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Pennsylvanian Subsystem in the Illinois Basin

机译：伊利诺伊盆地的宾夕法尼亚子系统

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摘要

Pennsylvanian rocks are at the bedrock surface in the Illinois Basin, which covers most of central and southern Illinois, southwestern Indiana, and part of western Kentucky. The lower contact is a regional unconformity, incised into rocks ranging in age from Ordovician to Late Mississippian. Morrowan rocks are confined to the southeastern part of the basin, the bottoms of deep paleovalleys, and a small outlier at the northwest corner. Characteristic rocks are clean quartz sandstone (quartz arenite), siltstone, shale, lenticular coal, and rare limestone. Atokan rocks show a transition from quartz arenite to lithic arenite, and progressively wider depositional extent as valleys on the sub-Pennsylvanian surface were filled. Cyclic sedimentation became prominent during the Desmoinesian, with regionally extensive mineable coal seams and layers of marine limestone and black phosphatic shale. Similar patterns prevailed through Missourian and Virgilian time, except that coal beds are generally thinner and limestone beds thicker. Lower Permian rocks are confined to a small down-faulted outlier in Kentucky.
机译：宾夕法尼亚州的岩石位于伊利诺伊州盆地的基岩表面，覆盖了伊利诺伊州中部和南部的大部分地区，印第安纳州西南部以及肯塔基州西部的部分地区。下部接触是区域不整合面，切成年龄从奥陶纪到密西西比晚期的岩石。 Morrowan岩石被限制在盆地的东南部，深古卵谷的底部以及西北角的一个小离群值。典型的岩石是干净的石英砂岩（石英砂岩），粉砂岩，页岩，透镜状煤和稀有石灰石。 Atokan岩石显示出从石英砂岩到板状砂岩的过渡，并且随着亚宾夕法尼亚岩石表面上的山谷被填满，沉积范围逐渐扩大。在Desmoinesian时期，周期性沉积变得十分突出，该区域有广泛的可开采煤层以及海洋石灰岩和黑色磷页岩层。在密苏里州和维吉尔时期普遍存在类似的模式，除了煤层通常更薄，石灰岩层更厚。下二叠纪岩石被限制在肯塔基州的一个向下断裂的小离群值。

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