modoc plateau geology

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. Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains. The Coast Range is at even higher risk for damaging landslides than other parts of coastal California due to sheared serpentinite in Franciscan basement rocks. Warren Peak : Climbing, Hiking & Mountaineering : SummitPost 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. Most precipitation accumulates from November through April. Also includes minor rhyolite and dacite flows and domes. Soils at the property have been mapped as the Pit Silty Clay, Drained, 0 to 2 percent slopes mapping unit. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. Drillhole data indicate that the plateau surface underlying the volcano has been downwarped by 0.5 kilometer under its center. Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915. The latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. 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. MOD - Modoc Plateau, CA, USA - University of California, Berkeley 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. However some areas are virtually devoid of vegetation, due to deficient nutrient supplies (NRCS, 2000). It is composed of layers of volcanic flows and periodic volcanic uplifts. The Golden State includes both the highest and lowest point in the continental US and practically every conceivable geological feature known. Unconsolidated to semiconsolidated lacustrine clay, silt, sand, and gravel; in places includes mudflow and fluvial deposits and discontinuous layers of peat. In the Modoc Plateau, Douglas-fir becomes less important, western white pine (Pinus monticola) woodlands dominate many areas, and Jeffrey pine (Pinus jeffreyi) and Washo pine (Pinus washoensis) occur with or replace ponderosa pine. Forestry Technician (Lassen NF) | Natural Resources Job Board These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. Additionally, the Burney Falls area could be affected by regional volcanic events originating within the Mt. 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. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. 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). 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). May include some rocks of middle Miocene age in the area west and northwest of Lakeview. 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. doi: 10.4095/223767. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. This produced major crustal stretching, volcanism and displacement of up to 125 miles. 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. Geologists debate how high the early Sierra Nevada were. The color geologic road maps, based on the 2010 Geologic Map of California, are detailed and easy to read. Interactive map of the geology of California | American Geosciences Older alluvium, lake, playa, and terrace deposits. 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. [7], The Klamath Mountains formed as small island arc terranes accreted against the coast of North America before and during the Devonian and overlain by newer rocks, deposited from the Cretaceous to modern times. 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]. The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. Shelf and slope deposits would ultimately become Great Valley rocks, while the trench deposits became the Franciscan subduction complex. Their hazard for water and wind erosion is none to low when bare. Per square mile of drainage, the Eel River has the highest suspended sediment load of any river in the US, exceeding the Colorado River and Mississippi River. 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. Young Volcanoes: the Cascades and Modoc Plateau Forest stand patterns on the landscape often reflect this complex fire history. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. On this Wikipedia the language links are at the top of the page across from the article title. 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. Sign In Skip to Main Content 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. Rainbow (Oncorhynchus mykiss) and cutthroat trout are the common cold water inhabitants. Characteristics of basaltic magma. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. Typical rock formations in the area include volcanic breccia, mud and ash flows, lava flows, lacustrine (lake) deposits, and cinder cone pyroclastic rocks. 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. During the Nevadan orogeny in the Jurassic, extensive folding and faulting altered the rocks and huge granite batholiths erupted. Plant Community Mapping & Monitoring - California Native Plant Society 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. 27 Permit, which requires agreement with the USFWS and a water certification or waiver. In addition to gold, platinum is sometimes found with gold placers. Examples of filled basins included the Los Angeles Basin, the Eel River Basin around Eureka or the 50,000 foot thick sedimentary sequences of the Ventura Basin. Distribution of Gold - Western Mining History The Colorado Plateau Map And Guide To Public Lands On The Colorado Appendix MP. The Modoc Plateau Region - UC Santa Barbara 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. CA 36: Red . Therefore, a less-than-significant impact is expected. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. Thick sequences of marine rocks from the Late Cretaceous through the Paleocene and Eocene are common in the mountains and on San Miguel Island. Requires ability to work and study under rigorous conditions. [14]. The Poway Formation has rounded metavolcanic pebbles with no known source nearby, suggesting an original source somewhere in Sonora before a major offset to the north by faults. