modoc plateau geology

Petroglyph Point is an imposing cliff marked with the cultural symbols of the Modoc People, who have lived here for thousands of years. Basalt flows, plugs and dikes, some olivine basalt, and andesite and latitic rocks. Even moderate shaking . Policy SG-f - Shasta County shall pursue preparation of development standards based on topography and soil erosion potential in revising its land capability standards pursuant to Policy CO-h. Policy SG-g - Shasta County should comply with the requirements of the Seismic Hazards Mapping Act, when the Seismic Hazards Maps for the County are completed and made available by the State Geologist. In the nineteenth century, mining began in the vicinity of Julian, extracting nickel and gold, in the Julian Schist. [18]. Glacial till and moraines. Examples include the Silverado Formation with 1400 feet of Paleocene terrestrial sedimentary rock in the Santa Anas or the Eocene Poway Formation near San Diego. The bay system was the second place in the US to be mapped in 1826 by Edward Belcher and Alex Collie, a surveyor and surgeon respectively on the British vessel HMS Blossom. Roadside Geology of Northern & Central California by David D. Alt and Donald W. Hyndman Only $25.99 Learn about the Geology of California with maps, photos and expert descriptions! Includes Pike Creek Formation of Walker and Repenning (1965), originally identified as Pike Creek Volcanic Series by Fuller (1931), and unnamed volcanic and volcaniclastic rocks of southern Lake County, some of which have been correlated with the Miocene and Oligocene Cedarville Formation of northeastern California, Lava flows, breccia, volcaniclastic and epiclastic rocks mostly of andesitic and dacitic composition; includes minor amounts of altered basaltic rocks. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). The geologic information, particularly for the Klamath Mountains, Modoc Plateau, and northern Sierra Nevada, has been updated to reflect the more recent geologic understanding of these complex areas. [8], The Modoc Plateau is an undulating expanse of Miocene to Holocene basalt law flows at the southwest edge of the Columbia Plateau, covering 10,000 square miles. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. Oil was first extracted in 1850 from the Pico Canyon field, close to Newhall with larger-scale production by 1875. Geothermal systems with evidence of magmatic heat, associated wi To determine the nature of the differences between northern and southern Arizona, geologists could: map the geology in detail, take seismic profiles, study drill core, and reconstruct the geologic history between each province. Precipitation also changes significantly from north to south, with annual rainfall below 12 inches per year in portions of the Modoc Plateau in California. GitHub export from English Wikipedia. There is a dramatic moisture gradient across the ecoregion as the precipitation diminishes from the cold, wet Cascade crest (up to 120 inches of precipitation per year) to the warm, dry eastern border with the Columbia Plateau and Great Basin (less than 20 inches per year). Some soils are found in each property while others are more or less restricted to one portion of the property. Before a development permit is granted for a site within a seismic hazard zone, a geotechnical investigation of the site has to be conducted and appropriate mitigation measures incorporated into the project design. Their distribution and numbers are significantly reduced, particularly due to dams that restrict their passage through much of the ecoregion. Potassium-argon ages on rocks in unit from southeast Oregon range from about 13 to 16 Ma; lenses of interbedded tuffaceous sedimentary rocks locally contain a Miocene (Barstovian) vertebrate fauna, Plugs and domal complexes of rhyolitic, rhyodacitic, and dacitic composition; includes related near-vent flows, flow breccia, and deposits of obsidian, perlite, and pumice. Golden eagles (Aquila chrysaetos) inhabit a small portion of their historical ranges and are limited in distribution while the peregrine falcon (Falco peregrinus) is making a comeback. On the McArthur Swamp property, grading activities involved with the construction and development of wetland habitat at the Hollenbeak and Ash fields would have the potential to cause accelerated erosion, unless proper erosion control measures are implemented. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. Each of the proposed transfer properties are located within a seismically active region and could experience significant groundshaking and/or earthquake induced landslides resulting from displacement along one of the following Holocene Faults including the, McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults. An official website of the United States government. As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. Roadside Geology of Northern and Central California - David D. Alt 2016 Sierra Nevada -- Klamath mountains -- Coast range -- The great valley -- High Cascades on the Modoc plateau -- Basin and range. Share sensitive information only on official, secure websites. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. The West Shasta district has a long history of copper and zinc production out of chalcopyrite and sphalerite. [7], The Klamath Mountains formed as small island arc terranes accreted against the coast of North America before and during the Devonian and overlain by newer rocks, deposited from the Cretaceous to modern times. Pahoehoe vs. aa lavas. Get this from a library! Whipp soils account for approximately 60 percent of these map units, while Cupvar soils account for approximately 25 percent. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. Creating your LandScope profile is fast, free, and simple. MOD - Modoc Plateau, CA, USA. Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. Basaltandbasaltic andesitedominate the lower flanks, but higher on the volcano,basalticlavas are mostly absent,andesitedominates, and high-silicalavas are present. At least 300 lava tubes are known in Lava Beds National Monument, some of which preserve ice year round. In addition to gold, platinum is sometimes found with gold placers. Recent (Holocene) volcanic flow rocks; minor pyroclastic deposits; in part Pleistocene. In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. The proposed project involves no earthwork at the Burney Falls, Bowman Ditch, and Ahjumawi Properties. Dominant land uses are forestry, livestock grazing, recreation and conservation. The Shasta County General Plan provides the following policies for properties outside of the FERCs jurisdiction as they relate to seismic and geologic hazards: Policy SG-c - Shasta County shall coordinate with state and federal agencies monitoring volcanic activity and shall periodically review and update the Shasta County Emergency Plan with respect to volcanic hazards. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. Lava Beds National Monument contains the best examples of these, although numerous locations boast similar features, such as the Ahjumawi Lava Springs. The Modoc Plateau is part of the larger Columbia Plateau which extends into eastern Oregon and Washington, southern Idaho, northern Nevada and western Wyoming. Geologists debate how high the early Sierra Nevada were. They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. Nearly 1,000,000 acres (400,000ha) of the Modoc National Forest are on the plateau between the Medicine Lake Highlands in the west and the Warner Mountains in the east. During the Jurassic, many sediments shed into the region from the rising proto-Sierra Nevada. Seismic hazards addressed by this element include surface faulting, ground shaking, and ground failure. Adherence to appropriate engineering, design, and construction practices, such as dust control, seasonal considerations, and rapid revegetation, would minimize impacts involving these improvements at the McArthur Swamp property, resulting in a less than significant impact. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. Up to 10,000 feet of sandstone and red shale deposited during the Eocene, after which sea levels dropped in the Oligocene preserved the sand, gravel and silt of the Sespe Formation. The southern portion of the McArthur Swamp property is comprised of numerous soil mapping units, which include the Cupvar, Whipp, Pittville, Dugan, and Graven soil series. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. This ecoregion has one of the most extensive Ponderosa pine forests in the western U.S., occurring in all parts of the ecoregion, from Wenatchee to Mount Lassen. As deep basins up to one mile deep formed in the Miocene and filled with thick sediments, volcanic eruptions related to the San Andreas Fault led to rhyolite and basalt eruptions. Isolated volcanic cones occupy steep mountain ridges, but tend to be smaller than those in the Western Cascades with the exception of Mount Adams. The province covers an area of 337,000 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah . The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River. 27 Permit, which requires agreement with the USFWS and a water certification or waiver. The basement rocks of the Sierra Nevada date to the Paleozoic and include rocks in the Shoo Fly complex and Grizzly Formation. In Washington, much of the ecoregion is within the ceded lands and usual and accustomed fishing areas of tribes. These soils formed on stream terraces from alluvium derived from extrusive igneous rocks. Oregon white oak (Quercus garryana) woodlands occupy lower elevations near the Columbia River in the central portion of the ecoregion and also the western parts of the Modoc and Upper Klamath Basin sections in the south. Hill*s work, however, is of little value in understanding the areal . Older alluvium, lake, playa, and terrace deposits. The Lava Flows-Gassaway Complex, 2 to 15 percent slopes map unit is found along the northeastern shoreline of Big Lake at the northeastern edge of the site. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. At mid elevations, there are areas of Douglas-fir and grand fir (Abies grandis) forests to the north, and white fir and Douglas-fir forests to the south. ADVERTISEMENT The plateau is capped with scattered small, young cinder cones and basalt flows. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). California Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. True. In all, 20 oil fields are located in the Santa Barbara Channel, with one of the largestthe Dos Cuadras fieldfound in 1968, although a major spill on January 18, 1969, hampered interest in the field. [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). In Washington and the rapidly developing areas around Bend in Oregon, timber companies have recently begun to sell their lands in the mid-elevation forest and transition zones to developers. Additionally, the recontouring of the Hollenbeck field and excavation of three ponds in the S-field would be considered a major construction/ excavation activity and would disturb over 10,000square feet of surface area. The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. The Burney Falls properties are located to the northwest of the Rocky Ledge Fault-Rupture Zone. Most of the Modoc National Forest is covered by basaltic lava flows. As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915. These rocks date to the Cretaceous, with a lower sequence of conglomerate overlain by sandstone and shale, with huge ammonite fossils. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. One potassium-argon age of about 28 Ma on porphyritic hornblende andesite from Sheep Creek, southwest corner of Union County, indicates in part coeval with unit Tsf. Additionally, each of the properties lie within or adjacent to an Alquist-Priolo Fault-Rupture Study Zone. Should one of the local faults in the area experience displacement, the McArthur Swamp could potentially experience levee failures from ground lurching and/or lateral spreading. Locally includes soils containing abundant organic material, and thin peat beds. Unique geology in the region formed bastnaesite mined at the Mountain Pass rare earth mine. Modoc Plateau. . Lake beds interbedded with volcanic ash are typical of the Cenozoic. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. The transfer property within the State Park is located on two constituent soil types. Second edition. The Modoc Plateau is characterized as a transitional region between the Basin and Range Geomorphic Province to the east and the Cascade Range Geomorphic province to the west and north. The Coast Range is at even higher risk for damaging landslides than other parts of coastal California due to sheared serpentinite in Franciscan basement rocks. Throughout the Jurassic the Nevadan Orogeny accelerated with large-scale granitic intrusions and erosion into deep marine basins. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. Lava lakes. These habitats are a critical part of the Pacific flyway, supporting vast numbers of shorebirds and waterfowl, the densest wintering concentration of bald eagles in the world, and many other wildlife species. There are no septic tanks or wastewater disposal systems proposed as part of this project, therefore this item is not applicable. Tertiary pyroclastic and volcanic mudflow deposits. Includes rhyolite at Owyhee Dam, Jump Creek Rhyolite, and Littlefield Rhyolite, all of Kittleman and others (1965); Dooley Rhyolite Breccia of Gilluly (1937), radiometrically dated at 14.7 0.4 Ma by potassium-argon methods (Fiebelkorn and others, 1983); resurgent domal masses in McDermitt caldera area; and extensive unnamed flows and ash-flow tuffs in the central and southern part of the Owyhee Upland. Britton Silt Loams, 30 to 50 percent slopes soils are characterized as being relatively shallow (10 to 20inches), and well drained with moderately slow permeability. The Typical rock formations in the area include volcanic breccia, mud and ash flows, lava flows, lacustrine (lake) deposits, and cinder cone pyroclastic rocks. Links to Completed Ecoregional Assessments. The largest wild population in Washington occurs within the ecoregion in the Columbia River Gorge. The bulk of the plateau is composed of ancient lava flows and volcanic tuff dating back between 10 and 2 million years ago during the Tertiary period. All of these rocks were uplifted in the Pleistocene at the same time as the Coast Range orogeny, formed an anticlinal arch or tilted block against the Santa Ynez fault in the north. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. [12] Ships from Sacramento, CA. Use the interactive map to zoom smoothly from a national view to state and local perspectives anywhere across the country. Borehole Conditions The vault is a horizontal tunnel, located beneath 5 meters of overburden to maintain thermal stability. Find many great new & used options and get the best deals for Roadside Geology of Northern and Central California (paperback) at the best online prices at eBay! Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. With the exception of some metasedimentary and metavolcanic rocks, most rocks in the Peninsular Ranges are igneous and Jurassic in age, dating to the time of the Nevadan orogeny. Sign In Skip to Main Content They are bounded on the north by the Modoc Fault, which runs from Lake Murray to Georgia. Much more recent Pliocene terrestrial sedimentary rocks are also common in the northern Peninsular Ranges like the San Timoteo Canyon and Mount Eden conglomerate, sandstone and siltstone which are up to 7000 feet thick. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. The Modoc Plateau has a diverse geography, with portions draining into closed basins such as Goose Lake and Surprise Valley, and most of the remainder draining into the Pitt River, a tributary of the Sacramento River. In places includes talus and slope wash. The low shield shape, central caldera, and dominance ofmaficlavas are similar to Newberry Volcano of central Oregon, also located in anextensionaltectonicenvironment east of the Cascade arc axis. Further, DPR is bound by its General Plan with respect to Burney Falls and must conduct a CEQA review for any activities which deviate from the approved plan. Volcanism continued through the Holocene, forming the 300 foot thick basalts of the Cima Volcanic Field or the Barstow-Amboy axis of volcanic craters, which have protected underlying granite from erosion. The latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. Discovering the Colorado Plateau - Bill Haggerty 2021-04-01 The Colorado Plateau is America's western treasure, home to the country's highest concentration of national parks, monuments, wilderness areas, and state parks, and a near-endless bounty of wild, stunning landscape. Thick Pliocene marine rocks up to 14,000 feet thick are found on the edges of the Santa Clara River Valley and parts of the San Fernando Valley, stretching to Fillmore. Roadside Geology of Northern and Central California, "Second Edition", 2016, Alt/Hyndman Roadside Geology of Oregon, "Second Edition", 2016, Marli B. Miller The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. North of the San Joaquin River, the mountains have a tilted-block pattern caused the Sierra Nevada fault, which is interpreted as being similar to the more common Basin and Range terrain to the east. In the late 20th century, enough gold was found in association with the mercury, arsenic, tungsten and thallium to open the McLaughlin mine in the Mayacmas Mountains around Knoxville. Fisher, once common in this ecoregion, now occurs only in the extreme southwestern portion of the East Cascades. Locally includes resurgent domes related to caldera complexes. As a registered user, you can customize maps, save them, and share them with your friends. In places contains mollusks or vertebrate fossils indicating Pleistocene age; mostly deposits of late Pleistocene age, but locally includes some deposits of early Holocene age. During the Pleistocene, the mountains had a large number of glaciers and cirques and glacially-carved U-shaped valleys are remaining features from that time period. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. Geology Finally, the Modoc Plateau, a volcanic table ranging from 4,000 to 6,000 feet (1,200 to 1,800 m) in elevation, separates the Medicine Lake Highlands in the west from the Warner Mountains in the east, covering roughly 1,000,000 acres (400,000 ha) of the forest. The thick Galice formation slate and metamorphosed greywacke overlie the Josephine ophiolite and likely deposited in a deep ocean environment offshore of the island arc. This unit corresponds with unit Tb on the 1978 State map. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas.

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