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... This study combines the results of geophysical, geologic, and geochemical investigations to provide a hydrogeologic framework of major aquifer units, identify ground-water flowpaths, and determine source(s) of base flow to the upper Verde River. This introductory chapter provides an overview of prev ...
... This study combines the results of geophysical, geologic, and geochemical investigations to provide a hydrogeologic framework of major aquifer units, identify ground-water flowpaths, and determine source(s) of base flow to the upper Verde River. This introductory chapter provides an overview of prev ...
GEOLOGY OF THE PURCELL SUPERGROUP SOUTHEASTERN
... The Fernie west-half map area is underlain by Middle ProterozoicPurcell Supergroup, Late Proterozoic Windermere and Paleozoic miogeoclinal rocks. The Purcell Supergroup, the main focus of this study, has been affected by tectonic events in Middle and Late Proterozoic, Early Paleozoic and Mesozoic ti ...
... The Fernie west-half map area is underlain by Middle ProterozoicPurcell Supergroup, Late Proterozoic Windermere and Paleozoic miogeoclinal rocks. The Purcell Supergroup, the main focus of this study, has been affected by tectonic events in Middle and Late Proterozoic, Early Paleozoic and Mesozoic ti ...
STP 3 & 4
... et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional pattern h ...
... et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional pattern h ...
STP 3 & 4 2.5S.1 Basic Geologic and Seismic Information
... Coleman et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional p ...
... Coleman et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional p ...
STP 3 & 4 2.5S.1 Basic Geologic and Seismic Information
... Coleman et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional p ...
... Coleman et al. (Reference 2.5S.1-13). It has experienced a net progradation (seaward movement) during the Tertiary and Quaternary periods. Clastic materials derived from the uplands to the north have spread across the shelf as the seas transgressed for more than 66 million years. This depositional p ...
Mineral Belts of Western Sierra County
... The western mineral belt extends southerly along the eastern flank of the Black Range and Mimbres Mountains for approximately 45 miles, from the northern end of the Phillipsburg district a few miles north of the Sierra-Catron County line to the southern end of the Tierra Blanca district (eastern par ...
... The western mineral belt extends southerly along the eastern flank of the Black Range and Mimbres Mountains for approximately 45 miles, from the northern end of the Phillipsburg district a few miles north of the Sierra-Catron County line to the southern end of the Tierra Blanca district (eastern par ...
STRUCTURE AND DEVONIAN STRATIGRAPHY OF
... Sequences of Devonian rocks are advantageously exposed along a unique 40mile-long east-west traverse in the greater Timpahute Range, southeastern Nevada. Study of these rocks casts light upon Devonian paleogeography, the Devonian Antler orogeny, an Upper Devonian cosmolite impact basin, this part of ...
... Sequences of Devonian rocks are advantageously exposed along a unique 40mile-long east-west traverse in the greater Timpahute Range, southeastern Nevada. Study of these rocks casts light upon Devonian paleogeography, the Devonian Antler orogeny, an Upper Devonian cosmolite impact basin, this part of ...
The origin of metamorphic core complexes and detachment faults
... The upper part of the continental crust appears to extend through the operation of normal faults. Early models (Fig. 2) envisaged the transition between the region of brittlely stretching upper crust and the ductilely stretching lower crust as a flat fault. Such models (e.g. see Miller et al. 1983) ...
... The upper part of the continental crust appears to extend through the operation of normal faults. Early models (Fig. 2) envisaged the transition between the region of brittlely stretching upper crust and the ductilely stretching lower crust as a flat fault. Such models (e.g. see Miller et al. 1983) ...
the geology of the burren region, co. clare, ireland
... 3.1. The Burren region in the wider context of the geology of Ireland Ireland’s complex geological history has been evolving for over two billion years. It spans several major orogenies (mountain-building episodes), erosion of great mountain chains, the birth of oceans, and multiple ice ages. For mu ...
