modoc plateau geology

modoc plateau geology

Also includes isolated masses of dacitic and rhyodacitic flows, breccia, and ash-flow tuff along eastern slope of Cascade Range that are lapped by flows and sediments of the Madras (or Deschutes) Formation. A lock () or https:// means youve safely connected to the .gov website. These different regions are called geological provinces. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. Therefore, the Shasta County Building division would not be required to issue a development permit. The McArthur fault is mapped as trending in a northwesterly direction about three miles northeast of the site between Big Lake and Horr Pond (CDMG, 1994). 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. The Ahjumawi Property is located immediately adjacent to the southeast of the Bowman Ditch and therefore the subsurface is comprised of similar alluvial sediments and water-lain ash deposits. In places includes talus and slope wash. Seismic hazards addressed by this element include surface faulting, ground shaking, and ground failure. [11]. 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. Some Great Valley rocks are exposed in the Coastal Ranges as well, like the Jurassic Knoxville Formation shale. In 1815, the Los Angeles River, which then drained to Long Beach, flooded so substantially that it changed course, joining Ballona Creek and flowing to Santa Monica Bay, before another flood in 1825 redirected it back to Long Beach. The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. 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 only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. Fossil plants and vertebrates indicate an Oligocene and Miocene age. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. They have a high shrink-swell potential and have a low water erosion hazard and low wind erosion hazard when bare (see TableVI-1). US 97: Weed-Oregon 294. This produced major crustal stretching, volcanism and displacement of up to 125 miles. A .gov website belongs to an official government organization in the United States. Andesite and dacite typically have plagioclase, hornblende, and clinopyroxene phenocrysts; some flows aphyric. 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. On this Wikipedia the language links are at the top of the page across from the article title. In places includes interlayers of silicic volcaniclastic rocks and tuffaceous sedimentary rocks. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). According to available geologic maps from the California Division of Mines and Geology (CDMG), the Modoc Plateau is underlain by Tertiary sediments and recent volcanic rocks that have been block-faulted into north trending ranges, which have resulted in large open valleys. Around Shasta Reservoir are other copper and zinc deposits in the Triassic-age Bully Hill rhyolite. They are bounded on the north by the Modoc Fault, which runs from Lake Murray to Georgia. A thick sequence of mostly terrestrial sedimentary rocks including the Rosario, Ladd, Trabuco and Williams formations is exposed on the western slope of the Santa Ana Mountains and Santa Ana Canyon, stretching southward to Camp Pendleton, San Onofre, and smaller exposures in Encinitas, Leucadia, Point Loma and La Jolla. in Geology from Syracuse University with a focus on. 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. . In places includes flows of platy olivine andesite or basaltic andesite. 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. The Golden State includes both the highest and lowest point in the continental US and practically every conceivable geological feature known. The plateau consists of a thick accumulation of lava flows and tuff beds along with many small volcanic cones. Additionally, the banks of the levees could experience localized landslides and slumps. Most of the ares sits at an elevation of between 4,000 and 6,000 feet. Includes Shumuray Ranch Basalt and Antelope Flat Basalt of Kittleman and others (1965), Grassy Mountain Basalt of Corcoran and others (1962), Drinkwater Basalt of Bowen and others (1963), basalt formerly assigned to Danforth Formation by Piper and others (1939) (see Walker, 1979), Hayes Butte Basalt of Hampton (1964), Pliocene and upper Miocene basalt flows capping and interstratified with the Madras (or Deschutes) Formation, and basalt flows interstratified in the Dalles Formation of Newcomb (1966; 1969). Substantially folding at the edge of the valley creates famous oil producing dome structures like Lost Hills and Kettleman Hills. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. Grizzly bears and gray wolves no longer occur in the ecoregion, however lynx and wolverines may occasionally visit the northernmost portions. What people are saying - Write a review. Additionally, when polygons have been edited and changed to alluvium, Qal was used as the general value; hence it now is present in all counties. Characteristics of basaltic magma. A thrust fault, known as the Trinity or Bully Choop thrust, separates the Eastern Klamath Plate from the Central Metamorphic Plate. Gassaway soils occur approximately 30percent of the complex and have formed from eolian deposits in pockets of the broken Lava Flow lands. The geology of California is highly complex, with numerous mountain ranges, substantial faulting and tectonic activity, rich natural resources and a history of both ancient and comparatively recent intense geological activity. 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. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. Rhyolitic to dacitic varicolored bedded tuff, lapilli tuff, and fine- to medium-grained tuffaceous sedimentary rocks with interstratified welded and nonwelded ash-flow tuff and interbedded basalt and andesite flows. California Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. The region surrounding the Modoc Plateau, encompassing parts of northeastern California, southern Oregon, and northwestern Nevada, lies at an intersection between two tectonic provinces; the Basin and Range province and the Cascade volcanic arc. In fact, the East Cascades support an unusually high aquatic biodiversity among ecoregions in the U.S., including a large number of endemic freshwater snails and fish. 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. Lake beds interbedded with volcanic ash are typical of the Cenozoic. Reviews aren't verified, but Google checks for and removes fake content when it's identified. Official websites use .gov Two small islands to the north: North Island and South Island have been connected with fill to create the Naval Air Station. 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. The tribes manage tribally-owned lands on reservations and are also involved in monitoring and research activities on ceded lands. Simultaneously island arcs and small sections of continental crust rafted onto the edge of North America, building out the continent. The oldest rock in this part of the range is the Santa Monica Slate. Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. These soils have formed in dissected lacustrine terraces from alluvium derived from diatomite lacustrine deposits (NRCS, 2000). In spite of low rainfall, the numerous lava tubes and volcanic fractures in the plateau produce the Fall River Springs, one of the largest springs in the US. Flows like water in many cases. The volcano is positioned at a kink where northwest-trending faults entering the volcano from the south turn to the northeast, and then back to northwest. 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. The combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. Abstract. Geology - 156 pages. Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. Hill*s work, however, is of little value in understanding the areal . Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. Get this from a library! They have a moderate hazard for water and wind erosion when bare. Examples of filled basins included the Los Angeles Basin, the Eel River Basin around Eureka or the 50,000 foot thick sedimentary sequences of the Ventura Basin. Modoc National Forest 800 West 12th Street Alturas, CA 96101 (530) 233-5811 Warner Mountain Ranger District PO Box 220 Cedarville, CA 96104 (530) 279-6116 Camping Warren Peak and Patterson Lake The nearest campground is available at Pepperdine Camp, near the trailhead. [21], Geology and geological history of California, San Francisco Bay, San Pablo Bay and Suisun Bay, Mercury and gold mining in the Coast Ranges, "Intro to Geology of the San Joaquin Valley", https://en.wikipedia.org/w/index.php?title=Geology_and_geological_history_of_California&oldid=1080684754, This page was last edited on 2 April 2022, at 19:37. California's Geomorphic Regions Modoc Plateau Location: located east of Cascade Range and adjacent to the Basin & Range Region The Modoc Plateau is the California part of the greater Colombian Volcanic Plateau that extends into Oregon, Washington & Canada Mountains California's Geomorphic Regions: About 85 percent of mercury produced in the US throughout its history was mined in the Coast Ranges, with about $200 million worth extracted between 1850 and 1980. Geological Survey of Canada, Open File 5529. Map unit used in all counties for recent lake beds, playas, and flood plains. The Upper Klamath Basin and the Modoc Plateau are large land forms that characterize the southern portion of the ecoregion. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. The largest wild population in Washington occurs within the ecoregion in the Columbia River Gorge. [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. Halemaumau, Mauna Loa Geology. What is this giant ro. Additionally, borate deposited during arid conditions, with mining after 1926. 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. Since the active McArthur fault traverses the site, any displacement along this segment of the fault could result in potential fault rupture at the surface. 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. This region of the mountains was likely underthrusted by the adjoining plates, producing multiple schists around 380 to 400 million years ago in the Ordovician. Activities planned for the McArthur Swamp after the ownership transfer would not differ substantially from historic activities undertaken in the area since site reclamation earlier in the century. Includes older alluvium and related deposits of Piper (1942), Willamette Silt (Allison, 1953; Wells and Peck, 1961), alluvial silt, sand, and gravel that form terrace deposits of Wells and others (1983), and Gresham and Estacada Formations of Trimble (1963). Age, mostly Oligocene; may include some rocks of early Miocene age. Joint surfaces and cavities commonly lined with hematite or montmorillonite clay, secondary silica minerals, zeolites, celadonite, or calcite. 