modoc plateau geology

Fossils are common in the marine rocks of the Pacific Beach and Mission Bay formation around San Diego. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. Initially, hydraulic mining was used to get at placer deposits, but it destroyed the landscape and choked rivers with sediments, ultimately being banned the California government in 1884. Axelrod (1966) reported a K-Ar age of . 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. 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. The western portions of Burney Falls are underlain by Pliocene nonmarine sedimentary rock, comprised chiefly of diatomite, which was deposited in a lacustrine setting. The basement rocks of the Sierra Nevada date to the Paleozoic and include rocks in the Shoo Fly complex and Grizzly Formation. Consequently, these soils will continue to remain submerged on an annual basis. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. Geothermal systems with evidence of magmatic heat, associated wi Locally porphyritic with phenocrysts of alkali feldspar, plagioclase, and minor augite, ferro-hedenbergite, hornblende, hypersthene, or biotite. Geologists have interpreted the bay as the drowned channel of the Santa Ana River. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. Deep hydrothermal systems active in marine sedimentary rocks as they were being metamorphosed emplaced the gold. 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. Course Description: Application of the principles of geology to interpret rock sequences and evaluate the potential for volcanic activity in the Cascades Range and Modoc Plateau region of Northern California. Geology. . 0 Reviews. It is a succession of valleys, that in the past were inland lakes, and which follow one another through the county from north to south. 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. High Cascades and the Modoc Plateau Road Guides 294. Geologists have struggled to define its structural geology with complex sequences of deep ocean crust, upper mantle rock and tectonic melanges. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). In the 19th century, a railroad pier was built out into the canyon to avoid waves closer in to shore when loading and unloading ships. These flyers, referred to as Geo Gems Notes, address individual parks and describe the geological features they support, explain the geological processes demonstrated by the landforms at the site and their significance, and indicate where to find the sites in each park unit. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. Before the end of the Oligocene, sea levels rose again leaving behind the Vaqueros Formation and then the Miocene deep water silt and clay of the Rincon Formation. Soils located on the Ahjumawi Property consist of the Pastolla muck, 0 to 1 percent slopes, which are similar to those located along the Bowman Ditch, except that it is not artificially drained (NRCS, 2000). Modoc Plateau. Soils of the Cupvar Silty Clay, 0 to 2 percent slopes mapping unit are located in the central portion of the southern half of the site. Requires ability to work and study under rigorous conditions. The strata form characteristic flat-topped hills, and consist of a succession of light-colored clays and white or yellowish-white sandstones. Henhill Silt Loams are classified as neutral to slightly alkaline and have moderate shrink-swell potential. Comments: Columbia Plateau. The Warner Basalt is the most common rock in the plateau, bordered by the Surprise Valley fault zone that first became active in the Miocene 15 million years ago. In places includes talus and slope wash. California has 435 recognized alliances and within those more than 1,200 vegetation associations exist. Ash-flow tuff, lava flows, pumice-lapilli tuff, coarse pumicite, flow breccia, and domal complexes of rhyolitic, rhyodacitic, and dacitic composition; in places includes peralkaline rhyolite and some andesite and andesite breccia. The Transverse Ranges are poorly drained by streams, but subject to periodic intense flooding, typically every 20 to 25 years. These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. In the northern end of the county are notable Goose Lake, Tule Lake, and the three lakes of Surprise Valley. Policy SG-e - When soil tests reveal the presence of expansive soils, engineering design measures designed to eliminate or mitigate their impacts shall be employed. Therefore, the transfer would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. . As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. An official website of the United States government. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. AmeriCorps Forestry Technicians will perform a wide variety of activities to support all stages of project work. Their hazard for water and wind erosion is none to low when bare. Volcanic eruptions in the Miocene between 9.5 and 3.5 million years ago filled old eroded canyons in parts of the Sierras with lava flows. