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mineral exploration (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Fruitland Formation
A physical and chemical sedimentary record of Laramide tectonic shifts in the Cretaceous-Paleogene San Juan Basin, New Mexico, USA
A new species of trionychid turtle from the Upper Cretaceous (Campanian) Fruitland Formation of New Mexico, USA
Identification of source carbon for microbial methane in unconventional gas reservoirs
A LATE CRETACEOUS CONIFEROUS WOODLAND FROM THE SAN JUAN BASIN, NEW MEXICO
Hadrosaurid migration: inferences based on stable isotope comparisons among Late Cretaceous dinosaur localities
Geologic controls on transgressive-regressive cycles in the upper Pictured Cliffs Sandstone and coal geometry in the lower Fruitland Formation, northern San Juan Basin, New Mexico and Colorado
Seismic attribute-based characterization of coalbed methane reservoirs: An example from the Fruitland Formation, San Juan basin, New Mexico
Coalbed Gas Systems, Resources, and Production and a Review of Contrasting Cases from the San Juan and Powder River Basins
A gigantic skull and skeleton of the horned dinosaur Pentaceratops sternbergi from New Mexico
3-D AVO analysis and modeling applied to fracture detection in coalbed methane reservoirs
Multicomponent 3-D characterization of a coalbed methane reservoir
Thermogenic and Secondary Biogenic Gases, San Juan Basin, Colorado and New Mexico—Implications for Coalbed Gas Producibility
New data on the ceratopsian dinosaur Pentaceratops sternbergii Osborn from New Mexico
Heat-flow data suggest large ground-water fluxes through Fruitland coals of the northern San Juan basin, Colorado-New Mexico
Thermal maturity patterns of Cretaceous and Tertiary rocks, San Juan Basin, Colorado and New Mexico
Environmental controls related to coal quality variations in the Fruitland Formation, San Juan basin, New Mexico
The New Mexico Bureau of Mines and Mineral Resources (NMBM&MR), with the participation of other individuals, has been involved in a long-term coal quality study. This project was funded by the New Mexico Research and Development Institute (NMRDI) with contributions from several companies. The NMBM&MR has developed a large data set for the San Juan basin coal fields using quality data from this project and data collected from public and private sources through an 11-yr cooperative project with the U.S. Geological Survey (USGS) for entry into the National Coal Resource Data System (NCRDS). The most complete set of quality and thickness data exists for the economically important Fruitland Formation coals. Evaluation of these data suggest that some trends in the attributes of the Fruitland coals exist. The trends appear to support the premise that the characteristics of these coals are a consequence of their depositional environments. These environments were influenced by the relative position of the shoreline and the rate of shoreline movement. The thickness and quantity of the coals and the ash and sulfur content appear to be significantly influenced by their position relative to the shoreline and the rate of shoreline shift. The moisture content and Btu value appear to have been influenced by these same controls, but the degree of coalification of the northern Fruitland Formation coals has also been influenced by the heat from the massive intrusive complexes of the La Plata and San Juan Mountains in southern Colorado.
Compositional controls on natural gas yields from selected Fruitland coals, San Juan Basin, Colorado
A partial skeleton of the tyrannosaurid dinosaur Aublysodon from the Upper Cretaceous of New Mexico
A series of 33 Late Cretaceous (earliest Campanian through Maastrichtian) paleoshoreline maps was developed to document the migrational evolution of the western edge of the North American Western Interior Seaway. The maps represent a geologic span of roughly 18 million years, and portray the estimated positions of the strandline for each standard Western Interior ammonite zone, beginning with the Clioscaphites choteauensis zone and continuing to the end of the Mesozoic. We attempted correlation of all significant mammal-bearing localities known from the Western Interior with the ammonite-based marine zonation. First approximations of correspondence between ammonite zones and North American Land-Mammal “Ages” (NALMAs) include: Lancian ( Sphenodiscus through “Triceratops” zones); “Edmontonian” (a name not yet faunally defined; Didymoceras cheyennense through Baculites clinolobatus zones); Judithian (the smooth, late form of Baculites sp. through Exiteloceras jenneyi zones); and Aquilan ( Scaphites hippocrepis through Baculites asperiformis zones). Correlations emphasize use of provincial biostratigraphic terminology designed specifically for use in the Western Interior. On the basis of temporal constraints suggested herein, known mammalian fossils from the upper Fruitland and/or lower Kirtland Formations of New Mexico probably are of “Edmontonian,” not Judithian age. Although considerable latitudinally based taxonomic diversification of Judithian mammals is now recognizable across the Western Interior, comparative data are inadequate to defend a similar statement for the remaining Late Cretaceous NALMAs. Quantitative evaluation of geographic patterns of shoreline change suggests occurrence of a general, regional regression of the sea during the entire geologic interval represented in the study. We favor explanation by a slow sea-level depression resulting from topographic evolution of the world’s mid-oceanic system of ridges and volcanic plateaus. Local and subregional asynchronous episodes of shoreline transgressions, stillstands, and regressions are superimposed upon the general regressive trend, and probably represent influences of local tectonism, not eustatic changes in sea level. Strandline evolution of the epeiric sea during the last 20 million years of the Cretaceous in the North American Western Interior is inconsistent with: (1) existence of geologically brief (1 to 10 m.y.) global fluctuations in sea level; and (2) the concept that the late Campanian was represented by an unusually high global sea level.