modoc plateau geology

The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. 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. 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. They have a low hazard from water and wind erosion when exposed. 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. From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. The Modoc Plateau is a volcanic table land approximately 4,000 to 6,000 feet above mean sea level. Britton Silt Loams, 30 to 50 percent slopes soils are characterized as being relatively shallow (10 to 20inches), and well drained with moderately slow permeability. Modoc Plateau, and West Cascades Ecoregional Assessments. 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. Rockhounding. Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary. These activities include periodic maintenance of levees and roadways, recreational use, and grazing. Commonly flow banded; locally glassy. As a registered user, you can customize maps, save them, and share them with your friends. Whipp soils account for approximately 60 percent of these map units, while Cupvar soils account for approximately 25 percent. Flows like water in many cases. Activities planned for the McArthur Swamp after the ownership transfer would not differ substantially from historic activities undertaken in the area since site reclamation earlier in the century. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. Volcanic rocks erupted around Barstow in the Triassic. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. [15] 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. 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. A thrust fault, known as the Trinity or Bully Choop thrust, separates the Eastern Klamath Plate from the Central Metamorphic Plate. 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. The Fall River Valley and McArthur-Burney Fall Memorial State Park are located at the southern end of the Cascade Range within the Modoc Plateau Geomorphic province. The Modoc Plateau has both active volcanoes and faults. Andesite and dacite typically have plagioclase, hornblende, and clinopyroxene phenocrysts; some flows aphyric. Major uplift was going on in Pleistocene, with some marine terraces raised 1000 feet. Older alluvium, lake, playa, and terrace deposits. 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]. Ships from Sacramento, CA. Geothermal systems with evidence of magmatic heat . It is also known for scores of lava-tube caves and for well-preserved young volcanic features. The water erosion hazard on these soils is low, while the wind erosion hazard is moderate, due to the high percentage of silt (refer to TableVI-1). [12] 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. 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! The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. 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. The Modoc Plateau is part of the larger Columbia Plateau which extends into eastern Oregon and Washington, southern Idaho, northern Nevada and western Wyoming. Additionally, borate deposited during arid conditions, with mining after 1926. [17]. Based on faulting in recent alluvial material, the Surprise Valley fault zone is still active. 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. These soils are very similar to those discussed for the Bowman Ditch and Ahjumawi Property. Even moderate shaking . 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. Fast flowing rivers meant that the region has accumulated very little alluvium, except for a rare 400 foot thick deposit in Scott Valley, southwest of Yreka, California. Axelrod (1966) reported a K-Ar age of . Therefore, a less-than-significant impact is expected. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. It also interfingers with up 23,000 feet of volcanic rocks in the Rogue Formation. The Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. Most of the gold deposits date to the Cretaceous and formed in narrow belt around the Melones fault in quartz veins. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. In spite of low rainfall, the numerous lava tubes and volcanic fractures in the plateau produce the Fall River Springs, one of the largest springs in the US. Their distribution and numbers are significantly reduced, particularly due to dams that restrict their passage through much of the ecoregion. GitHub export from English Wikipedia. Official websites use .gov Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. 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. 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. Most precipitation accumulates from November through April. Locally porphyritic with phenocrysts of alkali feldspar, plagioclase, and minor augite, ferro-hedenbergite, hornblende, hypersthene, or biotite. ADVERTISEMENT The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). The volcano is constructed mainly ofmaficlavas, although drillhole data indicate that a larger volume ofrhyoliteis present than is indicated by surface mapping. Anadromous fish such as steelhead, coho and Chinook salmon inhabit East Cascade streams and rivers. Use the interactive map to zoom smoothly from a national view to state and local perspectives anywhere across the country. The Western Jurassic Plate stretches for 220 miles on the western edge of the mountains. 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. Furthermore, the McArthur Fault bisects the property and is designated as an Alquist-Priolo Fault-Rupture Study Zone. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. [3], Forested areas of the plateau include Ponderosa Pine (Pinus ponderosa), as well as other tree species such as California Buckeye (Aesculus californica). This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. The services DOC provides are designed to balance today's needs with tomorrow's obligations by fostering the wise use and conservation of energy, land and mineral resources. 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. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. 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. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. Tertiary pyroclastic and volcanic mudflow deposits. Comments: Columbia Plateau. Recent (Holocene) volcanic flow rocks; minor pyroclastic deposits; in part Pleistocene. Discovering the Colorado Plateau will explore this region through 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. False. 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. In Washington, much of the ecoregion is within the ceded lands and usual and accustomed fishing areas of tribes. 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. 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. Platy flow-jointing common. 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). Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. Around Shasta Reservoir are other copper and zinc deposits in the Triassic-age Bully Hill rhyolite. 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). Fountains. 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. 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. This unit corresponds with unit Tb on the 1978 State map. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. These habitats are a critical part of the Pacific flyway, supporting vast numbers of shorebirds and waterfowl, the densest wintering concentration of bald eagles in the world, and many other wildlife species. 