modoc plateau geology
They have a moderate hazard for water and wind erosion when bare. [11]. Its main production ran from 1892 to the 1940s, supplying lubricating oil for other refineries. From inside the book . The California Geological Survey's interactive geological map allows users to identify the different rock types and fault lines throughout California. Geology of Northern California Bulletin 190 CA Div of Mines - Etsy [18]. Is usually overlain by a few feet of reddish Pleistocene gravel and rests on Chico formation. The geologic information, particularly for the Klamath Mountains, Modoc Plateau, and northern Sierra Nevada, has been updated to reflect the more recent geologic understanding of these complex areas. 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. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. Two small islands to the north: North Island and South Island have been connected with fill to create the Naval Air Station. Except for being more saline, these latter soils have very similar characteristics as shown in TableVI-1 (NRCS, 2000). The volcano is constructed mainly ofmaficlavas, although drillhole data indicate that a larger volume ofrhyoliteis present than is indicated by surface mapping. Like the Sierra Nevada, the Peninsular Ranges have gentle western slopes and steep eastern faces. The vast tableland between the Cascades and the Warners is referred to as the Modoc Plateau. "[1], It is a thick accumulation of lava flows and tuff beds, along with many small volcanic cones. 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. 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. At least 300 lava tubes are known in Lava Beds National Monument, some of which preserve ice year round. The Santa Monica Mountains and the Channel Islands are different than the mountains to the north because they have granitic and metamorphic basement rocks more like the Sierra Nevada. 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. Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene. The color geologic road maps, based on the 2010 Geologic Map of California, are detailed and easy to read. [PDF] A geologic and hydrologic reconnaissance of Lava Beds National The only significant difference is attributed to the continued maintenance of the McArthur Levee, which has kept these soils drained and suitable for grazing. Oil drilling in the Wilmington field cause up to 30 feet of subsidence at the eastern end of Terminal Island between 1937 and 1958. Hill (1915) published a sketch map of the geology of.the High-grade mining district, a small gold district in the north Warner Mountains. Geothermal systems with evidence of magmatic heat . The highest point on the rim of Medicine Lake volcano'scalderais 2,412 m (7,913 ft). 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. 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. In 1873, 53 Modoc men held off 650 US troops, killing 70 of them in heavy weather in the lava plateau to the south of Tule Lake. From the oldest to the youngest, Georgia's provinces are the Piedmont, Blue Ridge, Valley and Ridge, Appalachian Plateau, and the Coastal Plain. The California Coast Ranges extend from the Oregon line southward 600 miles to the Santa Ynez River. 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. 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. [16]. Borehole Conditions The vault is a horizontal tunnel, located beneath 5 meters of overburden to maintain thermal stability. Polygons from the 1978 State map unit Qp were added where no playa was shown on the county maps. 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. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. The combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. The plateau is cut by many north-south faults. US 97: Weed-Oregon 294. It is lonely country out in the Modoc. Modoc National Forest - Special Places - US Forest Service What is this giant ro. Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . CA 36: Red . Halemaumau, Mauna Loa Gold appears in quartz veins that cut through slate, siltstone and shale originating in the Shasta Bally batholith. Areas along the northeastern shores of Big Lake are mapped as Recent Modoc basalt flows (CDMG, 1968). Andesite and dacite typically have plagioclase, hornblende, and clinopyroxene phenocrysts; some flows aphyric. The Western Paleozoic and Triassic Plate is the most common unit of the Klamath Mountains and is up to 50 miles wide at the Oregon state line. Modoc Plateau and East Cascades - LandScope Its landform is volcanic table land ranging from 4,000 to 6,000 feet above sea level, cut by many northsouth faults. Volcanism continued through the Holocene, forming the 300 foot thick basalts of the Cima Volcanic Field or the Barstow-Amboy axis of volcanic craters, which have protected underlying granite from erosion. The New Almaden mine opened in 1824, ultimately extending 2,450 feet below ground. Mostly nonmarine, but includes marine deposits near the coast. Many of the ash--flow tuffs exhibit flow features and only obscure vitro-clastic textures. 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 latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. 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. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). In Washington and California, less than 2% of the ecoregion had been converted to agricultural or human uses by the early 1990s. 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. A few may date earlier, like the 400 million year old Mule Mountain. 