Geology of Ledges State Park, Boone, Iowa

Osolin, Robert Lyle

doi:10.31274/rtd-180813-237

Cited by 2 publications

(4 citation statements)

References 14 publications

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“…1B and 5A). Osolin (1983) considered this outcrop to be part of the Swede Hollow Formation (middle-upper Desmoinesian stage) based on its position above the Whitebreast Coal and Ardmore Limestone that had been tentatively identified in nearby cores. More recently, however, this outcrop was identified as the Floris Formation (Pope, 2012).…”

Section: Desmoinesian Stratamentioning

confidence: 99%

“…5); (3) litharenite sandstone compositions with an increase in the relative proportion of mica (Fig. 3); and (4) a general paucity of fine-grained interbeds (Table 2; Fitzgerald, 1977;Osolin, 1983;Anderson et al, 1999). Strata at Type 2 localities have generally been interpreted as channel deposits from larger fluvial systems, indicating that the watershed regions were larger compared to those for Type 1 sandstones (Fitzgerald, 1977;Osolin, 1983;Isbell, 1985).…”

Section: Morrowan Timementioning

confidence: 99%

“…3); and (4) a general paucity of fine-grained interbeds (Table 2; Fitzgerald, 1977;Osolin, 1983;Anderson et al, 1999). Strata at Type 2 localities have generally been interpreted as channel deposits from larger fluvial systems, indicating that the watershed regions were larger compared to those for Type 1 sandstones (Fitzgerald, 1977;Osolin, 1983;Isbell, 1985). Furthermore, analyses by Siever and Potter (1956), Fitzgerald (1977), Osolin (1983), and Scal (1990) classify Type 2 sandstones as less compositionally mature than typical Type 1 sandstones, and thus more likely to have been derived at least in part from a crystalline source.…”

Section: Morrowan Timementioning

confidence: 99%

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Lower–Middle Pennsylvanian strata in the North American midcontinent record the interplay between erosional unroofing of the Appalachians and eustatic sea-level rise

et al. 2017

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Morrowan, Atokan, and Desmoinesian (Lower-Middle Pennsylvanian) clastic strata in the Forest City (Iowa, northwest Missouri, eastern Nebraska, and Kansas) and Illinois Basins on the North American midcontinent record the interaction between fluctuations in eustatic sea-level and major tectonic events. One of three major Paleozoic eustatic sea-level lows occurred near the Mississippian/Pennsylvanian boundary and was followed by a eustatic rise that continued into Late Pennsylvanian time. Alleghenian mountain building that is linked to the creation of the Pangean supercontinent also began during latest Mississippian time and continued until latest Pennsylvanian or earliest Permian time. Detrital-zircon geochronology and stratigraphic descriptions allow reconstruction of sediment dispersal patterns associated with these events. Our detrital-zircon signatures from Morrowan-lower Desmoinesian strata in the Illinois Basin are interpreted to reflect a change from regional drainages that reworked underlying Mississippian strata to extensive extrabasinal fluvial systems that supplied detritus shed from southeastern New England. By middle Desmoinesian time, detrital-zircon signatures in the Illinois Basin are more similar to those from coeval units in the central Appalachian Basin, indicating a southward shift in the provenance of the fluvial systems. In the Forest City Basin, Morrowan strata are absent and our detrital-zircon data indicate that Atokan-early Desmoinesian sedimentation was dominated by regional fluvial systems that recycled underlying strata. The introduction of extrabasinal fluvial systems with New England headwaters in the middle Desmoinesian coincided with the overtopping of the Mississippi River Arch and depositional linking of the Forest City and Illinois Basins. The Forest City and Illinois Basins collectively contain an Early-Middle Pennsylvanian sedimentary record in the backbulge depozone of the Alleghenian foreland basin system that reflects overtopping of the forebulge located along the Cincinnati Arch and the effects of eustatic sea-level rise. These results lend credence to the previously proposed transcontinental fluvial systems during late Paleozoic time and help to better constrain their courses.

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Section: Desmoinesian Stratamentioning

confidence: 99%

Section: Morrowan Timementioning

confidence: 99%

Section: Morrowan Timementioning

confidence: 99%

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Lower–Middle Pennsylvanian strata in the North American midcontinent record the interplay between erosional unroofing of the Appalachians and eustatic sea-level rise

et al. 2017

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“…More recently, Palmquist and Bible (1975) have presented evidence that the Des Moines River was determined by the shape of the Cary lobe of the Wisconsin glaciation. Osolin (1983) presents two hypotheses. The first is that the Des Moines River formed prior to deglaciation as a subglacial meltwater channel.…”

Section: Geologymentioning

confidence: 99%

The vegetation of Ledges State Park, Boone County, Iowa

Johnson-Groh

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Lowland alluvial flats Oak-Birch-Planetree Wet-mesic Lowland mixed floodplain Maple-Hackberry-Elm-Ash Mesic Upland mesic climax Maple-Linden Mesic-dry Upland mesic-dry climax Oak-Linden Upland mesic-dry successional Aspen Upland mesic-dry northern forest Pine-Fir-Birch Dry Upland dry climax Oak-Hickory Upland dry savanna Oak-Savanna Upland dry successional Cedar Glade/Mixed Shrub Ranunculus which distingUish the floodplain community. The north-facing slope was dominated by Acer nigrum, Tilia americana, and Carya cordiformis, with Hepatica acutiloba and Mitella diphylla common in the herbaceous layer. Cahayla-Wynne (1976) and Cahayla-Wynne and Glenn-Lewin (1978) defined five dominance types in forests of northeast Iowa listed here in order of decreasing mesophytism. Acer type was dominated by ~. saccharum with Tilia americana and Quercus alba secondary in importance. This type was usually found on the most mesic and oldest sites. Tilia type was dominated by T. americana with lesser amounts of Carya cordiformis, Acer saccharum, and Quercus rubra, and was found on undisturbed mesic sites. Quercus rubra type was found in mesic sites with Acer saccharum of secondary importance. Quercus alba type was Cenozoic Quaternary Holocene (Recent Pleistocene (Glacial)

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Geology of Ledges State Park, Boone, Iowa

Cited by 2 publications

References 14 publications

Lower–Middle Pennsylvanian strata in the North American midcontinent record the interplay between erosional unroofing of the Appalachians and eustatic sea-level rise

Lower–Middle Pennsylvanian strata in the North American midcontinent record the interplay between erosional unroofing of the Appalachians and eustatic sea-level rise

The vegetation of Ledges State Park, Boone County, Iowa

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