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). Virtually all of the islands in the bay are man-made from dredged sediments. Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. Kokanee (Oncorhynchus nerka) can be found in lakes in the northern and central portions of this ecoregion in Washington. Lavaflows reach elevations as low as 1,024 m (3,360 ft) although most lavas are found above 1,249 m (4,100 ft), the approximate elevation of the surrounding Modoc Plateau. With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. In some areas, decades of fire suppression have resulted in large areas of dense, fire-prone forest. Additionally, the Burney Falls area could be affected by regional volcanic events originating within the Mt. The oldest rocks are found in the San Jacinto and Santa Rosa mountains, with schist and gneiss that may be up to 22,000 feet thick. It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. In the Modoc Plateau, Douglas-fir becomes less important, western white pine (Pinus monticola) woodlands dominate many areas, and Jeffrey pine (Pinus jeffreyi) and Washo pine (Pinus washoensis) occur with or replace ponderosa pine. 896, p. 1018-1019). [J Curtis Kramer; Geological Society of Sacramento. [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. The eastern ranges, including the Santa Rosa Mountains are typically over 6,000 feet (1,800m) high, with San Jacinto Peak reaching 10,805 feet, whereas the western ranges like the Santa Ana, Agua Tibia and Laguna mountains are lower. 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. Includes Picture Rock Basalt of Hampton (1964), radiometrically dated by potassium-argon methods as middle(?) The federally-listed Lost River sucker (Deltistes luxatus), and shortnose sucker (Chasmistes brevirostris), bull trout, and salmon stocks drive many of the conservation activities in the ecoregion. Modoc Plateau: Average elevation 1370 m (4500 feet) Predominant rocks: Late Cenozoic volcanics, especially basalts in the Modoc Plateau, andesites and dacites in the Cascades Plate tectonic setting: Andean-style volcanic arc in the Cascades, Basin and Range volcanoes in the Modoc Plateau Most recent eruptions: Lassen, 1914-1921 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. We haven't found any reviews in . Some rocks in the Western Jurassic Plate seem to have been subducted, reaching blueschist grade metamorphism in the sequence of metamorphic facies in the South Fork Mountain schist. The mountains are drained by the Santa Margarita, San Luis Rey, San Diego and San Dieguito rivers, while San Felipe Creek in the east drains into the Salton Sea. These soils are moderately deep, moderately well drained and have slow permeability. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. These two locations are located approximately 30 miles east of the Park and less than a mile south of the Bowman Ditch and Ahjumawi Property. Hot springs including San Jacinto, Eden, Saboba and Gilman are active in the San Jacinto Mountains due to the presence of the San Jacinto fault zone and Elsinore was founded on its hot springs. the structural geology and tectonics of mid-ocean ridges and Icelandin 2011. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). A machinist leased the property and used windmills to get small remaining amounts of oil out. Chromite weathers out of peridotite in the Josephine ophiolite in Del Norte County and some beach placers close to Crescent City have up to seven percent chromite. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. 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. Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. Hill (1915) published a sketch map of the geology of.the High-grade mining district, a small gold district in the north Warner Mountains. They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). Learn about conservation and open space in your state. 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. From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. [17]. Click here to use the California geological interactive map Source: California Geological Survey 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. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. Below the bays, is the Merced Formation, with 45000 feet of marine rocks overlain by 500 feet of terrestrial sedimentary rocks and capped with more modern sediments from the Sacramento River. Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. 