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. The area extends north to the Oregon border and south to include the Skedaddle Mountains and the Honey Lake Basin. These are Jurassic and Cretaceous age greywacke, chert, basalt, ultrabasic rocks and serpentinite from modified oceanic crust. [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. In addition to the web viewer, the GIS data can be downloaded for further use. These soils have formed in dissected lacustrine terraces from alluvium derived from diatomite lacustrine deposits (NRCS, 2000). doi: 10.4095/223767. In the Shoo Fly complex, the Bullpen Lake sequence has bedded cherts and cooled pillow lava that closely resembles rocks found on flat-topped offshore volcanic guyots, suggesting a deep-sea origin for the base of the Sierras sometime before the Devonian. In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. The province covers an area of 337,000 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah . Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. Abstract. The purpose of the Alquist-Priolo Act is to regulate development on or near active fault traces to reduce the hazard of fault rupture and to prohibit the location of most structures for human occupancy across these traces. They are very deep, poorly drained soils with slow permeability and a high shrink-swell potential (see TableVI-1). Both of these provinces have substantial geothermal resource base and resource potential. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. There are no septic tanks or wastewater disposal systems proposed as part of this project, therefore this item is not applicable. In places includes flows of platy olivine andesite or basaltic andesite. Partly coeval with the Saddle Mountains Basalt of the Columbia River Basalt Group (Swanson and others, 1979), Thin, commonly open-textured (diktytaxitic), subophitic to intergranular olivine basalt flows, intercalated with and grades laterally through palagonite breccia and tuff into tuffaceous sedimentary rocks (unit Ts). The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). Therefore, it is located within a zone of crustal weakness that likely provides a preferred pathway formagmasto reach the surface; the regional fault trends are the primary control onventlocations. Serious flooding in 1862 created a three mile wide lake in the Santa Ana River, while serious flooding in 1938 inundated the San Fernando Valley and parts of the Los Angeles coastal plain, damaging 100 bridges and killing 43 people. 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. Isolated volcanic cones occupy steep mountain ridges, but tend to be smaller than those in the Western Cascades with the exception of Mount Adams. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). These deposited as part of a series of small island arcs, "rafted" against the coast of the proto-North American continent Laurentia. 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. Unit is present in all counties. With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. Lava Beds National Monument contains the best examples of these, although numerous locations boast similar features, such as the Ahjumawi Lava Springs. However, a bulge in the bay's sand spit records offshore presence of the Newport submarine canyon. 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. Tertiary volcanic flow rocks; minor pyroclastic deposits. Throughout the Jurassic the Nevadan Orogeny accelerated with large-scale granitic intrusions and erosion into deep marine basins. The Kern River and San Joaquin River both run in valleys "refilled" with lava. These soils are classified as having a moderate shrink-swell potential[1] and are classified as having a Capability Class rating of IV, due to the high hazard of erosion and they are not considered Prime Farmland. Subsequently, sandstone and shale deposited while the region was still underwater. The three interconnected Suisun, San Pablo and San Francisco bays occupy a structural depression dating to the Pliocene which flooded several times due to Pleistocene glaciations. The southern portion of the ecoregion has extensive valleys and flatlands between the forested mountains and foothills, which include large marshes, irrigated meadows and pastures, and arid juniper and sagebrush steppes. Free shipping for many products! Starting on p. 15, this book is divided into seven chapters dealing with the gold-bearing provinces: 1) Sierra Nevada, 2) Klamath Mountains, 3) Basin Ranges, 4) Mojave Desert,S) Transverse and Peninsular Ranges, 6) Modoc Plateau . For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. [16]. We'll be adding other personal features soon. The Poway Formation has rounded metavolcanic pebbles with no known source nearby, suggesting an original source somewhere in Sonora before a major offset to the north by faults. 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. As discussed under the Bowman Ditch subheading, numerous faults are located in the immediate vicinity of the McArthur Swamp. 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. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). and late Miocene in age (see Fiebelkorn and others, 1983), flows of Deer Butte Formation of Kittleman and others (1967), and extensive unnamed flow sequences in the Basin-Range and Owyhee Upland Provinces of southern Lake, Harney, and Malheur Counties that are younger than Steens Basalt, dated at about 15 Ma (Baksi and others, 1967) and the Owyhee Basalt, dated at about 14 Ma (Bottomley and York, 1976; see also Fiebelkorn and others, 1983), and older than 7 or 8 Ma. Pyroclastic Rock. Ground disturbing activities are prohibited on the Ahjumawi Property by the deed restrictions contained within the Conservation Easement, which will coincide with the property. The Bowman Ditch and adjacent area are underlain by Quaternary lacustrine deposits composed of alluvial sediments derived from volcanic materials, water-lain ash deposits, and local diatomaceous detritus (CDMG, 1968). California has some of the most distinctive and unique geology in the United States. During the Miocene, the Coast Ranges were flooded again, with underwater volcanic eruptions in the southern part of the range and deposition of fossil-rich shales like the Monterey formation. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. The area formed as a series of small island arcs, deep-ocean sediments and mafic oceanic crust accreted to the western edge of North America, producing a series of deep basins and high mountain ranges. 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. 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. Modoc Plateau, and West Cascades Ecoregional Assessments. The San Onofre Breccia also formed during this period with distinct glaucophane schist, gabbro, limestone and greenschist. Extensive marine and nonmarine sand deposits, generally near the coast or desert playas. "Modoc County has an area of 3823 square miles. Gold appears in quartz veins that cut through slate, siltstone and shale originating in the Shasta Bally batholith. The Southern unglaciated Allegheny Plateau is a maturely dissected plateau characterized by high hills, sharp ridges and narrow valleys. Soils at the property have been mapped as the Pit Silty Clay, Drained, 0 to 2 percent slopes mapping unit. Learn about conservation and open space in your state. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Petroglyph Point is an imposing cliff marked with the cultural symbols of the Modoc People, who have lived here for thousands of years. In Rome Basin, includes discontinuous layers of poorly consolidated conglomerate characterized by well-rounded, commonly polished pebbles of chert and pebbles and cobbles of quartzite. It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River. An exception is the broad Teays Valley which was created by a large, preglacial river. Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. The Modoc Plateau and surrounding area is a predominantly rural region of northeastern California, southern Oregon, and northwestern Nevada, centered on the Modoc Plateau physiographic province ().In general, the Modoc study area is characterized by elevated heat flow (Williams and DeAngelo, 2011) and some 30 known geothermal systems as identified by thermal springs and wells (Faulds et al . Oil drilling in the Wilmington field cause up to 30 feet of subsidence at the eastern end of Terminal Island between 1937 and 1958. The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. The threat of catastrophic wildfire and competition with barred owls (Strix varia) are concerns for the conservation of the spotted owl, a federally listed species that occurs within the ecoregion. Ships from Sacramento, CA. Basalt flows, plugs and dikes, some olivine basalt, and andesite and latitic rocks. These disturbances could cause increased dust generation, siltation caused by placement of large aggregate on the waterside of levees, local soil compaction caused by equipment loads, and exposure of mineral soil surfaces to erosion. The Whipp-Cupvar Complex, 0 to 2 percent slope soils occupy the central, northern portion of the southern half of the site. In southeast Oregon many domal complexes younger than 11 Ma exhibit a well-defined southeast to northwest age progression (Walker, 1974; MacLeod and others, 1976) from about 11 Ma to less than 1 Ma, Additional scientific data in this geographic area. . The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. Proposal Type: Mandatory Revision Course is being updated for periodic review. The Peninsular Ranges are a group of mountain ranges that extend 900 miles (1,400km) from the Los Angeles basin and Transverse Ranges southward the entire length of Baja California. The river drains a 612-square mile area, but due to the porous volcanic nature of the region, most of the stream flow originates from springs within the valley. Locally includes resurgent domes related to caldera complexes. Fisher, once common in this ecoregion, now occurs only in the extreme southwestern portion of the East Cascades. It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. 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. [3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). These soils formed on stream terraces from alluvium derived from extrusive igneous rocks. The Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. Basalt flows, flow breccia, and basaltic peperite; minor andesite flows; some interbeds of tuff and tuffaceous sedimentary rocks. The oldest rock in this part of the range is the Santa Monica Slate. They have a moderate hazard for water and wind erosion when bare. Five Holocene Faults including the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are all located within 20 miles of the property. The Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). The Modoc Plateau has both active volcanoes and faults. ;] 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. In fact volcanic rocks are 10,000 feet thick in the western part of the Santa Monica Mountains. [2] Cities and counties must regulate certain development projects within the zones, which includes withholding permits until geologic investigations demonstrate that development sites are not threatened by future surface displacement (Hart, 1997). This area is currently inundated due to the lack of maintenance of the levee along the southern boundary of the property. In 1873, 53 Modoc men held off 650 US troops, killing 70 of them in heavy weather in the lava plateau to the south of Tule Lake. Lava Beds National Monument is on the Modoc Plateau in Modoc and Siskiyou Counties. However, each of the proposed uses would not expose people or new structures to potential substantial adverse effects, including the risk of loss, injury, or death. They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). 