modoc plateau geology modoc plateau geology

High Cascades and the Modoc Plateau Road Guides 294. Lake beds interbedded with volcanic ash are typical of the Cenozoic. 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. At least 300 lava tubes are known in Lava Beds National Monument, some of which preserve ice year round. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. The vast tableland between the Cascades and the Warners is referred to as the Modoc Plateau. The small Conejo field to the east of Camarillo was geologically unusual in that the reservoir rock is fractured volcanic rock from the Miocene. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. Five Holocene Faults including the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are all located within 20 miles of the property. . Select Mineral List Type The Kern River and San Joaquin River both run in valleys "refilled" with lava. Soils at the property have been mapped as the Pit Silty Clay, Drained, 0 to 2 percent slopes mapping unit. Thick Miocene sediments formed in narrow seaways from the Pacific. Most of the gold deposits date to the Cretaceous and formed in narrow belt around the Melones fault in quartz veins. Before the end of the Oligocene, sea levels rose again leaving behind the Vaqueros Formation and then the Miocene deep water silt and clay of the Rincon Formation. 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. During the Jurassic, many sediments shed into the region from the rising proto-Sierra Nevada. Copyright 2023 NatureServe. [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. Project work may include post fire recovery efforts. 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 Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. 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 latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. These soils formed in basins from fine-textured alluvium from extrusive and basic igneous rock. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. Many of these schists, like the Condrey Mountain schist are more resistant to erosion than other rocks close by. SP026: Traveling America's loneliest road: A geologic and natural history tour through 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. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. Geologists debate how high the early Sierra Nevada were. The plateau supports large herds of Mule Deer (Odocoileus hemionus), Rocky Mountain Elk (Cervus canadensis), and Pronghorn (Antilocapra americana). 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. 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. Modoc Plateau. Additionally, the banks of the levees could experience localized landslides and slumps. These soils are also basin soils and formed from alluvium derived from extrusive igneous rock. Comments: Columbia Plateau. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. Each of the proposed transfer properties are located within a seismically active region and could experience significant groundshaking and/or earthquake induced landslides resulting from displacement along one of the following Holocene Faults including the, McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults. Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. Throughout the Jurassic the Nevadan Orogeny accelerated with large-scale granitic intrusions and erosion into deep marine basins. It is composed of layers of volcanic flows and periodic volcanic uplifts. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. Geologic Guide to the Modoc Plateau and the Warner Mountains: Annual Field Trip Guidebook of the Geological Society of . 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 gold, platinum is sometimes found with gold placers. On this Wikipedia the language links are at the top of the page across from the article title. Official websites use .gov Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. Oil drilling in the Wilmington field cause up to 30 feet of subsidence at the eastern end of Terminal Island between 1937 and 1958. 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. Uplift took place into the Pliocene and Pleistocene, slowly reducing sea levels inland in the Central Valley. False. Oil was first extracted in 1850 from the Pico Canyon field, close to Newhall with larger-scale production by 1875. [3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). 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. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. ADVERTISEMENT About 85 percent of mercury produced in the US throughout its history was mined in the Coast Ranges, with about $200 million worth extracted between 1850 and 1980. It also interfingers with up 23,000 feet of volcanic rocks in the Rogue Formation. Examples include the Silverado Formation with 1400 feet of Paleocene terrestrial sedimentary rock in the Santa Anas or the Eocene Poway Formation near San Diego. 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. In the late 20th century, enough gold was found in association with the mercury, arsenic, tungsten and thallium to open the McLaughlin mine in the Mayacmas Mountains around Knoxville. 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. Additionally, each of the properties lie within or adjacent to an Alquist-Priolo Fault-Rupture Study Zone. Creating your LandScope profile is fast, free, and simple. The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse Range. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. By contrast, the Eastern Klamath Plate is made up of limestone, chert and pyroclastic rocks, divided in half by the Trinity ophiolite. 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. California's Geomorphic Regions Modoc Plateau Location: located east of Cascade Range and adjacent to the Basin & Range Region The Modoc Plateau is the California part of the greater Colombian Volcanic Plateau that extends into Oregon, Washington & Canada Mountains California's Geomorphic Regions: Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have had activity within the last 500years (CDMD, 1994). As with the Bowman Ditch, the Ahjumawi Property is located in a seismically active region with numerous, previously referenced faults and volcanoes situated in the immediate vicinity. 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. [17]. 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 Shasta County General Plan provides the following policies for properties outside of the FERCs jurisdiction as they relate to seismic and geologic hazards: Policy SG-c - Shasta County shall coordinate with state and federal agencies monitoring volcanic activity and shall periodically review and update the Shasta County Emergency Plan with respect to volcanic hazards. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. Upper Klamath Lake is Oregons largest lake and is the biggest remnant of this wetland system. Twenty-five thousand feet of Jurassic marine sediments in the Sacramento Valley do not necessarily correspond exactly to the height of the mountains, but fist-sized cobbles in conglomerates from the Cretaceous suggest steep conditions and potentially higher altitudes than today. Modoc Plateau, and West Cascades Ecoregional Assessments. Commonly flow banded; locally glassy. In some places they are interbedded with shale, limestone and radiolarian chert. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). These soils have formed in dissected lacustrine terraces from alluvium derived from diatomite lacustrine deposits (NRCS, 2000). These soils also occupy smaller areas along Fall River in the southern half of the property. GitHub export from English Wikipedia. This produced major crustal stretching, volcanism and displacement of up to 125 miles. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. Drillhole data indicate that the plateau surface underlying the volcano has been downwarped by 0.5 kilometer under its center. The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. Over 40 different oil and gas fields are found in association with the Transverse Ranges and their surrounding basins. 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. Kokanee (Oncorhynchus nerka) can be found in lakes in the northern and central portions of this ecoregion in Washington. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. The strata form characteristic flat-topped hills, and consist of a succession of light-colored clays and white or yellowish-white sandstones. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. 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. The plateau is capped with scattered small, young cinder cones and basalt flows. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. Chromite weathers out of peridotite in the Josephine ophiolite in Del Norte County and some beach placers close to Crescent City have up to seven percent chromite. 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. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. The Modoc Plateau is part of the larger Columbia Plateau which extends into eastern Oregon and Washington, southern Idaho, northern Nevada and western Wyoming. [Age is early Tertiary (Eocene).] The Fall River Watershed lies within the volcanic terrain of the Modoc Plateau geomorphic province, and is the largest sub-drainage in the middle reach of the Pit River. [14]. The Golden State includes both the highest and lowest point in the continental US and practically every conceivable geological feature known. These rocks are rich in plagioclase, quartz and chlorite mica (which gives them a greenish color) and range up to 25,000 feet thick. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). 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. In the 1960's, NASA astronauts trained for future moon landings in the pumice fields of the highlands. A small andesitic dome near Marysville is the only example of volcanic rocks in the valley exposed near the surface. It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. What people are saying - Write a review. This 6"x9" paperback has 371 pages that are packed with detailed information about California Geology. Ground disturbing activities are prohibited on the Ahjumawi Property by the deed restrictions contained within the Conservation Easement, which will coincide with the property. Funding was provided to WDFW through a state wildlife grant from the United Requires ability to work and study under rigorous conditions. Similar rock formations and patterns are found throughout Ventura County, in the Topatopa Mountains and Pine Mountains. Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary. Geology - 156 pages. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. Wetlands in the ecoregion are home to many birds including bald eagles, geese, ducks, herons, cranes, rails, and various songbirds. Geology Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915.