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 Modoc Plateau and surrounding area is a predominantly rural region of northeastern California, southern Oregon, and northwestern Nevada, centered on the Modoc Plateau physiographic province ().In general, the Modoc study area is characterized by elevated heat flow (Williams and DeAngelo, 2011) and some 30 known geothermal systems as identified by thermal springs and wells (Faulds et al . The oldest "roof" rocks in the Peninsular Ranges date to the Paleozoic, such as limestone deposits near Riverside quarried for the concrete industry. 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. Modoc Plateau. Bull trout occur within the ecoregion but their range has been significantly reduced. 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. 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. Ash-flow tuff, lava flows, pumice-lapilli tuff, coarse pumicite, flow breccia, and domal complexes of rhyolitic, rhyodacitic, and dacitic composition; in places includes peralkaline rhyolite and some andesite and andesite breccia. They are derived from lake sediments and alluvium, which formed from extrusive igneous rocks. Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene. It is also known for scores oflava-tubecaves and for well-preserved young volcanic features. 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. As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. Map unit used in all counties for recent lake beds, playas, and flood plains. 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. There are also several herds of wild horses on the plateau. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). Geological Survey of Canada, Open File 5529. Geologists have subdivided the four terranes in the mountain range, referring to them as "plates.". 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). Roadside Geology of Northern and Central California, "Second Edition", 2016, Alt/Hyndman Roadside Geology of Oregon, "Second Edition", 2016, Marli B. Miller 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 purpose of the Alquist-Priolo Act is to regulate development on or near active fault traces to reduce the hazard of fault rupture and to prohibit the location of most structures for human occupancy across these traces. MODOC PLATEAU The Modoc Plateau is a volcanic table land (elevation 4,000- 6,000 feet above sea level) consisting of a thick accumulation of lava ows and tu beds along with many small volcanic cones. These soils developed in basins from stratified alluvium of ash and lacustrine deposits. There is a dramatic moisture gradient across the ecoregion as the precipitation diminishes from the cold, wet Cascade crest (up to 120 inches of precipitation per year) to the warm, dry eastern border with the Columbia Plateau and Great Basin (less than 20 inches per year). 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. [16]. 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 strata form characteristic flat-topped hills, and consist of a succession of light-colored clays and white or yellowish-white sandstones. Soils located on the Ahjumawi Property consist of the Pastolla muck, 0 to 1 percent slopes, which are similar to those located along the Bowman Ditch, except that it is not artificially drained (NRCS, 2000). For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. Unconsolidated to semiconsolidated lacustrine clay, silt, sand, and gravel; in places includes mudflow and fluvial deposits and discontinuous layers of peat. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Creating your LandScope profile is fast, free, and simple. Mostly nonmarine, but includes marine deposits near the coast. 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: Fissure eruptions. The geology of California is highly complex, with numerous mountain ranges, substantial faulting and tectonic activity, rich natural resources and a history of both ancient and comparatively recent intense geological activity. These different regions are called geological provinces. The Transverse Ranges are poorly drained by streams, but subject to periodic intense flooding, typically every 20 to 25 years. 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. By 1861 it already extended 250 feet below ground and produced 970 flasks of mercury a month. These soils are moderately deep, moderately well drained and have slow permeability. Source: US geologic names lexicon (USGS Bull. . They have a moderate hazard for water and wind erosion when bare. Some counties divided the alluvium into younger and older units, and some did not. The movement of the San Andreas Fault and Garlock Fault helped to induce arid conditions during the Cenozoic. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. 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. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. "Modoc County has an area of 3823 square miles. These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. Because the mountain range is young only a very narrow coastal plain has developed around Santa Barbara. It represents an ancient forearc basin that took shape as oceanic crust subducted under the west edge of the continent. Both of these provinces have substantial geothermal resource base and resource potential. 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. . However some areas are virtually devoid of vegetation, due to deficient nutrient supplies (NRCS, 2000). ;] Basaltandbasaltic andesitedominate the lower flanks, but higher on the volcano,basalticlavas are mostly absent,andesitedominates, and high-silicalavas are present. The Modoc Plateau Region (Figure MOD-1) encompasses 22,858 km of the volcanic tablelands east of the Cascade and northern Sierra Nevada ranges in Modoc, Lassen, and Siskiyou counties. The western gray squirrel is at-risk within the ecoregion in Washington as it is restricted to two isolated populations, but populations in Oregon and California are more robust. Includes rhyolite at Owyhee Dam, Jump Creek Rhyolite, and Littlefield Rhyolite, all of Kittleman and others (1965); Dooley Rhyolite Breccia of Gilluly (1937), radiometrically dated at 14.7 0.4 Ma by potassium-argon methods (Fiebelkorn and others, 1983); resurgent domal masses in McDermitt caldera area; and extensive unnamed flows and ash-flow tuffs in the central and southern part of the Owyhee Upland. Includes deltaic gravel and sand and gravel bars, in pluvial lake basins in southeastern part of map area. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. This 6"x9" paperback has 371 pages that are packed with detailed information about California Geology. Glass in tuff and tuffaceous sedimentary rocks is commonly altered to zeolites, clay minerals, and small amounts of opal, chalcedony, orthoclase, and calcite. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. Secure .gov websites use HTTPS Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. In the 1960's, NASA astronauts trained for future moon landings in the pumice fields of the highlands. 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. The Klamath Mountains have several areas of preserved oceanic crust. They are shallow, moderately well drained soils with slow permeability and have a high shrink-swell potential (see TableVI-1). 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 East Cascades in Washington and northern Oregon resulted from tectonic uplift and subsequent erosion by alpine glaciers and landslides. You'll get a detailed solution from a subject matter expert that helps you learn core concepts.

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