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. Project work may include post fire recovery efforts. The Modoc Plateau Region (Figure MOD-1) encompasses 22,858 km of the volcanic tablelands east of the Cascade and northern Sierra Nevada ranges in Modoc, Lassen, and Siskiyou counties. It is also known for scores oflava-tubecaves and for well-preserved young volcanic features. These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. All Rights Reserved. The proposed project involves no earthwork at the Burney Falls, Bowman Ditch, and Ahjumawi Properties. AmeriCorps Forestry Technicians will perform a wide variety of activities to support all stages of project work. They have a low shrink-swell potential, low to moderate water erosion hazard, and a low wind erosion hazard in bare areas (see TableVI-1). 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. As shown, may include some rocks older than Oligocene, correlative with upper parts of unit Tea. Quaternary pyroclastic and volcanic mudflow deposits. [Age is early Tertiary (Eocene).] [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. The movement of the San Andreas Fault and Garlock Fault helped to induce arid conditions during the Cenozoic. Lithology: Flood basalt(s); mafic volcanic rocks; basalt. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. 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. As described under item (a), while various areas of the project site do consist of unstable soils, there are no facilities proposed as part of the project which have the potential to be impacted by these soils, therefore this is a less than significant impact. Includes Touchet Beds of Flint (1938), deposits of valley terraces of Newcomb (1965), and, in southeast Oregon, basin-filling deposits that incorporate Mazama ash deposits (Qma, Qmp) in the youngest layers, Sand, gravel, and silt forming flood plains and filling channels of present streams. These are Jurassic and Cretaceous age greywacke, chert, basalt, ultrabasic rocks and serpentinite from modified oceanic crust. This added metavolcanic and metasedimentary rocks to the slowly building Sierras. They are shallow, moderately well drained soils with slow permeability and have a high shrink-swell potential (see TableVI-1). High Cascades and the Modoc Plateau Road Guides 294. 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. The Josephine ophiolite forms the basement of the western Klamath Mountains, with extensive peridotite from the boundary between the oceanic crust and the mantle, as well as chromite and nickel deposits. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. It formed as a sandspit filled in to the north from sediment deposited by the Tijuana River and sheltered from wind and waves by the Cretaceous uplands of Point Loma. Franciscan rocks have a complex geological structure. The California Geological Survey's interactive geological map allows users to identify the different rock types and fault lines throughout California. In the northern end of the county are notable Goose Lake, Tule Lake, and the three lakes of Surprise Valley. "Modoc County has an area of 3823 square miles. Technicians will serve vegetation management and fuels reduction efforts, supporting initiatives for healthy, productive, and resilient forest landscapes and resources. Most of the gold historically mined in California originated in the Mother Lode belt, located in the foothills of the western Sierras. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. 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. Reference: Chorlton, L.B. Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. Very hot and fluid, but low in volatile content. 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. Unit is present in all counties. The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. Compared with the Sierra Nevada, rocks from this time period tend be more calcic than silicic. There are also several herds of wild horses on the plateau. Commonly flow banded; locally glassy. Whipp soils account for approximately 60 percent of these map units, while Cupvar soils account for approximately 25 percent. The east side of the Warner Mountains in particular has exposed rock in the many canyons, including finds of petrified wood and assorted gemstones. 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. Polygons from the 1978 State map unit Qp were added where no playa was shown on the county maps. 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 Seismic Hazards Mapping Act was developed to protect the public from the effects of strong groundshaking, liquefaction, landslides, or other ground failure, and from other hazards caused by earthquakes. Per square mile of drainage, the Eel River has the highest suspended sediment load of any river in the US, exceeding the Colorado River and Mississippi River. In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. [15] Modoc Plateau, and West Cascades Ecoregional Assessments. ADVERTISEMENT 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. Glass in tuff and tuffaceous sedimentary rocks is commonly altered to zeolites, clay minerals, and small amounts of opal, chalcedony, orthoclase, and calcite. 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. 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. Sign in with your username (email address) and password. Construction workers needed to build dikes to protect a power plant and jack up bridges. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. [14]. 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.

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