modoc plateau geology

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. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. 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. We haven't found any reviews in . These rocks were likely moved to their current location by the two major faults. 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 "[1], It is a thick accumulation of lava flows and tuff beds, along with many small volcanic cones. False. 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. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. Drew earned a PhD. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. Surface fault rupture is not necessarily restricted to the area within an Alquist-Priolo Zone. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. [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 added metavolcanic and metasedimentary rocks to the slowly building Sierras. 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). It's a Other size geocache, with difficulty of 1.5, terrain of 1.5. . Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. They are very deep, poorly drained soils with slow permeability and a high shrink-swell potential (see TableVI-1). Soils at the property have been mapped as the Pit Silty Clay, Drained, 0 to 2 percent slopes mapping unit. Pahoehoe vs. aa lavas. In fact volcanic rocks are 10,000 feet thick in the western part of the Santa Monica Mountains. The western gray squirrel is at-risk within the ecoregion in Washington as it is restricted to two isolated populations, but populations in Oregon and California are more robust. Sign In Skip to Main Content Very hot and fluid, but low in volatile content. [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. California was the first place in the US to develop offshore oil drilling in the Summerland field, first found in 1896. Holocene faults such as the, McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are located within a 20-mile radius of the site. 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). Consequently, these soils will continue to remain submerged on an annual basis. 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. Geologic Guide to the Modoc Plateau and the Warner Mountains: Annual Field Trip Guidebook of the Geological Society of . Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). Ground disturbing activities are prohibited on the Ahjumawi Property by the deed restrictions contained within the Conservation Easement, which will coincide with the property. 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. 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. Mountain goats inhabit high elevations in the central and northern part of the ecoregion in Washington, but are largely absent from the southern portion of their range, and absent from Oregon. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. 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. Lake beds interbedded with volcanic ash are typical of the Cenozoic. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. [14]. This is considered a less-than-significant impact. Second edition. ADVERTISEMENT The rocks likely formed much further away from the Sierras and were relocated by the dramatic movements of faults. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. The soils are moderately to strongly alkaline. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. 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. Also includes minor rhyolite and dacite flows and domes. 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. 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 . 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. 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). Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. Plateau in the northeast corner of California, United States, List of plants on the Modoc National Forest, California Geologic Provinces, Note 36, page 2, https://en.wikipedia.org/w/index.php?title=Modoc_Plateau&oldid=1106243134, California placenames of Native American origin, Wikipedia articles needing clarification from May 2016, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 23 August 2022, at 20:13. The Franciscan subduction complex makes up the basement rock for part of the range, with a mlange dominated by graywacke first deposited in offshore deep ocean basins. Creating your LandScope profile is fast, free, and simple. Mercury was first discovered in Santa Barbara County in 1796. 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. 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. Basalt flows, flow breccia, and basaltic peperite; minor andesite flows; some interbeds of tuff and tuffaceous sedimentary rocks. Upper Klamath Lake is Oregons largest lake and is the biggest remnant of this wetland system. Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. The California Geological Survey's interactive geological map allows users to identify the different rock types and fault lines throughout California. Lithology: Flood basalt(s); mafic volcanic rocks; basalt. 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. 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. 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 Pastolla Muck, drained, 0 to 2 percent slopes and Pastolla muck, 0 to 1 percent slopes occupy a large portion of the area of the northern quadrants along the Tule River. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. 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. Twenty-five thousand feet of Jurassic marine sediments in the Sacramento Valley do not necessarily correspond exactly to the height of the mountains, but fist-sized cobbles in conglomerates from the Cretaceous suggest steep conditions and potentially higher altitudes than today. 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. However, a bulge in the bay's sand spit records offshore presence of the Newport submarine canyon. Geologists have interpreted the bay as the drowned channel of the Santa Ana River. 