Publications
Filter Total Items: 928
Lanthanide element mobility and Sm-Nd systematics in a contact metamorphic zone Lanthanide element mobility and Sm-Nd systematics in a contact metamorphic zone
No abstract available.
Authors
Brian D. Marshall, Kiyoto Futa
Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado
The Lower Permian Schoolhouse Member of the Maroon Formation forms a partly exhumed petroleum reservoir in the Eagle basin of northwestern Colorado. The Schoolhouse consists mainly of yellowish gray to gray, low-angle to parallel bedded, very fine to fine-grained sandstone of eolian sand-sheet origin; interbedded fluvial deposits are present in most sections. Geological and geochemical...
Authors
Samuel Y. Johnson, Christopher J. Schenk, D. L. Anders, Michele L. Tuttle
Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado
The Piceance basin is a hydrocarbon-rich province that has natural gas production from reservoirs ranging in age from Late Jurassic to Eocene and large undeveloped resources of natural gas in coal beds and tight sandstone reservoirs of Cretaceous age. Gases from all producing intervals are of predominantly thermal origin and become isotopically heavier (delta isotope{13}C[1]: -51.3 to...
Authors
Ronald C. Johnson, Dudley D. Rice
Coal and peat in the sub-Saharan region of Africa: alternative energy options? Coal and peat in the sub-Saharan region of Africa: alternative energy options?
Increased energy demand as a result of growth in population, trends to sedentation and urbanization, and the desire for improvement in living standards, coupled with apparent climatic changes, are reducing fuelwood availability and contributing to deforestation and desertification in the sub‐Saharan countries. In 14 of those countries, the transport, industrial, and electric power...
Authors
Jean Noe Weaver, Edwin R. Landis
Mineral resources of the Mount Pennell Wilderness Study Area, Garfield County, Utah Mineral resources of the Mount Pennell Wilderness Study Area, Garfield County, Utah
No abstract available.
Authors
Russell F. Dubiel, C. S. Bromfield, S. E. Church, W. M. Kemp, M. J. Larson, Fred Peterson, C. T. Pierson, D. D. Gese
Dinosaurs, pollen and spores, and the age of the Ojo Alamo Sandstone, San Juan Basin, New Mexico Dinosaurs, pollen and spores, and the age of the Ojo Alamo Sandstone, San Juan Basin, New Mexico
The Ojo Alamo Sandstone of the San Juan Basin of New Mexico is composed of interbedded conglomeratic sandstone, sandstone, siltstone, and mudstone. Conglomerates are found in the western part of the basin; siliceous pebbles diminish in size both southward and eastward across the basin, becoming rare to nonexistent in the eastern part. There is great variation in the internal stratigraphy...
Authors
James E. Fassett, S. G. Lucas, F.M. O’Neill
The ages of the continental, Upper Cretaceous, Fruitland Formation and Kirtland Shale based on a projection of ammonite zones from the Lewis Shale, San Juan Basin, New Mexico and Colorado The ages of the continental, Upper Cretaceous, Fruitland Formation and Kirtland Shale based on a projection of ammonite zones from the Lewis Shale, San Juan Basin, New Mexico and Colorado
The Kirtland Shale or Fruitland Formation directly underlies the Cretaceous-Tertiary boundary throughout most of the San Juan Basin of northwest New Mexico and southwest Colorado. These formations have been known to be Late Cretaceous in age since the early 1900s. Now, with the greatly renewed interest in rocks adjacent to mass extinction boundaries, it is important to place more precise...
Authors
James E. Fassett
Possible Late Middle Ordovician organic carbon isotope excursion: Evidence from Ordovician oils and hydrocarbon source rocks, mid-continent and east-central United States Possible Late Middle Ordovician organic carbon isotope excursion: Evidence from Ordovician oils and hydrocarbon source rocks, mid-continent and east-central United States
Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relatively high abundance of n-alkanes with carbon numbers less than 20, a strong predominance of odd-numbered n-alkanes between C10 and C20, and relatively small amounts of branched and cyclic alkanes...
Authors
Joseph R. Hatch, Stephen R. Jacobson, Brian J. Witzke, J. Bruno Risatti, Donald E. Anders, W. Lynn Watney, K. David Newell, April K. Vuletich
Migrated seismic-reflection lines, eastern Aleutian trench Migrated seismic-reflection lines, eastern Aleutian trench
No abstract available.
Authors
John J. Miller, Roland E. von Huene