Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois earlypennsylvani18lear Year: 1985 1979 Leary: Pennsylvanian Flora, Rock Island County, Illinois 19 Loess, cream to light buff, silt and clay with calcareous concretions. Till and glacial drift. Sandstone, light brown to tan, medium to fine grained with irregular streaks of carbon- aceous shale. Shale, gray, fissile, silty. Coal, impure, shale partings. Shale, dark gray, with silty lenses and thin streaks of sand. Grades from fissile shale in thin beds to blocky claystone in rather massive beds.
Early Pennsylvanian paleotopography and depositional environments, Rock Island County, Illinois earlypennsylvani18lear Year: 1985 1979 Leary: Pennsylvanian Flora, Rock Island County, Illinois 19 Loess, cream to light buff, silt and clay with calcareous concretions. Till and glacial drift. Sandstone, light brown to tan, medium to fine grained with irregular streaks of carbon- aceous shale. Shale, gray, fissile, silty. Coal, impure, shale partings. Shale, dark gray, with silty lenses and thin streaks of sand. Grades from fissile shale in thin beds to blocky claystone in rather massive beds. Mery few fragments of plant fossils. Figure 13. Stop 3. Stratigraphic section at Black Hawk State Park, Rock Island, Illinois.
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