modoc plateau geology

A machinist leased the property and used windmills to get small remaining amounts of oil out. 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. the structural geology and tectonics of mid-ocean ridges and Icelandin 2011. 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. North of the San Joaquin River, the mountains have a tilted-block pattern caused the Sierra Nevada fault, which is interpreted as being similar to the more common Basin and Range terrain to the east. 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 color geologic road maps, based on the 2010 Geologic Map of California, are detailed and easy to read. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. Flows like water in many cases. Locally porphyritic with phenocrysts of alkali feldspar, plagioclase, and minor augite, ferro-hedenbergite, hornblende, hypersthene, or biotite. 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. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. We haven't found any reviews in . Some counties divided the alluvium into younger and older units, and some did not. Without continuous dredging, San Diego Bay would fill with sediment and become dry land with deposition from the San Diego, Sweetwater and Otay rivers. 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. 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. As indicated in the Project Description, no substantial construction or physical modifications to structures located at the McArthur-Burney Falls Memorial State Park, Bowman Ditch, and Ahjumawi property are proposed in connection with the transfer of ownership. 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. Modoc National Forest 800 West 12th Street Alturas, CA 96101 (530) 233-5811 Warner Mountain Ranger District PO Box 220 Cedarville, CA 96104 (530) 279-6116 Camping Warren Peak and Patterson Lake The nearest campground is available at Pepperdine Camp, near the trailhead. 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. Gassaway soils occur approximately 30percent of the complex and have formed from eolian deposits in pockets of the broken Lava Flow lands. 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. 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. Areas in the central portion of the northern half of the property contain the Henhill Silt Loam, partially drained, 0 to 2 percent slopes mapping unit. 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. in Geology from Syracuse University with a focus on. The Southern unglaciated Allegheny Plateau is a maturely dissected plateau characterized by high hills, sharp ridges and narrow valleys. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. It is also known for scores oflava-tubecaves and for well-preserved young volcanic features. Fossil plants and vertebrates indicate an Oligocene and Miocene age. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. They have a Capability Class rating of IV and are not considered to be Prime Farmland (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. This unit corresponds with unit Tb on the 1978 State map. In Washington and the rapidly developing areas around Bend in Oregon, timber companies have recently begun to sell their lands in the mid-elevation forest and transition zones to developers. The Rocky Ledge fault trends northwesterly about three miles to the south of the transfer property (CDMG, 1994). The Ahjumawi Property is located immediately adjacent to the southeast of the Bowman Ditch and therefore the subsurface is comprised of similar alluvial sediments and water-lain ash deposits. Comments: Columbia Plateau. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. Geologists have struggled to define its structural geology with complex sequences of deep ocean crust, upper mantle rock and tectonic melanges. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. The western portions of Burney Falls are underlain by Pliocene nonmarine sedimentary rock, comprised chiefly of diatomite, which was deposited in a lacustrine setting. Better run fast! The East Cascades in Washington and northern Oregon resulted from tectonic uplift and subsequent erosion by alpine glaciers and landslides. The province covers an area of 337,000 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah . The plateau supports large herds of Mule Deer (Odocoileus hemionus), Rocky Mountain Elk (Cervus canadensis), and Pronghorn (Antilocapra americana). Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. 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. Study with Quizlet and memorize flashcards containing terms like 11, Cascade Range, Great Valley, Transverse Range, Peninsular Range, Colorado Desert, Coast Ranges, Sierra Nevadas, Mojave Desert, Modoc Plateau, Klamath Mountains, Basin and Range, Mount Whitney, Sierra Nevadas and more. 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. Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. Locally includes resurgent domes related to caldera complexes. He has 1 2+ years of experience conducting and managing geothermal projects Post-Doctoral Fellowships at University of during Nevada, Reno/Great Basin Center for Geothermal Energy and Lawrence . Substantially folding at the edge of the valley creates famous oil producing dome structures like Lost Hills and Kettleman Hills. 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. A .gov website belongs to an official government organization in the United States. The plateau is thought to have been formed approximately 25 million years ago. The Klamath Mountains have several areas of preserved oceanic crust. Deep hydrothermal systems active in marine sedimentary rocks as they were being metamorphosed emplaced the gold. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. Tertiary pyroclastic and volcanic mudflow deposits. Basalt flows, plugs and dikes, some olivine basalt, and andesite and latitic rocks. [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. Much of the remainder of the East Cascades to the north in Oregon is drained by the Deschutes River system, which includes a series of large lakes and reservoirs near its headwaters. Consequently, these soils will continue to remain submerged on an annual basis. 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. Joint surfaces and cavities commonly lined with hematite or montmorillonite clay, secondary silica minerals, zeolites, celadonite, or calcite. 