Correlative alluvial units described in other studies in the general region of the Ivanpah Valley area have been dated to between about 7500 and 24,000 years e. The book can be purchased from the Nevada Bureau of Mines and Geology or from Amazon. The shear zone is heavily iron oxide stained and contains clear, vitreous quartz veins up to 4 in. Broad age assignments are based on comparison to regional studies of soil and surface characteristics, some with independent sources of age control described in a subsequent section. Units and descriptions for the Red Rock Canyon area are from Loomis and Burbank 1988.
It apparently forms through a complex organo-chemical process that involves dissolution of silica and concurrent incorporation of microbial components Perry et al. Vertical displacements in both drainages are similar, ranging from 7 to 9 m Fig. Landforms of the Basin and Range Province defined for soil survey. Knopf, Adolph, 1917, Tin Ore in Northern Lander County, Nevada: U. Several pegmatite dikes up to 3 ft wide intrude amphibole schist. The geodetic data, therefore, suggest that at latitude ~37. Turn left onto the power-line road and ascend the hills.
Three shafts and several pits and trenches; small, undetermined past production has occurred. Copper ranged from 0,0054% to 0. Spindle diagrams showing diversity of reef-building taxa in the Ediacaran and Cambrian. Numerous studies over the last 20 years have indicated that regulatory models for and approaches to flood hazard assessment on desert piedmonts can produce erroneous results when they ignore geologic information e. Tu—undifferentiated Tertiary; Mg—Mesozoic granitic and gneissic rocks; Jv—Jurassic volcanic rocks; Pz—Paleozoic and Triassic? Increased rainfall associated with climatic gradients near mountain ranges has a profound effect on the distribution and concentration of pedogenic carbonate Gile et al. The rates determined at the offset Furnace Creek and Indian Creek alluvial fans show that this rate decreases to ~2. At least two adits, a deep, inaccessible shaft, and numerous pits and trenches; past production of unknown amounts has occurred.
Most of the visible rocks are Oligocene and Miocene tuffs. Typical active ephemeral wash in unit Qay 3. General Geologic Assessment of Flood Hazards in the Ivanpah Valley Area The surficial geology and geomorphic history of the Ivanpah Valley area lend themselves to a relatively straightforward assessment of relative flood hazards. San Bernardino County, California: Geological Society of America Cordilleran Section 75th Annual Meeting Abstracts, 65 pp. The lenses are as much as 4 ft thick. Geological Survey Open-File Report 77 65B, 6 p. Title: Geologic and natural history tours in the Reno area: Expanded edition Author: Joseph V.
Significant errors can occur when these features are misinterpreted as morphologic stages. Service work most often entails answering queries and interacting with the general public as well as geologists and other professionals from private industry and state and federal agencies. Disseminated pyrite occurs fn quartz and in gouge. Btk horizons occur in granitic parent materials in the southeast part of the study area and contain well developed clay coats and clay bridges between sand grains. This is an undivided map unit comprised of coarse, poorly sorted deposits of angular and subangular boulder-to pebble-gravel on steep bedrock slopes.
A traverse of the skyline to the southeast of the stop yielded 9. Surface morphology, soil development, and relations to regional studies strongly suggest that surfaces in this class have not been subject to alluvial fan processes for at least the last 5000 and more likely the last 7000 to 8000 years. Geological Survey Open-File Report, 13 p. The fault contains a 1-2 in. Thick sections of limestone, sandstone, and shale, similar to rocks of the Grand Canyon, can be found.
When soil water becomes saturated with respect to calcium carbonate, it precipitates within the soil pore spaces. The processes that form planar surfaces, desert pavements, and rock varnish are polycyclic. Stop 12: Fish Lake Valley Fault at Indian Creek Directions. A thorough understanding of the post-Permian tectonic and depositional history greatly aids in unraveling the Late Paleozoic history because it is important to generate an appropriate paleogeography. Active tectonics of the eastern California shear zone scarp is visibly warped by a series of low-amplitude folds west of the Red Ridge fault zone Fig.
Geochronology samples were collected from the top 2—5 cm of large B Figure 19. The vein can be traced for about 225 ft on the surface to where it is lost under alluvium. The Mount Dunfee microbialites incorporate up to 32 wt% detrital quartz within their microstructures. Three meter-scale patch reefs near the top of the Harkless Formation at Site 1 Stop 2. In general, the ages of the alluvial deposits and surfaces are directly related to the duration of time that they have been isolated from active fluvial processes, hence flooding. Continue up the switchbacks onto the alluvial fan surface. A crosscut intersects three guar tz-ca lei te veins and a 50-ft-wide zone of brecciated gneiss rock with disseminated pyrite.
No resource or sanple data is available. Ore consists of quartz with sparse pyrite and is stated to carry 0. Elsewhere Av 4—5 cm thick horizons overlie either Bw 4—10 cm or Bk 2—111 cm horizons. Geological Survey Water-Resource Investigations Report 91-4171, 58 pp. A collapsed working 800 ft along strike from the southwestern outcrop may be on the same vein. Several unusual upper Paleozoic units in this area record depositional environments that were originally west of the Eleana submarine fan system Trexler et al.