Wetlands have a well-documented capacity for extracting metals, particularly uranium, from ground and surface waters containing only very dilute concentrations of the metals. The plutonic and volcanic rocks of the Colorado Rockies contain uranium concentrations high enough to serve as a uranium source to waters that feed wetlands. Reconnaissance sampling was conducted in 145 montane and subalpine wetlands in Colorado to determine how many of them...

The Oligocene White River Group consists of the Chadron and the overlying Brule Formations in northwestern Nebraska. The Chadron Formation consists of alluvial and colluvial vitric mudstone beds, but in addition contains white persistent layers (purplish-white layers) that probably resulted from soil formation on vitric parent material. West of the current study area a basal sandstone facies of the Chadron is host rock for the Crow Butte uranium...