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. Policy SG-e - When soil tests reveal the presence of expansive soils, engineering design measures designed to eliminate or mitigate their impacts shall be employed. In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. Basalt flows, flow breccia, and basaltic peperite; minor andesite flows; some interbeds of tuff and tuffaceous sedimentary rocks. 896, p. 1018-1019). The soils have a Capability Class rating of IV and are not considered Prime Farmland. As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). This is considered a less-than-significant impact. Substantially folding at the edge of the valley creates famous oil producing dome structures like Lost Hills and Kettleman Hills. Polygons from the 1978 State map unit Qp were added where no playa was shown on the county maps. In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. [8], 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. 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. These soils also occupy smaller areas along Fall River in the southern half of the property. Technicians will serve vegetation management and fuels reduction efforts, supporting initiatives for healthy, productive, and resilient forest landscapes and resources. In places includes flows of platy olivine andesite or basaltic andesite. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. Miners extracted placer gold or dug up fossil placers in the Weaverville Formation and Hornbrook Formation. 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. Modoc National Forest - PeakVisor They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). 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. Geological Survey of Canada, Open File 5529. The province covers an area of 337,000 km2 (130,000 mi2) within western Colorado, northwestern New Mexico, southern and eastern Utah . Additionally, when polygons have been edited and changed to alluvium, Qal was used as the general value; hence it now is present in all counties. Sandstone, shale, and conglomerate; in part Miocene and Eocene. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. US 97: Weed-Oregon 294. [5][6], The distinctive Coronado Island in San Diego County helps to create the large sheltered harbor of San Diego. Locally includes soils containing abundant organic material, and thin peat beds. and late Miocene in age (see Fiebelkorn and others, 1983), flows of Deer Butte Formation of Kittleman and others (1967), and extensive unnamed flow sequences in the Basin-Range and Owyhee Upland Provinces of southern Lake, Harney, and Malheur Counties that are younger than Steens Basalt, dated at about 15 Ma (Baksi and others, 1967) and the Owyhee Basalt, dated at about 14 Ma (Bottomley and York, 1976; see also Fiebelkorn and others, 1983), and older than 7 or 8 Ma. 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. Therefore, aside from naturally occurring erosional processes, no impact is anticipated. 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). 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. [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. A machinist leased the property and used windmills to get small remaining amounts of oil out. Fossils are common in the marine rocks of the Pacific Beach and Mission Bay formation around San Diego. Fountains. 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. It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. Kokanee (Oncorhynchus nerka) can be found in lakes in the northern and central portions of this ecoregion in Washington. Glacial till and moraines. Most of these wetlands have been drained and converted to agriculture. Very large earthquakes that occur closer to the Northern California coast could cause damaging levels of ground shaking here too. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Should one of the local faults in the area experience displacement, the McArthur Swamp could potentially experience levee failures from ground lurching and/or lateral spreading. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas. 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). Agency The Great Basin Institute Location Susanville, CA Job Category Temporary/Seasonal Positions Salary ~ $1,680 Bi weekly Start Date 05/22/2023 Last Date to Apply It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River. 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 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 vast tableland between the Cascades and the Warners is referred to as the Modoc Plateau. 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. Over 40 different oil and gas fields are found in association with the Transverse Ranges and their surrounding basins. Borehole Conditions The vault is a horizontal tunnel, located beneath 5 meters of overburden to maintain thermal stability. 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). In addition to the web viewer, the GIS data can be downloaded for further use. The Franciscan subduction complex makes up the basement rock for part of the range, with a mlange dominated by graywacke first deposited in offshore deep ocean basins. 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. Throughout the Jurassic the Nevadan Orogeny accelerated with large-scale granitic intrusions and erosion into deep marine basins. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. Medicine Lake volcano lies in a strongly east-west extensionaltectonicenvironment slightly east of the main Cascade Range arc axis on the Modoc Plateau in northern California. True. Unit is present in all counties. Roadside Geology of Northern and Central California|Paperback Bull trout occur within the ecoregion but their range has been significantly reduced. It is mostly interchangeable with Qal, except that it implies some specifically younger Quaternary deposits. 