modoc plateau geology

Fissure eruptions. 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. Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. 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. Geologists debate how high the early Sierra Nevada were. 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. Reviews aren't verified, but Google checks for and removes fake content when it's identified. 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). Flows like water in many cases. The Western Jurassic Plate stretches for 220 miles on the western edge of the mountains. The Shasta County General Plan contains a Public Safety Element as required by Section 65302(g) of the California Government Code, which requires that General Plans include an element containing identification and appraisal of seismic and geologic hazards. Should one of the local faults in the area experience displacement, the McArthur Swamp could potentially experience levee failures from ground lurching and/or lateral spreading. In places includes flows of platy olivine andesite or basaltic andesite. Extensive marine and nonmarine sand deposits, generally near the coast or desert playas. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. 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 soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). 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. They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). 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. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. Free shipping for many products! It is the only state with all three types of plate boundaries, an extraordinary history of earthquakes and volcanoes, and it has many rocks and minerals found nowhere else. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. 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. 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. These soils have a Capability Class rating of III to IV and are considered Prime Farmland when irrigated (NRCS, 2000). The Golden State includes both the highest and lowest point in the continental US and practically every conceivable geological feature known. The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. In addition, the Bowman Ditch and surrounding area are located within an area that could be affected by regional volcanic events originating within the Mt. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). 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. 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! With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. Mostly nonmarine, but includes marine deposits near the coast. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. 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. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. Both of these provinces have substantial geothermal resource base and resource potential. 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. All Rights Reserved. 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. in Geology from Syracuse University with a focus on. The actual distribution of these ten mapping units is complex, and therefore, will be described by bisecting the site into two northern quadrants and a southern half. Most precipitation accumulates from November through April. 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. 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. The exception to this is where the natural drainage regime is altered, as is the case for areas immediately adjacent to the channeled ditch. Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. Seismic hazards addressed by this element include surface faulting, ground shaking, and ground failure. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. [18]. [17]. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. Furthermore, the McArthur Fault bisects the property and is designated as an Alquist-Priolo Fault-Rupture Study Zone. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. This is considered a less-than-significant impact. 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. What is this giant ro. 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. Around Shasta Reservoir are other copper and zinc deposits in the Triassic-age Bully Hill rhyolite. . Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. 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). Fountains. Many of the ash--flow tuffs exhibit flow features and only obscure vitro-clastic textures. 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. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). [15] Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. However some areas are virtually devoid of vegetation, due to deficient nutrient supplies (NRCS, 2000). ;] Even moderate shaking . 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. 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. 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 soils are not considered Prime Farmland and have a Capability Class rating of IV (NRCS, 2000). [16]. Dugan and Graven soils are comprised of soils formed on mounds and stream terraces from alluvium of extrusive igneous rocks. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. 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. 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. A small andesitic dome near Marysville is the only example of volcanic rocks in the valley exposed near the surface. What people are saying - Write a review. [12] 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. Additionally, borate deposited during arid conditions, with mining after 1926. Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary. 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. Site is located on private property in Modoc County, California, approximately 10 kilometers from the Oregon border and 20 kilometers from the Nevada border. 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: [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). [J Curtis Kramer; Geological Society of Sacramento. As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. 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 small Conejo field to the east of Camarillo was geologically unusual in that the reservoir rock is fractured volcanic rock from the Miocene. An exception is the broad Teays Valley which was created by a large, preglacial river. 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). 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. Very hot and fluid, but low in volatile content. As deep basins up to one mile deep formed in the Miocene and filled with thick sediments, volcanic eruptions related to the San Andreas Fault led to rhyolite and basalt eruptions. Gassaway soils have a Capability Class rating of VIII and are not considered Prime Farmland. Axelrod (1966) reported a K-Ar age of . This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. In the nineteenth century, mining began in the vicinity of Julian, extracting nickel and gold, in the Julian Schist. Medicine Lake volcano is located at the intersection of major tectonic features including the northwestern extension of the Walker Lane fault zone. Geologic guide to the Modoc Plateau and the Warner Mountains : annual field trip guidebook of the Geological Society of Sacramento, 1980. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). 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. Deccan Traps in India. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. The Western Paleozoic and Triassic Plate is the most common unit of the Klamath Mountains and is up to 50 miles wide at the Oregon state line. Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. 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. These soils formed in basins of mixed alluvium and are moderately deep, poorly drained soils with slow permeability and a high shrink-swell potential (see TableVI-1). [13]. The basement rocks of the Sierra Nevada date to the Paleozoic and include rocks in the Shoo Fly complex and Grizzly Formation. The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. Links to Completed Ecoregional Assessments. The oldest rock in this part of the range is the Santa Monica Slate. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. This Reference Books item is sold by MyHometownVintage. Lava Beds National Monument contains the best examples of these, although numerous locations boast similar features, such as the Ahjumawi Lava Springs. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. False. The soils have a Capability Class rating of IV and are not considered Prime Farmland. Volcanism continued through the Holocene, forming the 300 foot thick basalts of the Cima Volcanic Field or the Barstow-Amboy axis of volcanic craters, which have protected underlying granite from erosion. This mapping unit is typically found at the base of toe slopes where alluvium from basalt has been deposited. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. Typical rock formations in the area include volcanic breccia, mud and ash flows, lava flows, lacustrine (lake) deposits, and cinder cone pyroclastic rocks. 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 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. In places includes talus and slope wash. Discovering the Colorado Plateau - Bill Haggerty 2021-04-01 The Colorado Plateau is America's western treasure, home to the country's highest concentration of national parks, monuments, wilderness areas, and state parks, and a near-endless bounty of wild, stunning landscape. Lava Beds National Monument is on the Modoc Plateau in Modoc and Siskiyou Counties. The movement of the San Andreas Fault and Garlock Fault helped to induce arid conditions during the Cenozoic. The Burney Falls properties are located to the northwest of the Rocky Ledge Fault-Rupture Zone. 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. 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. Find many great new & used options and get the best deals for Roadside Geology of Northern and Central California (paperback) at the best online prices at eBay! Locally a late Hemingfordian age indicated by mammalian fauna (Woodburn and Robinson, 1977). Commonly flow banded; locally glassy. Proposal Type: Mandatory Revision Course is being updated for periodic review. Some counties divided the alluvium into younger and older units, and some did not. 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. 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 . Subsequently, sandstone and shale deposited while the region was still underwater. They have a low erosion hazard from water when bare and a moderate hazard from wind erosion. Glacial till and moraines. In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. Fisher, once common in this ecoregion, now occurs only in the extreme southwestern portion of the East Cascades. Very large earthquakes that occur closer to the Northern California coast could cause damaging levels of ground shaking here too. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains. 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. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. These activities include periodic maintenance of levees and roadways, recreational use, and grazing. 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. Large boulders have often eroded out of moraine deposits, coming to rest a few miles away. 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 . The Upper Klamath Basin and the Modoc Plateau are large land forms that characterize the southern portion of the ecoregion. Rhyolite volcanic ash buried other streams during the Oligocene forming tuff that early miners need to dig through to get at placer gold, and many old buildings in the region are made of blocks of tuff. A machinist leased the property and used windmills to get small remaining amounts of oil out. In addition to gold, platinum is sometimes found with gold placers. 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. 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. 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. The Oldest Rocks: The Piedmont and Blue Ridge Quaternary pyroclastic and volcanic mudflow deposits. Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. 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 formed on stream terraces from alluvium derived from extrusive igneous rocks. 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. 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). Source: US geologic names lexicon (USGS Bull. 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. Therefore, a less-than-significant impact is expected. The Modoc Plateau is a mile-high expansive prehistoric lava flow, with areas of sparse vegetation, rough broken lava rock, juniper trees, and sagebrush flats in a semi-arid region covering about a half-million acres. 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. Surface fault rupture is not necessarily restricted to the area within an Alquist-Priolo Zone. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. The combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. Geothermal systems with evidence of magmatic heat, associated wi 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 We haven't found any reviews in . It is composed of layers of volcanic flows and periodic volcanic uplifts. In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. The West Shasta district has a long history of copper and zinc production out of chalcopyrite and sphalerite. Most of the Modoc National Forest is covered by basaltic lava flows. [9]. This 6"x9" paperback has 371 pages that are packed with detailed information about California Geology. Roadside Geology of Northern and Central California, "Second Edition", 2016, Alt/Hyndman Roadside Geology of Oregon, "Second Edition", 2016, Marli B. Miller [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. . 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. Both of these provinces have substantial geothermal resource base and resource potential. This added metavolcanic and metasedimentary rocks to the slowly building Sierras. Some soils are found in each property while others are more or less restricted to one portion of the property. It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River.

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