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. Some Great Valley rocks are exposed in the Coastal Ranges as well, like the Jurassic Knoxville Formation shale. 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. GitHub export from English Wikipedia. Unlike most of California, the Mojave region has numerous Precambrian Proterozoic rocks, such as granitic gneiss or marble intruded with porphyry in the Ord Mountains or schist in the Old Woman Mountains. Therefore, aside from naturally occurring erosional processes, no impact is anticipated. The Modoc Plateau is located in the northeastern corner of the state, framed by and including the Warner Mountains and Surprise Valley along the Nevada border to the east and west to the edge of the southern Cascades Range. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. Click here to use the California geological interactive map Source: California Geological Survey Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. Some counties divided the alluvium into younger and older units, and some did not. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. During the Miocene, a deep marine channel filled with up to 15,000 feet of sediment which is most of the rock exposed on the Channel Islands. There are also several herds of wild horses on the plateau. Listed on Feb 28, 2023 Geologic guide to the Modoc Plateau and the Warner Mountains : annual field trip guidebook of the Geological Society of Sacramento, 1980. [19]. Technicians will serve vegetation management and fuels reduction efforts, supporting initiatives for healthy, productive, and resilient forest landscapes and resources. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. 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. Most of these wetlands have been drained and converted to agriculture. 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. Columbia River / Modoc Plateau basalt. From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. As with the Bowman Ditch, the Ahjumawi Property is located in a seismically active region with numerous, previously referenced faults and volcanoes situated in the immediate vicinity. This act requires the State Geologist to delineate various seismic hazard zones and requires cities, counties, and other local permitting agencies to regulate certain development projects within these zones. The only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. Qya-Younger alluvium: Map unit is used in Churchill, Elko, Esmeralda, Eureka, Humboldt, Lander, and Lincoln Counties where geologic information suggests better-defined younger versus older alluvium. The 7.6 magnitude 1952 Kern County earthquake was one of the most powerful in California in the 20th century. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. The exception to this is where the natural drainage regime is altered, as is the case for areas immediately adjacent to the channeled ditch. On this Wikipedia the language links are at the top of the page across from the article title. The ecoregion includes a large pumice zone in central Oregon, dominated by lodgepole pine (Pinus contorta), one of the very few places where the species is the climax tree (not replaced by other conifers if fire is suppressed). These rocks are rich in plagioclase, quartz and chlorite mica (which gives them a greenish color) and range up to 25,000 feet thick. Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. ADVERTISEMENT Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. California Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. The vast tableland between the Cascades and the Warners is referred to as the Modoc Plateau. Share sensitive information only on official, secure websites. These mapped faults include the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults; whereby the McArthur fault trends northwesterly through the site between Big Lake and Horr Pond (CDMG, 1994). [4] and Modoc Cypress (Cupressus bakeri).[5]. The Alquist-Priolo Earthquake Fault Zoning Act (formerly the Alquist-Priolo Special Studies Zone Act), signed into law December 1972, requires the delineation of zones along active faults in California. Therefore, a less-than-significant impact is expected. 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. Numerous lakes, reservoirs and marshes characterize the East Cascades, providing exceptional habitat for waterfowl, shorebirds and wading birds, aquatic mammals, amphibians, fish, aquatic plants and invertebrates. The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse Range. 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). The services DOC provides are designed to balance today's needs with tomorrow's obligations by fostering the wise use and conservation of energy, land and mineral resources.

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