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. A .gov website belongs to an official government organization in the United States. 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). Modoc Plateau Flood Basalt Layers Earthcache EarthCache "[1], It is a thick accumulation of lava flows and tuff beds, along with many small volcanic cones. The River | Fall River Conservancy Geological Gems of State Parks 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. 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 County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. 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. PDF DREW SILER - geologica.net Links to Completed Ecoregional Assessments. Commonly flow banded; locally glassy. MOD - Modoc Plateau, CA, USA. Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. 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. 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. Share sensitive information only on official, secure websites. Some Great Valley rocks are exposed in the Coastal Ranges as well, like the Jurassic Knoxville Formation shale. Tribes are active participants in discussions about natural resources management and conservation activities within their usual and accustomed areas. The volcano is constructed mainly ofmaficlavas, although drillhole data indicate that a larger volume ofrhyoliteis present than is indicated by surface mapping. 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! As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. 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. Compared with the Sierra Nevada, rocks from this time period tend be more calcic than silicic. Historically, fires occurred at irregular intervals from under 10 years in the lowland foothills to 150 years or more at high elevations. Roadside Geology of Northern and Central California They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). Free shipping for many products! There are also several herds of wild horses on the plateau. 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. Hill*s work, however, is of little value in understanding the areal . Geology - 156 pages. Site is located on private property in Modoc County, California, approximately 10 kilometers from the Oregon border and 20 kilometers from the Nevada border. They are associated with the Whipp-Cupvar Complex, slightly saline, 0 to 2percent slopes mapping unit which occupies a flanking position to the south. 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. From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. [4]. Geology. Geologists have subdivided the four terranes in the mountain range, referring to them as "plates.". 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. Water erosion hazard for bare soil is low to moderate, while the wind erosion hazard is low (refer to TableVI-1). "Occasioned lakes, marshes, and sluggishly flowing streams meander across the plateau. As shown, may include some rocks older than Oligocene, correlative with upper parts of unit Tea. Geologic guide to the Modoc Plateau and the Warner Mountains : annual 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. These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. With the exception of some metasedimentary and metavolcanic rocks, most rocks in the Peninsular Ranges are igneous and Jurassic in age, dating to the time of the Nevadan orogeny. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. "Modoc County has an area of 3823 square miles. Geothermal systems with evidence of magmatic heat . [15] Gold appears in quartz veins that cut through slate, siltstone and shale originating in the Shasta Bally batholith. Warner Mountains : Climbing, Hiking & Mountaineering - SummitPost 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 McArthur Swamp and the Glenburn Dredge Site are located within the same regional geographical area and geomorphic province as the McArthur-Burney Falls Memorial Park. The 7.6 magnitude 1952 Kern County earthquake was one of the most powerful in California in the 20th century. They have a moderate hazard for water and wind erosion when bare. Modoc National Forest - Special Places - US Forest Service Second edition. It is also known for scores of lava-tube caves and for well-preserved young volcanic features. 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. Oregon white oak (Quercus garryana) woodlands occupy lower elevations near the Columbia River in the central portion of the ecoregion and also the western parts of the Modoc and Upper Klamath Basin sections in the south. These soils have a Capability Class rating of III to IV and are considered Prime Farmland when irrigated (NRCS, 2000). As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. Use the interactive map to zoom smoothly from a national view to state and local perspectives anywhere across the country. The Santa Ynez Mountains extend up the coast of Santa Barbara County and contain Franciscan basement rocks (also referred to as the Franciscan basement complex) like the Coast Ranges. The east side of the Warner Mountains in particular has exposed rock in the many canyons, including finds of petrified wood and assorted gemstones. It represents an ancient forearc basin that took shape as oceanic crust subducted under the west edge of the continent. [13]. 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.

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