy greenish shale in solution cavities. Limestone, gray to buff. Cystodictya, Stropheodonta, Spirifer. Bioherm with Hexagonaria, Cystphyllum, Favosites, Cladopora, and Atrypa common Limestone, gray to buff, dolomitic, with abundant crinoids and some micro-conglomerate. Many stromatoperoids and bryozoa with fossils 1isted above. Limestone, greenish-gray to buffish-gray, fine grained, argillaceous, massive, weathers readily, oblique joints prominent. Relatively few fossils. Fossils present but not abundant. Limestone, greenish-gray to grayish-brown, fine grained, argillaceous to shaley partings, weathers easily, fossi1iferous. Atrypa, Strophodonta, Leptostrophia, Chonetes, Spirifer, Schizophoria, Pentamerello, He!iophyllum, Cystiphyllum, Favosites, Productella, also crinoidal. Limestone, grayish-brown, sublithographic to fine grained, weathers with brown splotches, very fossiliferous. Astreospongia, Stromatoporoids, Heliophyllum, Favosites. Limestone, very light gray, lithographic to sublitho- graphic, brecciated, pyritic sandy streaks. Grades down to brownish-gray lithographic limestone. Limestone, very light gray to light gray, lithographic to sublithographic, hard, brecciated to bedded. Limestone, brown to brownish-gray, sublithographic with thin light-colored laminae. Limestone, brownish-gray, sublithographic, fractures often calcite filled, some pyrite. Limestone, gray, lithographic, contorted bedding, brecciated. Limestone, light buff, very fine grained, dolomitic, wavy bedded, mostly thin bedded and slabby. Limestone, blue-gray to brownish-gray, medium to coarse grained, thin dark wavy laminae at top, locally brecciated; dolomite in lower part, cavities numerous with crystals of pyrite, calcite, and quartz. Figure 11. Stop 1. Collinson Stone Company quarry stratigraphic section. NW Sec. 24, T. 17 N., R. 2W., Rock Island County, Illinois. From 31st T
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