modoc plateau geology

Most of these wetlands have been drained and converted to agriculture. Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. 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. 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 . They have a moderate to high hazard of erosion by water and a low to moderate erosion hazard from wind in exposed, bare areas (refer to TableVI-1). [J Curtis Kramer; Geological Society of Sacramento. Includes deltaic gravel and sand and gravel bars, in pluvial lake basins in southeastern part of map area. An abundance of species are supported by high elevation meadows, parklands and forests: low-elevation dry forests, oak woodlands, cliffs and talus slopes, riparian corridors, and a variety of aquatic habitats. Tertiary pyroclastic and volcanic mudflow deposits. 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. 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. 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). Secure .gov websites use HTTPS Wetlands in the ecoregion are home to many birds including bald eagles, geese, ducks, herons, cranes, rails, and various songbirds. 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. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. Geologists have struggled to define its structural geology with complex sequences of deep ocean crust, upper mantle rock and tectonic melanges. Extensive marine and nonmarine sand deposits, generally near the coast or desert playas. 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. Also includes minor rhyolite and dacite flows and domes. These sulfide minerals derive from the Copley Greenstone and or sea floor vents when the region was far offshore and formed as hot water "invaded" the Balaklala rhyolite. Following the exchange, Burney Falls and Bowman Ditch will be protected from major construction and other soil disturbing activities by the legal restrictions applicable to State parklands. Miners extracted placer gold or dug up fossil placers in the Weaverville Formation and Hornbrook Formation. 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 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. The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. 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 Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. 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. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). . The West Shasta district has a long history of copper and zinc production out of chalcopyrite and sphalerite. It is also known for scores oflava-tubecaves and for well-preserved young volcanic features. The plateau is capped with scattered small, young cinder cones and basalt flows. 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. . In places includes flows of platy olivine andesite or basaltic andesite. [10], At the edge of the Los Angeles coastal plain and just west of the San Joaquin Hills, Newport Bay is a major hub of boating. This property could potentially be subjected to ground motion from displacement along any of these local and regional faults. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. 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 . [9]. Dugan and Graven soils are comprised of soils formed on mounds and stream terraces from alluvium of extrusive igneous rocks. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). Tertiary volcanic flow rocks; minor pyroclastic deposits. 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. Holocene faults such as the, McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are located within a 20-mile radius of the site. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. 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 eastern portion of the property is underlain by Plio-Pleistocene olivine basalt flows such as those exposed by the falls on Burney Creek (CDMG, 1994). The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. The exception to this is where the natural drainage regime is altered, as is the case for areas immediately adjacent to the channeled ditch. The province covers an area of 337,000 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah . Sur Series schist, quartzite, marble, gneiss and granulite in the Salinian block likely deposited in a marine shelf late in the Paleozoic. Agency The Great Basin Institute Location Susanville, CA Job Category Temporary/Seasonal Positions Salary ~ $1,680 Bi weekly Start Date 05/22/2023 Last Date to Apply The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. 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. The McArthur Swamp and the Glenburn Dredge Site are located within the same regional geographical area and geomorphic province as the McArthur-Burney Falls Memorial Park. These rocks are rich in plagioclase, quartz and chlorite mica (which gives them a greenish color) and range up to 25,000 feet thick. Most of the Modoc National Forest is covered by basaltic lava flows. Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. 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. Mostly nonmarine, but includes marine deposits near the coast. Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. Hill*s work, however, is of little value in understanding the areal . They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. 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). 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. Geologists debate how high the early Sierra Nevada were. SP026: Traveling America's loneliest road: A geologic and natural history tour through This project could not have been undertaken without the financial support of The Nature Conservancy's Oregon, Washington and California offices, and the Washington Department of Fish and Wildlife (WDFW). 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. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. Map unit used in all counties for recent lake beds, playas, and flood plains. The transfer property within the State Park is located on two constituent soil types. The soils are moderately to strongly alkaline. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. [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). They are shallow, moderately well drained soils with slow permeability and have a high shrink-swell potential (see TableVI-1). They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. By contrast, the Trinity ophiolite is found in the east, known for its numerous ultramafic rocks and being one of the most extensive ophiolites in the US. [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. Nearly 1,000,000 acres (400,000 ha) of the Modoc National Forest are on the plateau between the Medicine Lake Highlands in the west and the Warner Mountains in the east. Most of the gold deposits date to the Cretaceous and formed in narrow belt around the Melones fault in quartz veins. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. The Modoc Plateau is a volcanic table land approximately 4,000 to 6,000 feet above mean sea level. Large mammals are emblematic of the ecoregion, which supports populations of elk, blacktail deer, mule deer, bighorn sheep, mountain lions, and black bears. 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. 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! [17]. 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. By contrast, the Eastern Klamath Plate is made up of limestone, chert and pyroclastic rocks, divided in half by the Trinity ophiolite. It is mostly interchangeable with Qal, except that it implies some specifically younger Quaternary deposits. 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. Geology 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. 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. Medicine Lake volcano lies in a strongly east-west extensionaltectonicenvironment slightly east of the main Cascade Range arc axis on the Modoc Plateau in northern California. There are also several herds of wild horses on the plateau. The Santa Ynez Mountains extend up the coast of Santa Barbara County and contain Franciscan basement rocks (also referred to as the Franciscan basement complex) like the Coast Ranges. For much of the Cenozoic the region was filled with lakes and brackish swamps. Rockhounding. In some places, ophiolite sequences preserve remnant oceanic crust rock on land, while other parts of the range are intruded with ultrabasic igneous rocks that have serpentinized to peridotite. The east side of the Warner Mountains in particular has exposed rock in the many canyons, including finds of petrified wood and assorted gemstones. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. These soils have a Capability Class rating of III to IV and are considered Prime Farmland when irrigated (NRCS, 2000). The Modoc Plateau is part of the larger Columbia Plateau which extends into eastern Oregon and Washington, southern Idaho, northern Nevada and western Wyoming. Seismic hazards addressed by this element include surface faulting, ground shaking, and ground failure. The small Conejo field to the east of Camarillo was geologically unusual in that the reservoir rock is fractured volcanic rock from the Miocene. The Whipp-Cupvar Complex, 0 to 2 percent slope soils occupy the central, northern portion of the southern half of the site. Both of these provinces have substantial geothermal resource base and resource potential. Pyroclastic Rock. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. In the Triassic, the Paleozoic rocks of the Calaveras complex were heaved under the Shoo Fly complex by the Sonoma orogeny, which is preserved in roof pendants and country rock inclusions. 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. Drillhole data indicate that the plateau surface underlying the volcano has been downwarped by 0.5 kilometer under its center. Fountains. These rocks date to the Cretaceous, with a lower sequence of conglomerate overlain by sandstone and shale, with huge ammonite fossils. Site is located on private property in Modoc County, California, approximately 10 kilometers from the Oregon border and 20 kilometers from the Nevada border. In the early Cenozoic, widespread erosion of crystalline rocks inland produced huge quantities of sediment which deposited on the Cretaceous rocks of the Peninsular Ranges. Active subduction began in the Triassic during the Mesozoic, producing large granite intrusions and the beginning of the Nevadan Orogeny as well as more dryland conditions and the retreat of the ocean to the west. The Modoc exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). Volcanic rocks erupted around Barstow in the Triassic. The Oldest Rocks: The Piedmont and Blue Ridge Fossils are common in the marine rocks of the Pacific Beach and Mission Bay formation around San Diego. The tribes manage tribally-owned lands on reservations and are also involved in monitoring and research activities on ceded lands. Official websites use .gov California was the first place in the US to develop offshore oil drilling in the Summerland field, first found in 1896. These soils formed in basins from fine-textured alluvium from extrusive and basic igneous rock. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. 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. Based on faulting in recent alluvial material, the Surprise Valley fault zone is still active. Proposal Type: Mandatory Revision Course is being updated for periodic review. Gold has been recovered along the eastern margin of the Great Valley, where it was derived from the Sierra Nevada. As indicated by Special Publication 42, Fault-Rupture Zones in California, each of the transfer properties are located in areas with delineated fault-rupture zones. The Klamath Mountains have several areas of preserved oceanic crust. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have had activity within the last 500years (CDMD, 1994).

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