modoc plateau geology10 marca 2023
Shelf and slope deposits would ultimately become Great Valley rocks, while the trench deposits became the Franciscan subduction complex. 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. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. 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. Medicine Lake volcano is located at the intersection of major tectonic features including the northwestern extension of the Walker Lane fault zone. 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. 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). 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 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. Large mammals are emblematic of the ecoregion, which supports populations of elk, blacktail deer, mule deer, bighorn sheep, mountain lions, and black bears. California Department of Conservation administers a variety of programs vital to California's public safety, environment and economy. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. Forest stand patterns on the landscape often reflect this complex fire history. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. Some counties divided the alluvium into younger and older units, and some did not. The vast tableland between the Cascades and the Warners is referred to as the Modoc Plateau. Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. Based on the presence of flat-topped guyot undersea volcanoes with geology similar to the bedded cherts and pillow lavas of the From inside the book . In addition to gold, platinum is sometimes found with gold placers. 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. A few may date earlier, like the 400 million year old Mule Mountain. Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. On the McArthur Swamp property, grading activities involved with the construction and development of wetland habitat at the Hollenbeak and Ash fields would have the potential to cause accelerated erosion, unless proper erosion control measures are implemented. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. [11]. It is also known for scores of lava-tube caves and for well-preserved young volcanic features. The color geologic road maps, based on the 2010 Geologic Map of California, are detailed and easy to read. Geologists have struggled to define its structural geology with complex sequences of deep ocean crust, upper mantle rock and tectonic melanges. 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. Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene. An official website of the United States government. These soils are moderately deep, moderately well drained and have slow permeability. The proposed project involves no earthwork at the Burney Falls, Bowman Ditch, and Ahjumawi Properties. 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. Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915. See Answer. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. In places includes interlayers of silicic volcaniclastic rocks and tuffaceous sedimentary rocks. A snow pack develops at higher elevations. Unique geology in the region formed bastnaesite mined at the Mountain Pass rare earth mine. Modoc Plateau, and West Cascades Ecoregional Assessments. The Mojave Desert extends into areas of Basin and Range terrain and includes some of the oldest rocks exposed at the surface in California. Much of the north-eastern part of the state is actively stretching apart, creating numerous faults, all capable of producing earthquakes. Joint surfaces and cavities commonly lined with hematite or montmorillonite clay, secondary silica minerals, zeolites, celadonite, or calcite. 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. Official websites use .gov . Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. 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. 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. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. 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. These rocks were likely moved to their current location by the two major faults. California was the first place in the US to develop offshore oil drilling in the Summerland field, first found in 1896. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. The exception to this is where the natural drainage regime is altered, as is the case for areas immediately adjacent to the channeled ditch. Broad valleys occupy the lowlands between the mountain ridges. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary. Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene. The tribes manage tribally-owned lands on reservations and are also involved in monitoring and research activities on ceded lands. They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). 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. [Age is early Tertiary (Eocene).] Map unit used in all counties for recent lake beds, playas, and flood plains. 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. Basalt flows, flow breccia, and basaltic peperite; minor andesite flows; some interbeds of tuff and tuffaceous sedimentary rocks. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. Also includes isolated masses of dacitic and rhyodacitic flows, breccia, and ash-flow tuff along eastern slope of Cascade Range that are lapped by flows and sediments of the Madras (or Deschutes) Formation. 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). The Rocky Ledge fault trends northwesterly about three miles to the south of the transfer property (CDMG, 1994). In places contains mollusks or vertebrate fossils indicating Pleistocene age; mostly deposits of late Pleistocene age, but locally includes some deposits of early Holocene age. Reference: Chorlton, L.B. Both of these provinces have substantial geothermal resource base and resource potential. Grizzly bears and gray wolves no longer occur in the ecoregion, however lynx and wolverines may occasionally visit the northernmost portions. Discovering the Colorado Plateau - Bill Haggerty 2021-04-01 The Colorado Plateau is America's western treasure, home to the country's highest concentration of national parks, monuments, wilderness areas, and state parks, and a near-endless bounty of wild, stunning landscape. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. 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. The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). 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. California has some of the most distinctive and unique geology in the United States. Gold appears in quartz veins that cut through slate, siltstone and shale originating in the Shasta Bally batholith. 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. 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). Lithology: Flood basalt(s); mafic volcanic rocks; basalt. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. 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. Identify Priority Places: A Practitioner's Guide, Cumberlands and Southern Ridge and Valley, Willamette Valley-Puget Trough-Georgia Basin. An abundance of species are supported by high elevation meadows, parklands and forests: low-elevation dry forests, oak woodlands, cliffs and talus slopes, riparian corridors, and a variety of aquatic habitats. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. 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. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. 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. The Western Jurassic Plate stretches for 220 miles on the western edge of the mountains. Older alluvium, lake, playa, and terrace deposits. In some areas, decades of fire suppression have resulted in large areas of dense, fire-prone forest. The Modoc Plateau is a volcanic table land approximately 4,000 to 6,000 feet above mean sea level. This mapping unit is typically found at the base of toe slopes where alluvium from basalt has been deposited. Movement along the Sierra Nevada fault helped to create the new Muir Crest and parts of the mountain range rose up to 10,000 feet over the last three million years, creating a steep face to the west of Owens Valley. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. "Occasioned lakes, marshes, and sluggishly flowing streams meander across the plateau. Based on faulting in recent alluvial material, the Surprise Valley fault zone is still active. Project work may include post fire recovery efforts. 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. Modoc Plateau. [17]. 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. As indicated by PG&E in their PEA, wetland construction work will be completed under a USACOE Nationwide No. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor.