modoc plateau geology

Deep hydrothermal systems active in marine sedimentary rocks as they were being metamorphosed emplaced the gold. Halemaumau, Mauna Loa In the northern end of the county are notable Goose Lake, Tule Lake, and the three lakes of Surprise Valley. SP026: Traveling America's loneliest road: A geologic and natural history tour through 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. This is considered a less-than-significant impact. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. Read more Print length 384 pages Grizzly bears and gray wolves no longer occur in the ecoregion, however lynx and wolverines may occasionally visit the northernmost portions. Volcanic rocks erupted around Barstow in the Triassic. Lithology: Flood basalt(s); mafic volcanic rocks; basalt. The Modoc Plateau has both active volcanoes and faults. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Learn about conservation and open space in your state. 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. Additionally, each of the properties lie within or adjacent to an Alquist-Priolo Fault-Rupture Study Zone. Official websites use .gov Five Holocene Faults including the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are all located within 20 miles of the property. Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. Kokanee (Oncorhynchus nerka) can be found in lakes in the northern and central portions of this ecoregion in Washington. Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. Unit is present in all counties. Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. The southern portion of the ecoregion has extensive valleys and flatlands between the forested mountains and foothills, which include large marshes, irrigated meadows and pastures, and arid juniper and sagebrush steppes. Requires ability to work and study under rigorous conditions. California Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. Geologic units in Modoc county, California - USGS They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. Shelf and slope deposits would ultimately become Great Valley rocks, while the trench deposits became the Franciscan subduction complex. Because the mountain range is young only a very narrow coastal plain has developed around Santa Barbara. 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. [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. Recent lava flows comprise approximately 60 percent of this complex and are characterized by sharp, jagged, broken blocks piled in tumbled heaps and have many crevices, sinkholes, and collapsed lava tubes. 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. The Oldest Rocks: The Piedmont and Blue Ridge 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! This property could potentially be subjected to ground motion from displacement along any of these local and regional faults. 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. 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. 27 Permit, which requires agreement with the USFWS and a water certification or waiver. 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! [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 are rich in plagioclase, quartz and chlorite mica (which gives them a greenish color) and range up to 25,000 feet thick. Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene. Characteristics of basaltic magma. Lava Beds National Monument contains the best examples of these, although numerous locations boast similar features, such as the Ahjumawi Lava Springs. 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. Geologic units in Modoc county, California Additional scientific data in this geographic area Quaternary volcanic flow rocks, unit 1 (Cascade Volcanic Field) (Quaternary) at surface, covers 37 % of this area Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. 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. Additionally, borate deposited during arid conditions, with mining after 1926. Groundwater-Quality Data in the Cascade Range and Modoc Plateau - USGS [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. California's Amazing Geology - Donald R. Prothero - 9781498707954 The mountains are drained by the Russian, Eel, Mad and Klamath rivers which tend to follow faults and folds. [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. 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. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. We'll be adding other personal features soon. 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. Ships from Sacramento, CA. Dominant land uses are forestry, livestock grazing, recreation and conservation. The area formed as a series of small island arcs, deep-ocean sediments and mafic oceanic crust accreted to the western edge of North America, producing a series of deep basins and high mountain ranges. The Central Valley includes the southern San Joaquin Valley and the northern Sacramento Valley. 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. Furthermore, the McArthur Fault bisects the property and is designated as an Alquist-Priolo Fault-Rupture Study Zone. wikipedia.en/Outline_of_California.md at main - github.com 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. 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. [20] Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. 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. 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. 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. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. California Geological Survey External Resources This product is available, please note the publication series and number, and then contact: California Geological Survey Publications 801 K Street MS 14-34 Sacramento, CA 95814-3532 Phone: (916) 327-1850 Fax: (916) 327-1853 Email: cgspubs@conservation.ca.gov In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. 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. Basaltandbasaltic andesitedominate the lower flanks, but higher on the volcano,basalticlavas are mostly absent,andesitedominates, and high-silicalavas are present. These are Jurassic and Cretaceous age greywacke, chert, basalt, ultrabasic rocks and serpentinite from modified oceanic crust. 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. Geology | South Carolina Encyclopedia The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. A .gov website belongs to an official government organization in the United States. The Lost River watershed drains the north part of the plateau, while southern watersheds either collect in basin reservoirs[clarification needed] or flow into the large Big Sage Reservoir, which sits in the center of Modoc County. 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. [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). These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. Therefore, the Shasta County Building division would not be required to issue a development permit. Consequently, these soils will continue to remain submerged on an annual basis. Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. The ecoregion includes a large pumice zone in central Oregon, dominated by lodgepole pine (Pinus contorta), one of the very few places where the species is the climax tree (not replaced by other conifers if fire is suppressed). Click here to use the California geological interactive map Source: California Geological Survey Broad valleys occupy the lowlands between the mountain ridges. 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. Gold appears in quartz veins that cut through slate, siltstone and shale originating in the Shasta Bally batholith. NGMDB Product Description Page Andesite and dacite typically have plagioclase, hornblende, and clinopyroxene phenocrysts; some flows aphyric. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. 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). [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. in Geology from Syracuse University with a focus on. The soils are moderately to strongly alkaline. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. Many of the ash--flow tuffs exhibit flow features and only obscure vitro-clastic textures. 