modoc plateau geologymodoc plateau geology
Dominant land uses are forestry, livestock grazing, recreation and conservation. 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. Project work may include post fire recovery efforts. These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. Pahoehoe vs. aa lavas. The Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. 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. The soils are moderately to strongly alkaline. These activities include periodic maintenance of levees and roadways, recreational use, and grazing. ;] As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. Glacial till and moraines. Characteristics of basaltic magma. Geologists group the plutons of the Peninsular Ranges as the Southern California batholith, which includes several large individual plutons like the San Marcos Gabbro, Woodson Mountain Granodiorite or Bonsall Tonalite. Very hot and fluid, but low in volatile content. The area extends north to the Oregon border and south to include the Skedaddle Mountains and the Honey Lake Basin. [12] Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. 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. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. 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. Also includes minor rhyolite and dacite flows and domes. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. Geology. 8 Geomorphic Regions |authorSTREAM Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. The basement rocks of the Sierra Nevada date to the Paleozoic and include rocks in the Shoo Fly complex and Grizzly Formation. In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. Water erosion hazard for bare soil is low to moderate, while the wind erosion hazard is low (refer to TableVI-1). Modoc National Forest - Special Places - US Forest Service The Ventura Avenue field, north of Ventura is one of the largest fields in California, producing since 1903. PDF DREW SILER - geologica.net They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. What is this giant ro. VI. Geology and Soils - California Interactive map of the geology of California | American Geosciences Geology | South Carolina Encyclopedia 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. Locally includes soils containing abundant organic material, and thin peat beds. Unlike most of California, the Mojave region has numerous Precambrian Proterozoic rocks, such as granitic gneiss or marble intruded with porphyry in the Ord Mountains or schist in the Old Woman Mountains. Thick sequences of marine rocks from the Late Cretaceous through the Paleocene and Eocene are common in the mountains and on San Miguel Island. Fast flowing rivers meant that the region has accumulated very little alluvium, except for a rare 400 foot thick deposit in Scott Valley, southwest of Yreka, California. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. Shield volcanos. These soils have a Capability Class rating of III to IV, due to erosion hazards and are not considered to be Prime Farmland (NRCS, 2000). This unit corresponds with unit Tb on the 1978 State map. The color geologic road maps, based on the 2010 Geologic Map of California, are detailed and easy to read. Geology of Northern California Bulletin 190 CA Div of Mines - Etsy Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. This property could potentially be subjected to ground motion from displacement along any of these local and regional faults. It is also known for scores of lava-tube caves and for well-preserved young volcanic features. Gassaway soils occur approximately 30percent of the complex and have formed from eolian deposits in pockets of the broken Lava Flow lands. 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. California's Amazing Geology - Donald R. Prothero - 9781498707954 They have a low hazard from water and wind erosion when exposed. Oil was first extracted in 1850 from the Pico Canyon field, close to Newhall with larger-scale production by 1875. Many of these schists, like the Condrey Mountain schist are more resistant to erosion than other rocks close by. Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. 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. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. This area is currently inundated due to the lack of maintenance of the levee along the southern boundary of the property. Cascades & Modoc Plateau Geology - YouTube 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. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. These soils are classified as having a moderate shrink-swell potential[1] and are classified as having a Capability Class rating of IV, due to the high hazard of erosion and they are not considered Prime Farmland. Around Shasta Reservoir are other copper and zinc deposits in the Triassic-age Bully Hill rhyolite. NGMDB Product Description Page 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). 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. Sur Series schist, quartzite, marble, gneiss and granulite in the Salinian block likely deposited in a marine shelf late in the Paleozoic. Activities planned for the McArthur Swamp after the ownership transfer would not differ substantially from historic activities undertaken in the area since site reclamation earlier in the century. Based on the presence of flat-topped guyot undersea volcanoes with geology similar to the bedded cherts and pillow lavas of the Lava Beds National Monument is on the Modoc Plateau in Modoc and Siskiyou Counties. Wetlands in the ecoregion are home to many birds including bald eagles, geese, ducks, herons, cranes, rails, and various songbirds. 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. 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 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. Roadside Geology of Northern and Central California Modoc National Forest - Special Places - US Forest Service Modoc National Forest - PeakVisor With the close-proximity of numerous faults, these sites within the Park could potentially be subjected to ground motion from displacement along any of these local and regional faults. Subsequently, sandstone and shale deposited while the region was still underwater. 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 Burney Falls properties are located to the northwest of the Rocky Ledge Fault-Rupture Zone. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. 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. 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. 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. Learn about conservation and open space in your state. A few may date earlier, like the 400 million year old Mule Mountain. Some counties divided the alluvium into younger and older units, and some did not. The McArthur Swamp, Bowman Ditch, and the Ahjumawi Property are located within or adjacent to the McArthur Fault-Rupture Zone. Geothermal systems with evidence of magmatic heat, associated wi [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). Hill*s work, however, is of little value in understanding the areal . Most areas are vegetated by such plants as western juniper, ponderosa pine, antelope bitterbrush, manzanita, and Modoc cypress. 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. The San Onofre Breccia also formed during this period with distinct glaucophane schist, gabbro, limestone and greenschist. Forestry Technician (Lassen NF) | Natural Resources Job Board The Colorado Plateau Map And Guide To Public Lands On The Colorado [9]. PDF Geology Of The Sierra Nevada California Natural History Guides / Dev 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. We'll be adding other personal features soon. These deposited as part of a series of small island arcs, "rafted" against the coast of the proto-North American continent Laurentia. 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). 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. Requires ability to work and study under rigorous conditions. In fact volcanic rocks are 10,000 feet thick in the western part of the Santa Monica Mountains. They have a low erosion hazard from water when bare and a moderate hazard from wind erosion. 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. Identify Priority Places: A Practitioner's Guide, Cumberlands and Southern Ridge and Valley, Willamette Valley-Puget Trough-Georgia Basin. Simultaneously island arcs and small sections of continental crust rafted onto the edge of North America, building out the continent. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. Modoc Plateau, and West Cascades Ecoregional Assessments. The tribes manage tribally-owned lands on reservations and are also involved in monitoring and research activities on ceded lands. It is lonely country out in the Modoc. 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. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. See Answer. Source: US geologic names lexicon (USGS Bull. Roadside Geology of Northern and Central California (paperback) During the Jurassic, many sediments shed into the region from the rising proto-Sierra Nevada. [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. 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. [16]. [PDF] A geologic and hydrologic reconnaissance of Lava Beds National Play-fairway analysis for geothermal resources and exploration risk in All of these rocks were uplifted in the Pleistocene at the same time as the Coast Range orogeny, formed an anticlinal arch or tilted block against the Santa Ynez fault in the north. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). Without continuous dredging, San Diego Bay would fill with sediment and become dry land with deposition from the San Diego, Sweetwater and Otay rivers. Second edition. Major geologic changes began in the Cenozoic with continued continental shelf deposition of shale, sandstone and clay as well as near-shore tropical coal deposits. 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. As a result, the applicant will be required to obtain a grading permit from the Shasta County Environmental Health Department consistent with the Shasta County Grading Ordinance. 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. [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. 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. 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. These soils are moderately deep, moderately well drained and have slow permeability. In places includes flows of platy olivine andesite or basaltic andesite. The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). 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. Appendix MP. The Modoc Plateau Region - UC Santa Barbara 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. Includes Picture Rock Basalt of Hampton (1964), radiometrically dated by potassium-argon methods as middle(?) Lithology: Flood basalt(s); mafic volcanic rocks; basalt. 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. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). Abstract. Miners extracted placer gold or dug up fossil placers in the Weaverville Formation and Hornbrook Formation. Ground disturbing activities are prohibited on the Ahjumawi Property by the deed restrictions contained within the Conservation Easement, which will coincide with the property. MOD - Modoc Plateau, CA, USA - University of California, Berkeley Compared with the Sierra Nevada, rocks from this time period tend be more calcic than silicic. CEA - California Earthquake Risk Map & Faults By - Earthquake Authority Grizzly bears and gray wolves no longer occur in the ecoregion, however lynx and wolverines may occasionally visit the northernmost portions. The Maps will include liquefaction hazard zones and earthquake-induced landslide hazard zones. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. 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. . This produced major crustal stretching, volcanism and displacement of up to 125 miles. [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. Numerous lakes, reservoirs and marshes characterize the East Cascades, providing exceptional habitat for waterfowl, shorebirds and wading birds, aquatic mammals, amphibians, fish, aquatic plants and invertebrates. 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 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 East Cascades in Washington and northern Oregon resulted from tectonic uplift and subsequent erosion by alpine glaciers and landslides. The Rocky Ledge fault trends northwesterly about three miles to the south of the transfer property (CDMG, 1994).
