modoc plateau geology

Drew earned a PhD. Modoc Plateau, and West Cascades Ecoregional Assessments. 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 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. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. In places contains mollusks or vertebrate fossils indicating Pleistocene age; mostly deposits of late Pleistocene age, but locally includes some deposits of early Holocene age. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. 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. 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. The Oldest Rocks: The Piedmont and Blue Ridge During the Miocene, the Coast Ranges were flooded again, with underwater volcanic eruptions in the southern part of the range and deposition of fossil-rich shales like the Monterey formation. It is lonely country out in the Modoc. 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. 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. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. Platy flow-jointing common. The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. Gold has been recovered along the eastern margin of the Great Valley, where it was derived from the Sierra Nevada. Historically, 20 percent of the four million ounces of gold mined in California originated in the Klamath Mountains. The West Shasta district has a long history of copper and zinc production out of chalcopyrite and sphalerite. Franciscan rocks have a complex geological structure. The Foothill Metamorphic Belt likely came ashore as an island arc terrane, colliding with the edge of North America to the west of the current Melones fault zone. The threat of catastrophic wildfire and competition with barred owls (Strix varia) are concerns for the conservation of the spotted owl, a federally listed species that occurs within the ecoregion. The Western Jurassic Plate stretches for 220 miles on the western edge of the mountains. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. Geothermal systems with evidence of magmatic heat . The oldest rock in this part of the range is the Santa Monica Slate. 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. 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. Roadside Geology of Northern and Central California, "Second Edition", 2016, Alt/Hyndman Roadside Geology of Oregon, "Second Edition", 2016, Marli B. Miller These soils developed in basins from stratified alluvium of ash and lacustrine deposits. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Locally a late Hemingfordian age indicated by mammalian fauna (Woodburn and Robinson, 1977). 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. In the southern part of the range, between the Nacimiento and San Andreas fault zones, the metamorphic rocks and granite plutons of the Salinian block make up the basement rock. Virtually all of the islands in the bay are man-made from dredged sediments. Age, mostly Oligocene; may include some rocks of early Miocene age. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Therefore, the volcano may be even larger than the estimated 600 km3(143 mi3, already the largest volcano by volume in the Cascade Range. Fissure eruptions. The transfer property within the State Park is located on two constituent soil types. The water erosion hazard on these soils is low, while the wind erosion hazard is moderate, due to the high percentage of silt (refer to TableVI-1). Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Flows like water in many cases. Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. CA 36: Red . 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. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. 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. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. Free shipping for many products! Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have had activity within the last 500years (CDMD, 1994). Precipitation also changes significantly from north to south, with annual rainfall below 12 inches per year in portions of the Modoc Plateau in California. [2] Cities and counties must regulate certain development projects within the zones, which includes withholding permits until geologic investigations demonstrate that development sites are not threatened by future surface displacement (Hart, 1997). This property could potentially be subjected to ground motion from displacement along any of these local and regional faults. Forest stand patterns on the landscape often reflect this complex fire history. 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. Learn about conservation and open space in your state. 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. 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. Therefore, aside from naturally occurring erosional processes, no impact is anticipated. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Most of the gold historically mined in California originated in the Mother Lode belt, located in the foothills of the western Sierras. Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . 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. The Ventura Avenue field, north of Ventura is one of the largest fields in California, producing since 1903. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. The subsurface is well known from oil wells and oil fields are bounded in the east by the Kern Front fault. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. Furthermore, each of the properties would be subject to regional volcanic events originating from the previously discussed volcanoes. 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! Geology. 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. Share sensitive information only on official, secure websites. Areas along the northeastern shores of Big Lake are mapped as Recent Modoc basalt flows (CDMG, 1968). [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. The Great Valley Sequence is a 40,000 foot thick formation at the western edge of the Central Valley that formed between the Jurassic and Cretaceous, overlying the Franciscan Assemblage and granite rocks associated with the Sierra Nevada to the east. 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. Listed on Feb 28, 2023 Tertiary pyroclastic and volcanic mudflow deposits. [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. "Modoc County has an area of 3823 square miles. GitHub export from English Wikipedia. in Geology from Syracuse University with a focus on. Groundwater quality in the 39,000-square-kilometer Cascade Range and Modoc Plateau (CAMP) study unit was investigated by the U.S. Geological Survey (USGS) from July through October 2010, as part of the California State Water Resources Control Board (SWRCB) Groundwater Ambient Monitoring and Assessment (GAMA) Program's Priority Basin Project (PBP). US 97: Weed-Oregon 294. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. Consequently, these soils will continue to remain submerged on an annual basis. Cascades & Modoc Plateau Geology - YouTube Skip navigation Sign in 0:00 / 45:45 Cascades & Modoc Plateau Geology Kiersti Ford 541 subscribers Subscribe 6 Dislike Share 195 views Oct 7, 2021. These are Jurassic and Cretaceous age greywacke, chert, basalt, ultrabasic rocks and serpentinite from modified oceanic crust. 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. The plateau is capped with scattered small, young cinder cones and basalt flows. 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. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. Movement along the Sierra Nevada fault helped to create the new Muir Crest and parts of the mountain range rose up to 10,000 feet over the last three million years, creating a steep face to the west of Owens Valley. The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. An exception is the broad Teays Valley which was created by a large, preglacial river. 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). The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. Additionally, borate deposited during arid conditions, with mining after 1926. In addition to gold, platinum is sometimes found with gold placers. 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. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). Links to Completed Ecoregional Assessments. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. The thick Galice formation slate and metamorphosed greywacke overlie the Josephine ophiolite and likely deposited in a deep ocean environment offshore of the island arc. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. 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). 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. Recent (Holocene) volcanic flow rocks; minor pyroclastic deposits; in part Pleistocene. Geology 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. However some areas are virtually devoid of vegetation, due to deficient nutrient supplies (NRCS, 2000). 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). As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. 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). The western pond turtle is listed as an endangered species in Washington, although it has more robust populations in the Oregon and California portions of its range. A few may date earlier, like the 400 million year old Mule Mountain. The Transverse Ranges are poorly drained by streams, but subject to periodic intense flooding, typically every 20 to 25 years. 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. The latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. 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 San Andreas Fault became perhaps most active after the Miocene, potentially resulting in up to 350 miles of offset in some locations.[2][3]. Condado de Modoc, California, Estados Unidos The northeastern-most county in California with a total area of 4,203.37 square miles, but with a population under 10,000. Statutes such as Section 404 of the Clean Water Act and other federal and state regulations require an erosion and sedimentation control plan prior to major construction. Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. 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. California has 435 recognized alliances and within those more than 1,200 vegetation associations exist. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. Gassaway soils occur approximately 30percent of the complex and have formed from eolian deposits in pockets of the broken Lava Flow lands. 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. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. . 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. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. 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. Hill (1915) published a sketch map of the geology of.the High-grade mining district, a small gold district in the north Warner Mountains. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. Therefore, the transfer would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death. Geological Survey of Canada, Open File 5529. Shrub-steppe vegetation composed of big sagebrush (Artemesia tridentata) or antelope bitterbrush (Purshia tridentata) and native bunchgrasses occurs along the foothills and higher south-facing slopes. Most of these wetlands have been drained and converted to agriculture. Site is located on private property in Modoc County, California, approximately 10 kilometers from the Oregon border and 20 kilometers from the Nevada border. This added metavolcanic and metasedimentary rocks to the slowly building Sierras. Even moderate shaking . In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. 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. Mostly nonmarine, but includes marine deposits near the coast. 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). Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. 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. Proposal Type: Mandatory Revision Course is being updated for periodic review. 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. The Clear Lake National Wildlife Refuge and Long Bell State Game Refuge are located on the plateau as well. The McArthur Swamp, Bowman Ditch, and the Ahjumawi Property are located within or adjacent to the McArthur Fault-Rupture Zone. Commonly flow banded; locally glassy. 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. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. 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. There are also several herds of wild horses on the plateau. [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. The San Onofre Breccia also formed during this period with distinct glaucophane schist, gabbro, limestone and greenschist. Partly coeval with the Saddle Mountains Basalt of the Columbia River Basalt Group (Swanson and others, 1979), Thin, commonly open-textured (diktytaxitic), subophitic to intergranular olivine basalt flows, intercalated with and grades laterally through palagonite breccia and tuff into tuffaceous sedimentary rocks (unit Ts). The Modoc Plateau is a volcanic table land approximately 4,000 to 6,000 feet above mean sea level. Sign in with your username (email address) and password. Simultaneously island arcs and small sections of continental crust rafted onto the edge of North America, building out the continent. [20] They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). Wetlands in the ecoregion are home to many birds including bald eagles, geese, ducks, herons, cranes, rails, and various songbirds. Therefore, a less-than-significant impact is expected. [Age is early Tertiary (Eocene).] Pyroclastic Rock. Historically, fires occurred at irregular intervals from under 10 years in the lowland foothills to 150 years or more at high elevations. 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 largest wild population in Washington occurs within the ecoregion in the Columbia River Gorge. From inside the book . 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. Discovering the Colorado Plateau will explore this region through Surface fault rupture is not necessarily restricted to the area within an Alquist-Priolo Zone. 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. The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). Locally includes resurgent domes related to caldera complexes. 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. 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. In the nineteenth century, mining began in the vicinity of Julian, extracting nickel and gold, in the Julian Schist. Mercury was first discovered in Santa Barbara County in 1796. Granite plutons emplaced during the Jurassic and Cretaceous, forming rock units like the Ironside Mountain diorite, which outcrops for 37 miles from the Orleans Mountain lookout tower to the line between Humboldt County and Siskiyou County or the Shasta Bally batholith at Buckhorn Summit west of Redding. 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. With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. 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. Rainbow (Oncorhynchus mykiss) and cutthroat trout are the common cold water inhabitants. This 6"x9" paperback has 371 pages that are packed with detailed information about California Geology. Ground disturbing activities are prohibited on the Ahjumawi Property by the deed restrictions contained within the Conservation Easement, which will coincide with the property. Glass in tuff and tuffaceous sedimentary rocks is commonly altered to zeolites, clay minerals, and small amounts of opal, chalcedony, orthoclase, and calcite. These different regions are called geological provinces. These areas contain a series of broad, relatively flat mid-elevation valleys that once supported a vast expanse of lakes and marshes that drained into the Klamath River. In some places they are interbedded with shale, limestone and radiolarian chert. In fact volcanic rocks are 10,000 feet thick in the western part of the Santa Monica Mountains. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. Whipp soils account for approximately 60 percent of these map units, while Cupvar soils account for approximately 25 percent. Sandstone, shale, and conglomerate; in part Miocene and Eocene. Use the interactive map to zoom smoothly from a national view to state and local perspectives anywhere across the country.

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