... 3.1. The Burren region in the wider context of the geology of Ireland Ireland’s complex geological history has been evolving for over two billion years. It spans several major orogenies (mountain-building episodes), erosion of great mountain chains, the birth of oceans, and multiple ice ages. For mu ...
guide to the geology trail - The Sleeping Giant Park Association
... outcrops located directly on the trail, some may be partially obscured by heavy autumn leaf fall, winter snow and ice, or seasonally active stream flow. Visibility of a few stations may be hampered by dense foliage in summer months. Of course, the number of stations varies from trail to trail and fr ...
... outcrops located directly on the trail, some may be partially obscured by heavy autumn leaf fall, winter snow and ice, or seasonally active stream flow. Visibility of a few stations may be hampered by dense foliage in summer months. Of course, the number of stations varies from trail to trail and fr ...
The crustal structure of the southern Caspian region
... thins rapidly (~20 km thinning over a 100 km zone) and whose eastern boundary has a more gradual change in crustal thickness (~20 km thinning over a 400 km zone). The velocity–depth profiles derived from the receiver functions are compared to laboratory velocity estimates made at pressures and tempe ...
... thins rapidly (~20 km thinning over a 100 km zone) and whose eastern boundary has a more gradual change in crustal thickness (~20 km thinning over a 400 km zone). The velocity–depth profiles derived from the receiver functions are compared to laboratory velocity estimates made at pressures and tempe ...
Guidebook
... event is the Meso-Cretaceous one. It involved the European Continental Margin generating the basement shearing nappes of the Central East Carpathians (Median Dacides) and a part of the oceanic Tethys expressed in obductions above the former (Transylvanidian Nappes). Meso-Cretaceous shortenings are a ...
... event is the Meso-Cretaceous one. It involved the European Continental Margin generating the basement shearing nappes of the Central East Carpathians (Median Dacides) and a part of the oceanic Tethys expressed in obductions above the former (Transylvanidian Nappes). Meso-Cretaceous shortenings are a ...
Guidebook
... of an arc system.(Fig.3) The Kohistan sequence displays a structurally coherent section of an island arc terrane, comprised of a 30 to 40 km thick section of metamorphosed, plutonic, volcanic and sedimentary rocks. This succession is interpreted as plutons intrusive into an oceanic crust and overlai ...
... of an arc system.(Fig.3) The Kohistan sequence displays a structurally coherent section of an island arc terrane, comprised of a 30 to 40 km thick section of metamorphosed, plutonic, volcanic and sedimentary rocks. This succession is interpreted as plutons intrusive into an oceanic crust and overlai ...
Multi-Stage Origin of the Coast Range Ophiolite, Supra-Subduction Zone Ophiolites
... and depositional contacts with overlying Upper Jurassic sediments of the Great Valley Sequence. At other locales, plutonic rocks are scarce, the volcanic rocks are more like “oceanic” basalts (that is, basalts erupted at oceanic spreading centers or within oceanic plates), and contacts with sediment ...
... and depositional contacts with overlying Upper Jurassic sediments of the Great Valley Sequence. At other locales, plutonic rocks are scarce, the volcanic rocks are more like “oceanic” basalts (that is, basalts erupted at oceanic spreading centers or within oceanic plates), and contacts with sediment ...
Geology of East-Central Idaho
... River Mountains, and northern parts of the Lost River, Lemhi and Beaverhead ranges include meta-sandstones and siltites of the Yellowjacket Formation, Lemhi Group, and Swauger Formation of the 1470-1390 Ma Belt Supergroup (Figs. 3, 23, 48-50) (Ruppel, 1975; Aleinikoff et al., 1996; Sears et al., 199 ...
... River Mountains, and northern parts of the Lost River, Lemhi and Beaverhead ranges include meta-sandstones and siltites of the Yellowjacket Formation, Lemhi Group, and Swauger Formation of the 1470-1390 Ma Belt Supergroup (Figs. 3, 23, 48-50) (Ruppel, 1975; Aleinikoff et al., 1996; Sears et al., 199 ...
