Mesaverde Group sandstone units in 13 closely-spaced wells in the central and southern Piceance Basin of Colorado were correlated utilizing wireline log response quantitatively and qualitatively. Based on these correlations, the environmental subdivisions of the Mesaverde Group were characterized as follows: (1) paralic (upper mixed-marine) zone, occurring in the uppermost Mesaverde Group, includes thick sandstone units which are interpreted to be regionally continuous, (2) fluvial zone, containing point-bars 20 to 30+ ft thick, is interpreted to be correlatable to a maximum of 6800 ft, and (3) paludal zone has insufficient data to adequately characterize the sand units. However, 63 percent of the units are correlatable across at least 139 ft. An approximation of the dimensional characteristics of Mesaverde sandstone units has potential applications in designing hydraulic fracturing treatments and estimating gas reserves more accurately. 15 figures, 2 tables.

PATHWAY simulates the transport of radionuclides from fallout through an agricultural ecosystem. The agro-ecosystem is subdivided into several land management units, each of which is used either for grazing animals, for growing hay, or for growing food crops. The model simulates the transport of radionuclides by both discrete events and continuous, time-dependent processes. The discrete events include tillage of soil, harvest and storage of crops,and deposition of fallout. The continuous processes include the transport of radionuclides due to resuspension, weathering, rain splash, percolation, leaching, adsorption and desorption of radionuclides in the soil, root uptake, foliar absorption, growth and senescence of vegetation, and the ingestion assimilation, and excretion of radionuclides by animals. Preliminary validation studies indicate that the model dynamics and simulated values of radionuclide concentrations in several agricultural products agree well with measured values when the model is driven with site specific data on deposition from world-wide fallout.

Appendices containing data on uranium availability in the Moab Quadrangle to accompany a report on U.S. uranium resources in Colorado and Utah.

Appendices containing data on uranium availability in the Vernal Quadrangle to accompany a report on U.S. uranium resources in Utah.

Appendices containing data on uranium availability in the Greenly Quadrangle to accompany a report on U.S. uranium resources in Colorado.

Appendices containing data on uranium occurrences and analyses from the Lamar Quadrangle, in addition to petrographic descriptions of samples.

Appendices containing data on uranium occurrences in the Pueblo Quadrangle to accompany a report on U.S. uranium resources in Colorado.

Appendices containing data on uranium availability in the Cortez Quadrangle to accompany a report on U.S. uranium resources in Colorado and Utah.

Appendices containing data on uranium availability in the Shiprock Quadrangle to accompany a report on U.S. uranium resources in New Mexico, Arizona, Colorado, and Utah.

Appendices containing data on uranium availability in the Aztec Quadrangle to accompany a report on U.S. uranium resources in New Mexico and Colorado.

Appendices containing data on uranium availability to accompany a report on U.S. uranium resources in the Craig Quadrangle, Colorado.

Appendices containing supplementary analytical data of uranium occurrences, chemical analyses of stream-sediment, rock, and soil samples, and tabulated radiometric and gamma-ray anomaly data to accompany a report on U.S uranium resources in the Leadville Quadrangle, Colorado.

Appendices containing data on uranium availability in the La Junta Quadrangle to accompany a report on U.S. uranium resources in Colorado and Kansas.

Appendix containing data on uranium resources in the Trinidad Quadrangle to accompany a report on U.S. uranium resources in Colorado.

Appendices containing data on uranium occurrences in the Rawlins Quadrangle in addition to emission spectroscopy results, electric and gamma-ray logs, lithologic logs and petrology reports to accompany a report on U.S. uranium resources in Wyoming and Colorado.

Annual report of the Rio Grande Compact Commission describing goals and activities during their annual meeting and the previous year as well as tabular data and other statistics related to the management of the Rio Grande River.

Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:100000

From abstract: The High Plains Regional Aquifer System Analysis study has developed a regional water-resources (and related) data storage and retrieval system to organize and preserve areal interpretive data. The system is general and can easily be adapted for other studies. This report documents the High Plains data base as well as the general system that is independent of the High Plains area.

From introduction: This report presents the data collected from six watersheds in northwestern Colorado and describes an initial step in the regionalization of water-quality characteristics and identification of transferability of data from individual, studied watersheds to unstudied watersheds in northwestern Colorado.

From purpose: The purpose of this report is to evaluate the existing sediment-collection network, especially with regard to its capability of detecting changes in sediment transport due to mining.

From Introduction: "The Rawlins Quadrangle (2º) is in south-central Wyoming and extreme northwest Colorado (Fig. 1). Evaluation of the quadrangle was conducted to identify and delineate areas that contain environments exhibiting characteristics common to known uranium-bearing environments."

From Introduction: "The Trinidad Quadrangle, Colorado, was evaluated to identify geologic units and to delineate areas that exhibit characteristics favorable for the occurrence of uranium deposits. All geologic environments were evaluated by means of surface investigations and subsurface data to a depth of 1500 m."

From purpose and scope: The purpose of the National Uranium Resource Evaluation (NURE) program of the U.S. Department of Energy (DOE) is to identify and delineate areas and environments within the Aztec 10X20 Quadrangle, New Mexico and Colorado, that exhibit characteristics favorable for the occurrence of uranium deposits that have the potential to contain at least 100 metric tons U3 08 total endowment with a minimum grade of 100 ppm (0.01 percent) U3 08 . Evaluation is based on geochemical, mineralogic, hydrologic, aerial radiometric, sedimentologic, and general geologic characteristics of the formations in the quadrangle.

From Purpose and Scope of Study: "The purpose of this study is to provide an evaluation of the favorability of the Vernal, Colorado-Utah, 1º x 2º Quadrangle (Fig. 1) for the occurrence of uranium deposits. The study restricted to indicating geologic units and areas favorable for uranium deposits containing at least 100 tons of U3O8 with an average grade of .01 percent U3O8 or more and less than 1,500m (5,000 ft) deep."