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by George H Fentress
by L W LeRoy
by Joseph R Clair
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alluvium anhydrite anticline Apishapa approximately aquifer Arapahoe formation arkose basal Bear Creek Benton shale Black Hollow field buses calcareous clay conglomerate Creek valley Creek water gap Cretaceous Dakota hogback Dakota sands Dakota sandstone dark gray Denver Basin deposits developed drilling east eastern Colorado electric logs exposed exposures F. M. Van Tuyl fault trace field conference area flank folds foothills belt Fountain formation Fox Hills sandstone Front Range Glennon limestone gneiss Golden Fault Graneros Green Mountain ground water Harriman shale interbedded L. W. LeRoy Laramie formation limestone locally Lykins formation Lyons sandstone medium-grained miles Morrison formation mountain front mudstone oil and gas overlying overturned pediment permeability Pierre shale Precambrian Ralston Creek ranges in thickness reverse fault road cut sandstone member schist siltstone South Platte stratigraphic structure subsurface syncline thin thin-bedded thrust fault Timpas Timpas limestone trend Turkey Creek Turn left Turn right upper Uranium west of Denver zone