13 Oxygen Isotopes in Zircon - University of Wisconsin
... Disintegration (EPD), which uses spark discharges of >100 kV to disaggregate a rock, largely along grain boundaries (Rudashevsky et al. 1995, Saint-Eidukat and Weiblen 1996). This technique can preserve delicate features in igneous, metamorphic, or sedimentary rocks. Cavosie et al. (2002) used EPD t ...
... Disintegration (EPD), which uses spark discharges of >100 kV to disaggregate a rock, largely along grain boundaries (Rudashevsky et al. 1995, Saint-Eidukat and Weiblen 1996). This technique can preserve delicate features in igneous, metamorphic, or sedimentary rocks. Cavosie et al. (2002) used EPD t ...
OROGENIC GOLD FORMATION AND TECTONIC EVOLUTION OF
... xenocrysts and also did not form from an evolving magmatic-hydrothermal system, but are instead formed by orogenic fluids. A second hydrothermal event formed the E-W veins at ~152 Ma, isolated in time from any regional magmatism. In addition to the geochronological research on the ore-hosting grano ...
... xenocrysts and also did not form from an evolving magmatic-hydrothermal system, but are instead formed by orogenic fluids. A second hydrothermal event formed the E-W veins at ~152 Ma, isolated in time from any regional magmatism. In addition to the geochronological research on the ore-hosting grano ...
A review of geological origins and relationships in the Ballantrae
... related the lavas and agglomerates to the established Early Devonian volcanic episode of southern Scotland, with the serpentinite as a younger intrusion. This instigated the next round of Ballantrae controversy: arguments over the age of the rocks. The first definitive contribution to the age debate ...
... related the lavas and agglomerates to the established Early Devonian volcanic episode of southern Scotland, with the serpentinite as a younger intrusion. This instigated the next round of Ballantrae controversy: arguments over the age of the rocks. The first definitive contribution to the age debate ...
Mesozoic tectonics of the Maria fold and thrust belt and McCoy basin
... and McCoy Basin tectonic provinces of southeastern California. We also present new geologic mapping, structural analysis from macroscopic to microscopic scale, U-Pb zircon ages and Ar-Ar hornblende and biotite ages from key areas in the Maria Fold and Thrust Belt and McCoy Basin to resolve kinematic ...
... and McCoy Basin tectonic provinces of southeastern California. We also present new geologic mapping, structural analysis from macroscopic to microscopic scale, U-Pb zircon ages and Ar-Ar hornblende and biotite ages from key areas in the Maria Fold and Thrust Belt and McCoy Basin to resolve kinematic ...
Carbonate Facies and Sedimentation of the Klapanunggal
... ness is between 0.1 and 0.50 m. In the packstone layers, the coral fragments are often recognized. Based on the physical properties and abundance of the biota, this facies can be grouped into three subfacies, i.e. foraminifera packstone-, foraminifera-coral packstone-, and foraminifera-algae packsto ...
... ness is between 0.1 and 0.50 m. In the packstone layers, the coral fragments are often recognized. Based on the physical properties and abundance of the biota, this facies can be grouped into three subfacies, i.e. foraminifera packstone-, foraminifera-coral packstone-, and foraminifera-algae packsto ...
Crustal Evolution of the GreatBasin and the Sierra
... of thousands of cubic kilometers of ash-flow deposits, making it one of the greatest manifestations of prolonged ash-flow volcanism in the terrestrial rock record. Some individual calderas are exposed east to west across three or four mountain ranges. Simplecooling-unit outflow tuff sheets cover are ...
... of thousands of cubic kilometers of ash-flow deposits, making it one of the greatest manifestations of prolonged ash-flow volcanism in the terrestrial rock record. Some individual calderas are exposed east to west across three or four mountain ranges. Simplecooling-unit outflow tuff sheets cover are ...
The detrital record of orogenesis: A review of approaches and
... The sediment archive, of material eroded from an active tectonic region and stored in adjacent basins, can provide a valuable record of hinterland tectonism especially when information in the source region itself is obscured by later metamorphism or removed by tectonism or erosion. Using the sedimen ...
