modoc plateau geology
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. Get this from a library! There are no septic tanks or wastewater disposal systems proposed as part of this project, therefore this item is not applicable. 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. The rocks likely formed much further away from the Sierras and were relocated by the dramatic movements of faults. 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. 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. Modoc Plateau: Average elevation 1370 m (4500 feet) Predominant rocks: Late Cenozoic volcanics, especially basalts in the Modoc Plateau, andesites and dacites in the Cascades Plate tectonic setting: Andean-style volcanic arc in the Cascades, Basin and Range volcanoes in the Modoc Plateau Most recent eruptions: Lassen, 1914-1921 Very large earthquakes that occur closer to the Northern California coast could cause damaging levels of ground shaking here too. Pahoehoe vs. aa lavas. 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. As a registered user, you can customize maps, save them, and share them with your friends. A machinist leased the property and used windmills to get small remaining amounts of oil out. In Washington, much of the ecoregion is within the ceded lands and usual and accustomed fishing areas of tribes. 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. Without continuous dredging, San Diego Bay would fill with sediment and become dry land with deposition from the San Diego, Sweetwater and Otay rivers. The area extends north to the Oregon border and south to include the Skedaddle Mountains and the Honey Lake Basin. The Whipp-Cupvar Complex, 0 to 2 percent slope soils occupy the central, northern portion of the southern half of the site. Gas was first consumed in Stockton in the 1850s and the massive Rio Vista gas field was discovered in 1936. . 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. It also interfingers with up 23,000 feet of volcanic rocks in the Rogue Formation. In fact, the East Cascades support an unusually high aquatic biodiversity among ecoregions in the U.S., including a large number of endemic freshwater snails and fish. [13]. 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). 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. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. The plateau is capped with scattered small, young cinder cones and basalt flows. Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. The plateau is cut by many north-south faults. 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. A few may date earlier, like the 400 million year old Mule Mountain. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. The California Geological Survey's interactive geological map allows users to identify the different rock types and fault lines throughout California. Very hot and fluid, but low in volatile content. Water erosion hazard for bare soil is low to moderate, while the wind erosion hazard is low (refer to TableVI-1). 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. Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915. A snow pack develops at higher elevations. 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. In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. 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. 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. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. Consequently, these soils will continue to remain submerged on an annual basis. Depth to oil is very shallow in the Santa Barbara Channel fields, at only 300 feet below the sea floor. They have a Capability Class rating of II and are considered Prime Farmland when irrigated (NRCS, 2000). 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. [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). 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. Characteristics of basaltic magma. Geological Survey of Canada, Open File 5529. Henhill Silt Loams are classified as neutral to slightly alkaline and have moderate shrink-swell potential. Older alluvium, lake, playa, and terrace deposits. 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. Geology Below the bays, is the Merced Formation, with 45000 feet of marine rocks overlain by 500 feet of terrestrial sedimentary rocks and capped with more modern sediments from the Sacramento River. Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary. [J Curtis Kramer; Geological Society of Sacramento. It is the only state with all three types of plate boundaries, an extraordinary history of earthquakes and volcanoes, and it has many rocks and minerals found nowhere else. 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 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. 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! Additionally, each of the properties lie within or adjacent to an Alquist-Priolo Fault-Rupture Study Zone. Reviews aren't verified, but Google checks for and removes fake content when it's identified. Major Pierson Reading found gold in 1848 in the Trinity River near Douglas City. Eruptions relatively quiet, but spectacular. Throughout the Jurassic the Nevadan Orogeny accelerated with large-scale granitic intrusions and erosion into deep marine basins. Based on the presence of flat-topped guyot undersea volcanoes with geology similar to the bedded cherts and pillow lavas of the Before a development permit is granted for a site within a seismic hazard zone, a geotechnical investigation of the site has to be conducted and appropriate mitigation measures incorporated into the project design. The tribes manage tribally-owned lands on reservations and are also involved in monitoring and research activities on ceded lands. [11]. 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. Most of the Modoc National Forest is covered by basaltic lava flows. AmeriCorps Forestry Technicians will perform a wide variety of activities to support all stages of project work. These rocks are rich in plagioclase, quartz and chlorite mica (which gives them a greenish color) and range up to 25,000 feet thick. Tertiary pyroclastic and volcanic mudflow deposits. These soils have formed in dissected lacustrine terraces from alluvium derived from diatomite lacustrine deposits (NRCS, 2000). 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. Read more Print length 384 pages Additionally, the Burney Falls area could be affected by regional volcanic events originating within the Mt. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. 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]. 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. The Transverse Ranges are poorly drained by streams, but subject to periodic intense flooding, typically every 20 to 25 years. [Age is early Tertiary (Eocene).] 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. 