From abstract: This report is about six gas samples that were obtained from the Mississippian Leadville Limestone in the McElmo field, Colorado, and the Lisbon field, Utah. These samples were recorded to contain a high reading of carbon dioxide and the report investigates these results.

From abstract: In the Sawatch, Mosquito and Front Ranges of central Colorado and the Sangre de Cristo Mountains of south-central Colorado, Tournaisian beds of the Mississippian Leadville Limestone overlie rocks of Early Mississippian and Late Devonian age. In the Sangre de Cristo Mountains in north-central New Mexico, the oldest beds are the Tournaisian (zone 9) Espiritu Santo Formation. In west-central New Mexico, in the Magdalena, Lemitar, and Ladron Mountains, the Kelly Limestone of Tournaisian and Visean age rests unconformably on Proterozoic metamorphic and igneous rocks. This report examines the stratigraphy of this area.

From introduction to each respective report: Report J summarizes the results of several studies concerning the stratigraphy and sedimentology of uppermost Jurassic to lowermost Upper Cretaceous rocks in the San Juan basin and adjacent areas. Report K describes using X-ray diffraction techniques to determine the occurrence and distribution of clay minerals in the upper part of the Brushy Basin Member and in the Burro Canyon Formation in the Four Corners area.

From introduction: The investigation described herein is a part of the USGS Evolution of Sedimentary Basins Program. This report concerns the Pennsylvanian and Permian stratigraphic framework, structural development, and paleogeography of the San Juan Basin.

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.

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.

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.

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.

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.

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.

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.