... The sediment archive, of material eroded from an active tectonic region and stored in adjacent basins, can provide a valuable record of hinterland tectonism especially when information in the source region itself is obscured by later metamorphism or removed by tectonism or erosion. Using the sedimen ...
Sample pages 2 PDF
... It forms gently undulating plain that receives adequate rainfall and has moderate run-off resulting in good direct rainfall infiltration and formation of extensive and moderately productive or locally developed and highly productive fissured aquifers. According to earliest investigation by USBR (196 ...
... It forms gently undulating plain that receives adequate rainfall and has moderate run-off resulting in good direct rainfall infiltration and formation of extensive and moderately productive or locally developed and highly productive fissured aquifers. According to earliest investigation by USBR (196 ...
Geology of the Kimberley Region, Western Australia: The East
... Australia, a large part of which is composed of Precambrian rocks. The area was mapped by combined teams of Bureau of Mineral Resources and Geological Survey of Western Aus tralia geologists between 1962 and 1967: the results of the first three years' mapping—of the southeastern part of the Kimberi ...
... Australia, a large part of which is composed of Precambrian rocks. The area was mapped by combined teams of Bureau of Mineral Resources and Geological Survey of Western Aus tralia geologists between 1962 and 1967: the results of the first three years' mapping—of the southeastern part of the Kimberi ...
DNR White Pass - Yakima Campbell
... form the hills and the streams still occupy the synclinal valleys. Crossing Burbank Creek. The northeast bridge abutment rests on Frenchman Springs and Vantage rocks. A large fault may exist along the south bank of Burbank Creek, which places Ellensburg sediments against Frenchman Springs, with the ...
... form the hills and the streams still occupy the synclinal valleys. Crossing Burbank Creek. The northeast bridge abutment rests on Frenchman Springs and Vantage rocks. A large fault may exist along the south bank of Burbank Creek, which places Ellensburg sediments against Frenchman Springs, with the ...
Geology of the Death Valley area
The exposed geology of the Death Valley area presents a diverse and complex set of at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related formations geologists call a group. The oldest rocks in the area that now includes Death Valley National Park are extensively metamorphosed by intense heat and pressure and are at least 1700 million years old. These rocks were intruded by a mass of granite 1400 Ma (million years ago) and later uplifted and exposed to nearly 500 million years of erosion.Marine deposition occurred 1200 to 800 Ma, creating thick sequences of conglomerate, mudstone, and carbonate rock topped by stromatolites, and possibly glacial deposits from the hypothesized Snowball Earth event. Rifting thinned huge roughly linear parts of the supercontinent Rodinia enough to allow sea water to invade and divide its landmass into component continents separated by narrow straits. A passive margin developed on the edges of these new seas in the Death Valley region. Carbonate banks formed on this part of the two margins only to be subsided as the continental crust thinned until it broke, giving birth to a new ocean basin. An accretion wedge of clastic sediment then started to accumulate at the base of the submerged precipice, entombing the region's first known fossils of complex life. These sandy mudflats gave way about 550 Ma to a carbonate platform which lasted for the next 300 million years of Paleozoic time.The passive margin switched to active margin in the early-to-mid Mesozoic when the Farallon Plate under the Pacific Ocean started to dive below the North American Plate, creating a subduction zone; volcanoes and uplifting mountains were created as a result. Erosion over many millions of years created a relatively featureless plain. Stretching of the crust under western North America started around 16 Ma and is thought to be caused by upwelling from the subducted spreading-zone of the Farallon Plate. This process continues into the present and is thought to be responsible for creating the Basin and Range province. By 2 to 3 million years ago this province had spread to the Death Valley area, ripping it apart and creating Death Valley, Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the current ice age, with lakes. Lake Manly was the largest of these lakes; it filled Death Valley during each glacial period from 240,000 years ago to 10,000 years ago. By 10,500 years ago these lakes were increasingly cut off from glacial melt from the Sierra Nevada, starving them of water and concentrating salts and minerals. The desert environment seen today developed after these lakes dried up.