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 What people are saying - Write a review. Creating your LandScope profile is fast, free, and simple. The Modoc Plateau is a large volcanic tableland in the northeast corner of the state. They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). Adherence to standard grading practices as required by the grading permit would ensure that the impacts from erosion would be less-than-significant. 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). This added metavolcanic and metasedimentary rocks to the slowly building Sierras. 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. By contrast, the Eastern Klamath Plate is made up of limestone, chert and pyroclastic rocks, divided in half by the Trinity ophiolite. For much of the Cenozoic the region was filled with lakes and brackish swamps. They are small in area and are thought to represent a higher-grade metamorphic environment than the slate belt, and may have formed through subduction, when one plate slid beneath another. 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. Some soils are found in each property while others are more or less restricted to one portion of the property. Further, DPR is bound by its General Plan with respect to Burney Falls and must conduct a CEQA review for any activities which deviate from the approved plan. 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 combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. Rainbow (Oncorhynchus mykiss) and cutthroat trout are the common cold water inhabitants. Sandstone, shale, and conglomerate; in part Miocene and Eocene. The Transverse Ranges extend from Point Arguello to Joshua Tree National Park, bounded by the San Andreas Fault to the north. All Rights Reserved. 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. 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. The only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. These soils have a Capability Class rating of III to IV, due to erosion hazards and are not considered to be Prime Farmland (NRCS, 2000). 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 . Potassium-argon ages on rocks in unit from southeast Oregon range from about 13 to 16 Ma; lenses of interbedded tuffaceous sedimentary rocks locally contain a Miocene (Barstovian) vertebrate fauna, Plugs and domal complexes of rhyolitic, rhyodacitic, and dacitic composition; includes related near-vent flows, flow breccia, and deposits of obsidian, perlite, and pumice. As with its flora, this diversity arises as a result of topography, unique climate, geology, and ecological isolation. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. The variety of habitat types in the East Cascades has led to a unique and diverse flora and fauna. Compared with the Sierra Nevada, rocks from this time period tend be more calcic than silicic. Unique geology in the region formed bastnaesite mined at the Mountain Pass rare earth mine. The bulk of the plateau is composed of ancient lava flows and volcanic tuff dating back between 10 and 2 million years ago during the Tertiary period. Shield volcanos. [16]. Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. The Seismic Hazards Mapping Act was developed to protect the public from the effects of strong groundshaking, liquefaction, landslides, or other ground failure, and from other hazards caused by earthquakes. Geothermal systems with evidence of magmatic heat . The Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. 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. Several potassium-argon ages ranging from about 4 to 7 Ma indicate unit is mostly of early Pliocene and late Miocene age. 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. Reference: Chorlton, L.B. 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. Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. Extensive marine and nonmarine sand deposits, generally near the coast or desert playas. The Modoc exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). 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. The Rocky Ledge fault trends northwesterly about three miles to the south of the transfer property (CDMG, 1994). The plateau is thought to have been formed approximately 25 million years ago. Historically, 20 percent of the four million ounces of gold mined in California originated in the Klamath Mountains. Anadromous fish such as steelhead, coho and Chinook salmon inhabit East Cascade streams and rivers. Geothermal systems with evidence of magmatic heat, associated wi It is in northeastern California about 50 km (31 mi) south of Klamath Falls, Oregon. Petroglyph Point is an imposing cliff marked with the cultural symbols of the Modoc People, who have lived here for thousands of years. Geologists have subdivided the four terranes in the mountain range, referring to them as "plates.". Joint surfaces and cavities commonly lined with hematite or montmorillonite clay, secondary silica minerals, zeolites, celadonite, or calcite. In the 19th century, a railroad pier was built out into the canyon to avoid waves closer in to shore when loading and unloading ships. This is considered a less-than-significant impact. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). Five Holocene Faults including the McArthur, Mayfield, Pittville, Hat Creek, and Rocky Ledge faults are all located within 20 miles of the property. 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. Project work may include post fire recovery efforts. 27 Permit, which requires agreement with the USFWS and a water certification or waiver. The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). Dugan and Graven soils are comprised of soils formed on mounds and stream terraces from alluvium of extrusive igneous rocks. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. 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. California has 435 recognized alliances and within those more than 1,200 vegetation associations exist. [15] [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. 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). Serious flooding in 1862 created a three mile wide lake in the Santa Ana River, while serious flooding in 1938 inundated the San Fernando Valley and parts of the Los Angeles coastal plain, damaging 100 bridges and killing 43 people. 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. Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene. Hill (1915) published a sketch map of the geology of.the High-grade mining district, a small gold district in the north Warner Mountains. Special attention shall be provided to erosion prone hillside areas, including extremely erodible soils types such as those evolved from decomposed granite. 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 Southern unglaciated Allegheny Plateau is a maturely dissected plateau characterized by high hills, sharp ridges and narrow valleys. 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. We haven't found any reviews in . 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. False. . In places includes interlayers of silicic volcaniclastic rocks and tuffaceous sedimentary rocks. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). 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.