Deep Wells of Nebraska

angular anticline arenaceous argillaceous blue bluish gray brick red brown brownish buff calcareous carbonaceous Carlile Chadron chalky chert City clay coal coarse core correlation COUNTY Creek Cretaceous crinoid crinoid joints Dakota group Dakota sandstone Decorah depth Devonian Dolomite drilled drillers Fauna feet finely crystalline limestone formation fossiliferous fossils Fusulina fusulinids G. E. Condra Geological Survey glauconitic grained Granite granular gray shale gray to dark grayish grayish-green green shale Greenhorn limestone greenish greenish-gray gypsiferous gypsum indurated interbedded Kansas light gray Limestone Limestone and shale limestone member Location lower portion massive medium hard micaceous miles Mississippian MISSISSIPPIAN SYSTEM Missouri Series Moines Series NEBRASKA Elevation Nehawka Niobrara oil and gas Omaha ORDOVICIAN Permian Pierre shale Pre-Cambrian probably pyrite pyritiferous quartz Red rock red shale reddish reported Sandy lime shale fragments shale member shaly Shaly limestone shelly Silurian Sioux quartzite slightly soft thickness thin Triticites upper portion water-bearing