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. It is lonely country out in the Modoc. The soils have a Capability Class rating of IV and are not considered Prime Farmland. in Geology from Syracuse University with a focus on. [1], During the Cenozoic, the volcanic and deep water sedimentary Franciscan rocks were accreted to the edge of California and vast areas of marine sedimentary rocks deposited in the Central Valley and what would become the Transverse and Coast Ranges. According to the Soil Survey for the Intermountain Area of California, ten soil mapping units have been delineated within the vicinity of the McArthur Swamp Property (see TableVI-1). The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. Shelf and slope deposits would ultimately become Great Valley rocks, while the trench deposits became the Franciscan subduction complex. The 7.6 magnitude 1952 Kern County earthquake was one of the most powerful in California in the 20th century. They are small in area and are thought to represent a higher-grade metamorphic environment than the slate belt, and may have formed through subduction, when one plate slid beneath another. 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. Dominant land uses are forestry, livestock grazing, recreation and conservation. 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. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. 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. 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. Two small islands to the north: North Island and South Island have been connected with fill to create the Naval Air Station. In Washington, much of the ecoregion is within the ceded lands and usual and accustomed fishing areas of tribes. Franciscan rocks have a complex geological structure. Modoc Plateau. 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. [17]. As discussed under the Bowman Ditch subheading, numerous faults are located in the immediate vicinity of the McArthur Swamp. . They have a high shrink-swell potential and have a low water erosion hazard and low wind erosion hazard when bare (see TableVI-1). The latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. The plateau is capped with scattered small, young cinder cones and basalt flows. Typical rock formations in the area include volcanic breccia, mud and ash flows, lava flows, lacustrine (lake) deposits, and cinder cone pyroclastic rocks. In addition to gold, platinum is sometimes found with gold placers. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. 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. Petroglyph Point is an imposing cliff marked with the cultural symbols of the Modoc People, who have lived here for thousands of years. [3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). 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. Historically, 20 percent of the four million ounces of gold mined in California originated in the Klamath Mountains. The transfer property within the State Park is located on two constituent soil types. The California Coast Ranges extend from the Oregon line southward 600 miles to the Santa Ynez River. 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. 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. MODOC PLATEAU The Modoc Plateau is a volcanic table land (elevation 4,000- 6,000 feet above sea level) consisting of a thick accumulation of lava ows and tu beds along with many small volcanic cones. The Fall River Valley and McArthur-Burney Fall Memorial State Park are located at the southern end of the Cascade Range within the Modoc Plateau Geomorphic province. One of the most important events was the advent of the San Andreas Fault around 29 million years ago in the Oligocene, when the region subducted a spreading center in the East Pacific Rise. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. They have a Capability Class rating of II and are considered Prime Farmland when irrigated (NRCS, 2000). Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. 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. Sur Series schist, quartzite, marble, gneiss and granulite in the Salinian block likely deposited in a marine shelf late in the Paleozoic. The Whipp-Cupvar Complex, 0 to 2 percent slope soils occupy the central, northern portion of the southern half of the site. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. 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. For much of the Cenozoic the region was filled with lakes and brackish swamps. 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). 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). Unit is present in all counties. Reference: Chorlton, L.B. The Upper Klamath Basin and the Modoc Plateau are large land forms that characterize the southern portion of the ecoregion. 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. 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). Fountains. As indicated in the Project Description, no substantial construction or physical modifications to structures located at the McArthur-Burney Falls Memorial State Park, Bowman Ditch, and Ahjumawi property are proposed in connection with the transfer of ownership. Most erosion of the Sierra Nevada was finished by the Eocene and faulting may have reactivated the roots of the mountains to create the current mountain range. Many of these schists, like the Condrey Mountain schist are more resistant to erosion than other rocks close by. Official websites use .gov 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. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. 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. 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. Study with Quizlet and memorize flashcards containing terms like 11, Cascade Range, Great Valley, Transverse Range, Peninsular Range, Colorado Desert, Coast Ranges, Sierra Nevadas, Mojave Desert, Modoc Plateau, Klamath Mountains, Basin and Range, Mount Whitney, Sierra Nevadas and more. Levee improvements and associated road maintenance necessary for delivery of imported fill would also cause temporary disturbances to the topsoil surfaces. 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.

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