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). 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. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. 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. Historically, fires occurred at irregular intervals from under 10 years in the lowland foothills to 150 years or more at high elevations. 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. It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. They have a low erosion hazard from water when bare and a moderate hazard from wind erosion. Project work may include post fire recovery efforts. In addition to the web viewer, the GIS data can be downloaded for further use. The subsurface is well known from oil wells and oil fields are bounded in the east by the Kern Front fault. 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. Virtually all of the islands in the bay are man-made from dredged sediments. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. The only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. 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. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have had activity within the last 500years (CDMD, 1994). Mostly nonmarine, but includes marine deposits near the coast. The Maps will include liquefaction hazard zones and earthquake-induced landslide hazard zones. Thick Pliocene marine rocks up to 14,000 feet thick are found on the edges of the Santa Clara River Valley and parts of the San Fernando Valley, stretching to Fillmore. The San Onofre Breccia also formed during this period with distinct glaucophane schist, gabbro, limestone and greenschist. The combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. Halemaumau, Mauna Loa These soils are moderately deep, moderately well drained and have slow permeability. The soils are moderately to strongly alkaline. ;] As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. [3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). Geodetic monitoring of transient deformation along the Pacific-North American plate boundary This page integrates daily GPS measurements from ~1500 stations along the Pacific/North American plate boundary, ranging from Alaska to the U.S-Mexico border (click on figure to right). In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. AmeriCorps Forestry Technicians will perform a wide variety of activities to support all stages of project work. This is considered a less-than-significant impact. 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 monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. 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. Policy SG-f - Shasta County shall pursue preparation of development standards based on topography and soil erosion potential in revising its land capability standards pursuant to Policy CO-h. Policy SG-g - Shasta County should comply with the requirements of the Seismic Hazards Mapping Act, when the Seismic Hazards Maps for the County are completed and made available by the State Geologist. New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. A thick sequence of mostly terrestrial sedimentary rocks including the Rosario, Ladd, Trabuco and Williams formations is exposed on the western slope of the Santa Ana Mountains and Santa Ana Canyon, stretching southward to Camp Pendleton, San Onofre, and smaller exposures in Encinitas, Leucadia, Point Loma and La Jolla. The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. The proposed project involves no earthwork at the Burney Falls, Bowman Ditch, and Ahjumawi Properties. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. 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. The majority of the PG&E property is underlain by Quaternary Lake deposits comprising alluvial sediments derived from volcanic lands and water-lain ash deposits. 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. Thick sequences of marine rocks from the Late Cretaceous through the Paleocene and Eocene are common in the mountains and on San Miguel Island. Their distribution and numbers are significantly reduced, particularly due to dams that restrict their passage through much of the ecoregion. These soils formed on stream terraces from alluvium derived from extrusive igneous rocks. Technicians will serve vegetation management and fuels reduction efforts, supporting initiatives for healthy, productive, and resilient forest landscapes and resources. 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 plateau consists of a thick accumulation of lava flows and tuff beds along with many small volcanic cones. 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. 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. Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. [Age is early Tertiary (Eocene).] . They have a low hazard from water and wind erosion when exposed. Tertiary volcanic flow rocks; minor pyroclastic deposits. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. Borehole Conditions The vault is a horizontal tunnel, located beneath 5 meters of overburden to maintain thermal stability. . Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. 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 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 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. 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). A thrust fault, known as the Trinity or Bully Choop thrust, separates the Eastern Klamath Plate from the Central Metamorphic Plate. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. The Western Jurassic Plate stretches for 220 miles on the western edge of the mountains. Over 40 different oil and gas fields are found in association with the Transverse Ranges and their surrounding basins. [4] and Modoc Cypress (Cupressus bakeri).[5]. Geology - 156 pages. For much of the Cenozoic the region was filled with lakes and brackish swamps. 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). Quaternary pyroclastic and volcanic mudflow deposits. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas. 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. Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. 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.

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