Regional geophysical investigations of the Lisbon Valley area, Utah and Colorado

Regional geophysical investigations of the Moab-Needles area, Utah

“…The order of accuracy is, therefore, somewhat lower than that of regional gravity surveys in the U ra van area of Colorado (Joesting and Byerly, 1958) and in the adjoining Lisbon Valley area of Utah and Colorado (Byerly and Joesting, 1959), because of poorer elevation control, and is somewhat higher than that in the adjoining La Sal Mountains area (Case and others, 1963) because of better elevation control.…”

“…1). It is one of a series of regional geophysical studies of the Colorado Plateau, made to gain additional broad-seale information on the depth and configuration of the buried Precambrian basement, and on regional structures that may have influenced the occurrence of uranium, potassiumbearing salts, and oil ( J oesting and Byerly, 1958 ;Byerly and Joesting, 1959;Case and others, 1963). The area discussed here includes The Knoll, Moab, Upheaval Dome, Hatch Point, The Needles, and Harts Point 15-minute quadrangles in parts of Grand, San J nan, V\r ayne, Garfield, and Emery Counties ( fig.…”

“…The Needles fault zone, with topography characterized by tall slender sandstone spires and valleys ·with interior drainage, lies in the south-"·estern part of the area just east of Cataract Canyon of the Colorado River and south of Meander salt anticline. Broad and elongate valleys have formed along (Byerly and Joesting, 1959) (Joesting and Byerly, 1958) area or monoclinal uplift the La Sal Mountains (Case and others, 1963) (Joesting and Case, 1962) The ~{oab-Needles area is in the north-central part of the Colorado Plateau, in the Canyon Lands section of Fenneman (1931). The area is within the Paradox basin, which is characterized by thick Pennsylvanian evapori,tes that locally form the cores of salt anticlines ( fig.…”

Regional magnetic and gravity features of the Gibson Dome area and surrounding region, Paradox Basin, Utah: A preliminary report

“…Compositional and structural trends in Precambrian crystalline basement readily produce identifiable anomalies in the magnetic field as a result of sufficient contrasts in associated magnetizations. These geophysical observations are documented by Byerly and Joesting (1959), Case (1966), Case and Joesting (1961), Case and others (1963), Byerly (1956, 1958), Joesting and Case (1962), and Joesting and others (1966) in their gravity and magnetic studies of subregions within Paradox Basin. Utilizing the results of these studies of localized areas, Case and Joesting (1972a) provided an extensive regional study of Paradox Basin by correlating gravity, magnetic, and geologic data.…”

Incomplete manuscript on stratigraphy and structural geology and uranium-vanadium and copper deposits of the Lisbon Valley area, Utah-Colorado

“…The fault may die out downward within the crumpled thick salt sequence of the Paradox Member of the Hermosa Formation (Pennsylvanian). The aeromagnetic map of the Lisbon Valley area by Byerly and Joesting (1959), which mainly reflects the magnetization and structural alignments of the basement, shows no discordance along the line of the major fault. Neff (1960, p. 60-61; fig.…”