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. Modoc Plateau Flood Basalt Layers Earthcache EarthCache Special attention shall be provided to erosion prone hillside areas, including extremely erodible soils types such as those evolved from decomposed granite. Creating your LandScope profile is fast, free, and simple. Both of these provinces have substantial geothermal resource base and resource potential. Modoc Plateau - Wikipedia These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). Young Volcanoes: the Cascades and Modoc Plateau It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. Franciscan rocks have a complex geological structure. The Peninsular Ranges were never glaciated during the Pleistocene. The McArthur Swamp, Bowman Ditch, and the Ahjumawi Property are located within or adjacent to the McArthur Fault-Rupture Zone. Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. The Whipp-Cupvar Complex, 0 to 2 percent slope soils occupy the central, northern portion of the southern half of the site. Gold has been recovered along the eastern margin of the Great Valley, where it was derived from the Sierra Nevada. The only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. 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. 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. Subalpine fir (Abies lasiocarpa), mountain hemlock (Tsuga mertensiana) and Engelmann spruce (Picea engelmannii) are found at higher elevations, with mountain hemlock replaced by Shasta red fir in the Upper Klamath Basin. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. As shown, may include some rocks older than Oligocene, correlative with upper parts of unit Tea. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. Virtually all of the islands in the bay are man-made from dredged sediments. From inside the book . 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 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. 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. 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. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. Pyroclastic Rock. The plateau supports large herds of Mule Deer (Odocoileus hemionus), Rocky Mountain Elk (Cervus canadensis), and Pronghorn (Antilocapra americana). 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). PDF DREW SILER - geologica.net 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. Comments: Columbia Plateau. 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. 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). The plateau is thought to have been formed approximately 25 million years ago. Project work may include post fire recovery efforts. PDF Modesto Junior College Course Outline of Record Report Following the exchange, Burney Falls and Bowman Ditch will be protected from major construction and other soil disturbing activities by the legal restrictions applicable to State parklands. Axelrod (1966) reported a K-Ar age of . These soils are moderately deep, moderately well drained and have slow permeability. There are also several herds of wild horses on the plateau. Better run fast! Some Great Valley rocks are exposed in the Coastal Ranges as well, like the Jurassic Knoxville Formation shale. 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. Therefore, a less-than-significant impact is expected. Fissure eruptions. Free shipping for many products! . 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. Recent (Holocene) volcanic flow rocks; minor pyroclastic deposits; in part Pleistocene. Oil drilling in the Wilmington field cause up to 30 feet of subsidence at the eastern end of Terminal Island between 1937 and 1958. What people are saying - Write a review. One potassium-argon age of about 28 Ma on porphyritic hornblende andesite from Sheep Creek, southwest corner of Union County, indicates in part coeval with unit Tsf. Glacial till and moraines. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. [J Curtis Kramer; Geological Society of Sacramento. Most areas are vegetated by such plants as western juniper, ponderosa pine, antelope bitterbrush, manzanita, and Modoc cypress. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. 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. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. Modoc National Forest - PeakVisor Sign In Skip to Main Content Play-fairway analysis for geothermal resources and exploration - USGS The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. Some counties divided the alluvium into younger and older units, and some did not. 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. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). 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 . Locally porphyritic with phenocrysts of alkali feldspar, plagioclase, and minor augite, ferro-hedenbergite, hornblende, hypersthene, or biotite. For much of the Cenozoic the region was filled with lakes and brackish swamps. 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 exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. 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 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. Initially, hydraulic mining was used to get at placer deposits, but it destroyed the landscape and choked rivers with sediments, ultimately being banned the California government in 1884. Nearly 1,000,000 acres (400,000 ha) of the Modoc National Forest are on the plateau between the Medicine Lake Highlands in the west and the Warner Mountains in the east. The Santa Monica Mountains and the Channel Islands are different than the mountains to the north because they have granitic and metamorphic basement rocks more like the Sierra Nevada. The Clear Lake National Wildlife Refuge and Long Bell State Game Refuge are located on the plateau as well. Tertiary pyroclastic and volcanic mudflow deposits. Warren Peak : Climbing, Hiking & Mountaineering : SummitPost Discovering the Colorado Plateau will explore this region through It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. Even moderate shaking . Polygons from the 1978 State map unit Qp were added where no playa was shown on the county maps. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. 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. Also includes minor rhyolite and dacite flows and domes. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. This project could not have been undertaken without the financial support of The Nature Conservancy's Oregon, Washington and California offices, and the Washington Department of Fish and Wildlife (WDFW). [14]. At least 300 lava tubes are known in Lava Beds National Monument, some of which preserve ice year round. Without continuous dredging, San Diego Bay would fill with sediment and become dry land with deposition from the San Diego, Sweetwater and Otay rivers. It represents an ancient forearc basin that took shape as oceanic crust subducted under the west edge of the continent. 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. They have a Capability Class rating of II and are considered Prime Farmland when irrigated (NRCS, 2000). In some places, ophiolite sequences preserve remnant oceanic crust rock on land, while other parts of the range are intruded with ultrabasic igneous rocks that have serpentinized to peridotite. Examples of rock formations in the Franciscan subduction complex include the Calera limestone east of the San Andreas fault or the Laytonville limestone which extends north of San Francisco to Eureka. 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. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. 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. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. Listed on Feb 28, 2023 Quaternary pyroclastic and volcanic mudflow deposits. Geologists have subdivided the four terranes in the mountain range, referring to them as "plates.". The oldest rock in this part of the range is the Santa Monica Slate. The proposed project involves no earthwork at the Burney Falls, Bowman Ditch, and Ahjumawi Properties. Tertiary volcanic flow rocks; minor pyroclastic deposits. Further, DPR is bound by its General Plan with respect to Burney Falls and must conduct a CEQA review for any activities which deviate from the approved plan. This ecoregion has one of the most extensive Ponderosa pine forests in the western U.S., occurring in all parts of the ecoregion, from Wenatchee to Mount Lassen. 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.