modoc plateau geology modoc plateau geology

California has 435 recognized alliances and within those more than 1,200 vegetation associations exist. Most of the gold historically mined in California originated in the Mother Lode belt, located in the foothills of the western Sierras. 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. An exception is the broad Teays Valley which was created by a large, preglacial river. New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. Tribes are active participants in discussions about natural resources management and conservation activities within their usual and accustomed areas. [2] Cities and counties must regulate certain development projects within the zones, which includes withholding permits until geologic investigations demonstrate that development sites are not threatened by future surface displacement (Hart, 1997). It formed as a sandspit filled in to the north from sediment deposited by the Tijuana River and sheltered from wind and waves by the Cretaceous uplands of Point Loma. Franciscan rocks have a complex geological structure. Therefore, it is located within a zone of crustal weakness that likely provides a preferred pathway formagmasto reach the surface; the regional fault trends are the primary control onventlocations. Some Great Valley rocks are exposed in the Coastal Ranges as well, like the Jurassic Knoxville Formation shale. 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. [9]. Sign in with your username (email address) and password. Commonly flow banded; locally glassy. With much of the bays only 30 feet deep, human activity has accelerated erosion and filling due to historical hydraulic mining and farming. May include some rocks of middle Miocene age in the area west and northwest of Lakeview. Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Lava lakes. It is lonely country out in the Modoc. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. 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. CA 36: Red . [15] 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. It is composed of layers of volcanic flows and periodic volcanic uplifts. 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. However some areas are virtually devoid of vegetation, due to deficient nutrient supplies (NRCS, 2000). The area extends north to the Oregon border and south to include the Skedaddle Mountains and the Honey Lake Basin. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. Identify Priority Places: A Practitioner's Guide, Cumberlands and Southern Ridge and Valley, Willamette Valley-Puget Trough-Georgia Basin. To determine the nature of the differences between northern and southern Arizona, geologists could: map the geology in detail, take seismic profiles, study drill core, and reconstruct the geologic history between each province. [17]. 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 soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). The Central Valley includes the southern San Joaquin Valley and the northern Sacramento Valley. Technicians will serve vegetation management and fuels reduction efforts, supporting initiatives for healthy, productive, and resilient forest landscapes and resources. For much of the Cenozoic the region was filled with lakes and brackish swamps. At mid elevations, there are areas of Douglas-fir and grand fir (Abies grandis) forests to the north, and white fir and Douglas-fir forests to the south. 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. Therefore, the transfer would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death. Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. 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. [4] and Modoc Cypress (Cupressus bakeri).[5]. 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. Sign In Skip to Main Content Modoc Plateau Flood Basalt Layers Earthcache (GC1X4B5) was created by PathfinderMark on 8/11/2009. The California Coast Ranges extend from the Oregon line southward 600 miles to the Santa Ynez River. The Modoc exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). 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. 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. Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. Project work may include post fire recovery efforts. They have a low hazard from water and wind erosion when exposed. 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 Shasta County General Plan contains a Public Safety Element as required by Section 65302(g) of the California Government Code, which requires that General Plans include an element containing identification and appraisal of seismic and geologic hazards. They are shallow, moderately well drained soils with slow permeability and have a high shrink-swell potential (see TableVI-1). Halemaumau, Mauna Loa Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. They are derived from lake sediments and alluvium, which formed from extrusive igneous rocks. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. 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. Petroglyph Point is an imposing cliff marked with the cultural symbols of the Modoc People, who have lived here for thousands of years. From inside the book . Much more recent Pliocene terrestrial sedimentary rocks are also common in the northern Peninsular Ranges like the San Timoteo Canyon and Mount Eden conglomerate, sandstone and siltstone which are up to 7000 feet thick. The volcano is constructed mainly ofmaficlavas, although drillhole data indicate that a larger volume ofrhyoliteis present than is indicated by surface mapping. These mapped faults include the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults; whereby the McArthur fault trends northwesterly through the site between Big Lake and Horr Pond (CDMG, 1994). Their distribution and numbers are significantly reduced, particularly due to dams that restrict their passage through much of the ecoregion. The Lost River watershed drains the north part of the plateau, while southern watersheds either collect in basin reservoirs[clarification needed] or flow into the large Big Sage Reservoir, which sits in the center of Modoc County. Up to 10,000 feet of sandstone and red shale deposited during the Eocene, after which sea levels dropped in the Oligocene preserved the sand, gravel and silt of the Sespe Formation. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. Polygons from the 1978 State map unit Qp were added where no playa was shown on the county maps. These soils also occupy smaller areas along Fall River in the southern half of the property. They have a low erosion hazard from water when bare and a moderate hazard from wind erosion. The small Conejo field to the east of Camarillo was geologically unusual in that the reservoir rock is fractured volcanic rock from the Miocene. The soils are moderately to strongly alkaline. Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. Mostly nonmarine, but includes marine deposits near the coast. Pyroclastic Rock. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). Hill*s work, however, is of little value in understanding the areal . The east side of the Warner Mountains in particular has exposed rock in the many canyons, including finds of petrified wood and assorted gemstones. Read more Print length 384 pages The three interconnected Suisun, San Pablo and San Francisco bays occupy a structural depression dating to the Pliocene which flooded several times due to Pleistocene glaciations. The Southern unglaciated Allegheny Plateau is a maturely dissected plateau characterized by high hills, sharp ridges and narrow valleys. 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. Around Shasta Reservoir are other copper and zinc deposits in the Triassic-age Bully Hill rhyolite. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. Medicine Lake volcano is located at the intersection of major tectonic features including the northwestern extension of the Walker Lane fault zone. 0 Reviews. Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . These activities include periodic maintenance of levees and roadways, recreational use, and grazing. [12] Andesite and dacite typically have plagioclase, hornblende, and clinopyroxene phenocrysts; some flows aphyric. Source: US geologic names lexicon (USGS Bull. the structural geology and tectonics of mid-ocean ridges and Icelandin 2011. 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. 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. Funding was provided to WDFW through a state wildlife grant from the United [16]. 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. Fossils are common in the marine rocks of the Pacific Beach and Mission Bay formation around San Diego. 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. Borehole Conditions The vault is a horizontal tunnel, located beneath 5 meters of overburden to maintain thermal stability. Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. Get this from a library! The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). It represents an ancient forearc basin that took shape as oceanic crust subducted under the west edge of the continent. Their hazard for water and wind erosion is none to low when bare. Geological Survey of Canada, Open File 5529. Axelrod (1966) reported a K-Ar age of . 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. This project could not have been undertaken without the financial support of The Nature Conservancy's Oregon, Washington and California offices, and the Washington Department of Fish and Wildlife (WDFW). Forest stand patterns on the landscape often reflect this complex fire history. Five Holocene Faults including the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are all located within 20 miles of the property. 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). A small andesitic dome near Marysville is the only example of volcanic rocks in the valley exposed near the surface. The geomorphology of the Sierra Nevada is comparatively recent, dating to as recently as the Quaternary. 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. Includes some Mesozoic rocks. 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. Flows like water in many cases. 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. It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River. 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: These different regions are called geological provinces. 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. Share sensitive information only on official, secure websites. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. Gassaway soils have a Capability Class rating of VIII 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. Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. They have a high shrink-swell potential and have a low water erosion hazard and low wind erosion hazard when bare (see TableVI-1). Thick sequences of marine rocks from the Late Cretaceous through the Paleocene and Eocene are common in the mountains and on San Miguel Island. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. Additionally, the banks of the levees could experience localized landslides and slumps. They are very deep, poorly drained soils with slow permeability and a high shrink-swell potential (see TableVI-1). Most precipitation accumulates from November through April. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. Geology - 156 pages. The plateau is capped with scattered small, young cinder cones and basalt flows. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). These soils formed on stream terraces from alluvium derived from extrusive igneous rocks. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. 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). Grizzly bears and gray wolves no longer occur in the ecoregion, however lynx and wolverines may occasionally visit the northernmost portions. In places includes talus and slope wash. Therefore, aside from naturally occurring erosional processes, no impact is anticipated. [11]. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. This mapping unit is typically found at the base of toe slopes where alluvium from basalt has been deposited. In addition to the web viewer, the GIS data can be downloaded for further use. 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. In some places, ophiolite sequences preserve remnant oceanic crust rock on land, while other parts of the range are intruded with ultrabasic igneous rocks that have serpentinized to peridotite. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). In the northeastern corner of California, lies a massive volcanic plain known as the Modoc Plateau. US 97: Weed-Oregon 294. Find many great new & used options and get the best deals for Roadside Geology of Northern and Central California (paperback) at the best online prices at eBay! See Answer. They are associated with the Whipp-Cupvar Complex, slightly saline, 0 to 2percent slopes mapping unit which occupies a flanking position to the south. Fossil plants and vertebrates indicate an Oligocene and Miocene age. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). Very hot and fluid, but low in volatile content. A .gov website belongs to an official government organization in the United States. Therefore, the volcano may be even larger than the estimated 600 km3(143 mi3, already the largest volcano by volume in the Cascade Range. Deccan Traps in India. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. 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. These soils contain a very deep profile and are somewhat poorly drained with moderately slow permeability. Most of the Modoc National Forest is covered by basaltic lava flows. The volcano is positioned at a kink where northwest-trending faults entering the volcano from the south turn to the northeast, and then back to northwest. It is exposed in the Smith River drainage to the north of US Highway 199 in Del Norte County. 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. It is the only coastal mountain range in the USand potentially North Americawith rocks older than the Phanerozoic. Anadromous fish such as steelhead, coho and Chinook salmon inhabit East Cascade streams and rivers. Three remaining mapping units are located in a band along the southern portion of the property and include the Dugan-Graven Complex, Flooded, 0 to 5 percent slopes, Dugan-Graven Complex, 0 to 5percent slopes, and the Pittville Sandy Loam, 0 to 5 percent slopes occupy this area. They have a moderate hazard for water and wind erosion when bare. 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. Reference: Chorlton, L.B. The basement rocks of the Sierra Nevada date to the Paleozoic and include rocks in the Shoo Fly complex and Grizzly Formation. By contrast, the Trinity ophiolite is found in the east, known for its numerous ultramafic rocks and being one of the most extensive ophiolites in the US. 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 have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. 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. [20] The Bowman Ditch and adjacent area are underlain by Quaternary lacustrine deposits composed of alluvial sediments derived from volcanic materials, water-lain ash deposits, and local diatomaceous detritus (CDMG, 1968). Glacial till and moraines. 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. Rockhounding. Based on the presence of flat-topped guyot undersea volcanoes with geology similar to the bedded cherts and pillow lavas of the These include the Britton Silt Loam, 30 to 50 percent slopes and Burney-Arkright Complex, two to nine percent slopes mapping units. Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. These soils are relatively deep (40 to 60 inches), well drained gravelly loams with moderately slow permeability.