[3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). These rocks date to the Cretaceous, with a lower sequence of conglomerate overlain by sandstone and shale, with huge ammonite fossils. Therefore, the transfer would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death. Reference: Chorlton, L.B. See table of contents below. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. 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 oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. Modoc Plateau, and West Cascades Ecoregional Assessments. [20] 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. Soils of the Cupvar Silty Clay, 0 to 2 percent slopes mapping unit are located in the central portion of the southern half of the site. 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. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. 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. Substantially folding at the edge of the valley creates famous oil producing dome structures like Lost Hills and Kettleman Hills. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. 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. 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. Furthermore, each of the properties would be subject to regional volcanic events originating from the previously discussed volcanoes. 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. These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. Thick Miocene sediments formed in narrow seaways from the Pacific. 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. [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. Basalt flows, plugs and dikes, some olivine basalt, and andesite and latitic rocks. Roadside Geology of Northern and Central California Three remaining mapping units are located in a band along the southern portion of the property and include the Dugan-Graven Complex, Flooded, 0 to 5 percent slopes, Dugan-Graven Complex, 0 to 5percent slopes, and the Pittville Sandy Loam, 0 to 5 percent slopes occupy this area. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. 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). Tertiary pyroclastic and volcanic mudflow deposits. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. 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 soils are not considered Prime Farmland and have a Capability Class rating of IV (NRCS, 2000). 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. Modoc Plateau. "Occasioned lakes, marshes, and sluggishly flowing streams meander across the plateau. Pyroclastic Rock. Hot springs including San Jacinto, Eden, Saboba and Gilman are active in the San Jacinto Mountains due to the presence of the San Jacinto fault zone and Elsinore was founded on its hot springs. 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. The Transverse Ranges are poorly drained by streams, but subject to periodic intense flooding, typically every 20 to 25 years. Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. The Peninsular Ranges are a group of mountain ranges that extend 900 miles (1,400km) from the Los Angeles basin and Transverse Ranges southward the entire length of Baja California. Each of the proposed transfer properties are located within a seismically active region and could experience significant groundshaking and/or earthquake induced landslides resulting from displacement along one of the following Holocene Faults including the, McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults. Geology | South Carolina Encyclopedia They have a moderate hazard for water and wind erosion when bare. [13]. Extensive marine and nonmarine sand deposits, generally near the coast or desert playas. Groundwater-Quality Data in the Cascade Range and Modoc Plateau - USGS The Modoc Plateau has both active volcanoes and faults. Eruptions relatively quiet, but spectacular. Levee improvements and associated road maintenance necessary for delivery of imported fill would also cause temporary disturbances to the topsoil surfaces. 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 Reference Books item is sold by MyHometownVintage. Very large earthquakes that occur closer to the Northern California coast could cause damaging levels of ground shaking here too. 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. . 5.2 Cascades and Modoc Plateau Province - California In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. Lava Beds National Monument contains the best examples of these, although numerous locations boast similar features, such as the Ahjumawi Lava Springs. Learn about conservation and open space in your state. 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. With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). wikipedia.en/Outline_of_California.md at main - github.com In places includes flows of platy olivine andesite or basaltic andesite. The River | Fall River Conservancy In places includes talus and slope wash. By contrast, the Eastern Klamath Plate is made up of limestone, chert and pyroclastic rocks, divided in half by the Trinity ophiolite. Locally porphyritic with phenocrysts of alkali feldspar, plagioclase, and minor augite, ferro-hedenbergite, hornblende, hypersthene, or biotite. PDF Modesto Junior College Course Outline of Record Report 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. These soils also occupy smaller areas along Fall River in the southern half of the property. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). Roadside Geology of Northern and Central California - eBay 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. 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. The Oldest Rocks: The Piedmont and Blue Ridge Modoc National Forest - Rocks & Minerals:Rockhounding . These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. Rockhounding. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. The East Cascades in Washington and northern Oregon resulted from tectonic uplift and subsequent erosion by alpine glaciers and landslides. For much of the Cenozoic the region was filled with lakes and brackish swamps. In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Unit is present in all counties. On the McArthur Swamp property, grading activities involved with the construction and development of wetland habitat at the Hollenbeak and Ash fields would have the potential to cause accelerated erosion, unless proper erosion control measures are implemented. Rhyolitic to dacitic varicolored bedded tuff, lapilli tuff, and fine- to medium-grained tuffaceous sedimentary rocks with interstratified welded and nonwelded ash-flow tuff and interbedded basalt and andesite flows. 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.
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