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). Both of these provinces have substantial geothermal resource base and resource potential. The oldest rocks are found in the San Jacinto and Santa Rosa mountains, with schist and gneiss that may be up to 22,000 feet thick. 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. 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. Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. Commonly flow banded; locally glassy. Pyroclastic Rock. Water erosion hazard for bare soil is low to moderate, while the wind erosion hazard is low (refer to TableVI-1). [4] and Modoc Cypress (Cupressus bakeri).[5]. Soils at the property have been mapped as the Pit Silty Clay, Drained, 0 to 2 percent slopes mapping unit. Project work may include post fire recovery efforts. The Modoc Plateau is a volcanic table land approximately 4,000 to 6,000 feet above mean sea level. This region of the mountains was likely underthrusted by the adjoining plates, producing multiple schists around 380 to 400 million years ago in the Ordovician. [12] As indicated by Special Publication 42, Fault-Rupture Zones in California, each of the transfer properties are located in areas with delineated fault-rupture zones. These soils are very deep (greater than 60 inches), very poorly drained, and mucky with slow permeability. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. Gold lodes upstream of the placers were found as well, the largest being French Gulch 15 miles west of Redding. It is composed of layers of volcanic flows and periodic volcanic uplifts. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have had activity within the last 500years (CDMD, 1994). The rocks likely formed much further away from the Sierras and were relocated by the dramatic movements of faults. Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas. All Rights Reserved. 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). Even moderate shaking . Glass in tuff and tuffaceous sedimentary rocks is commonly altered to zeolites, clay minerals, and small amounts of opal, chalcedony, orthoclase, and calcite. Fissure eruptions. The Oldest Rocks: The Piedmont and Blue Ridge [20] 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. 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. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. Contribute to chinapedia/wikipedia.en development by creating an account on GitHub. Occasional lakes, marshes, and sluggishly owing streams meander across the plateau. Geology 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. Franciscan rocks have a complex geological structure. 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 The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). Condado de Modoc, California, Estados Unidos The northeastern-most county in California with a total area of 4,203.37 square miles, but with a population under 10,000. [J Curtis Kramer; Geological Society of Sacramento. 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. Their hazard for water and wind erosion is none to low when bare. Get this from a library! The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert. 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. Therefore, the volcano may be even larger than the estimated 600 km3(143 mi3, already the largest volcano by volume in the Cascade Range. The soils are moderately to strongly alkaline and have a very high shrink-swell potential (refer to TableVI-1). [13]. These basins steadily filled with sediment, with one famous example preserved as the Great Valley beds in the Coast Ranges. It is also known for scores oflava-tubecaves and for well-preserved young volcanic features. [1] It has cinder cones, juniper flats, pine forests, and seasonal lakes. They have a high shrink-swell potential and have a low water erosion hazard and low wind erosion hazard when bare (see TableVI-1). Pahoehoe vs. aa lavas. Colorado Plateau | Natural Atlas Modoc National Forest 800 West 12th Street Alturas, CA 96101 (530) 233-5811 Warner Mountain Ranger District PO Box 220 Cedarville, CA 96104 (530) 279-6116 Camping Warren Peak and Patterson Lake The nearest campground is available at Pepperdine Camp, near the trailhead. Select Mineral List Type Geology. Warner Mountains : Climbing, Hiking & Mountaineering - SummitPost Non-seismic hazards addressed in the document include volcanoes, erosion, and expansive soils. High Cascades and the Modoc Plateau Road Guides 294. In the nineteenth century, mining began in the vicinity of Julian, extracting nickel and gold, in the Julian Schist. Drillhole data indicate that the plateau surface underlying the volcano has been downwarped by 0.5 kilometer under its center. 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 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. As described under item (a), while various areas of the project site do consist of unstable soils, there are no facilities proposed as part of the project which have the potential to be impacted by these soils, therefore this is a less than significant impact. Play-fairway analysis for geothermal resources and - ScienceDirect 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 Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. This added metavolcanic and metasedimentary rocks to the slowly building Sierras. The McArthur Swamp, Bowman Ditch, and the Ahjumawi Property are located within or adjacent to the McArthur Fault-Rupture Zone. Hot springs including San Jacinto, Eden, Saboba and Gilman are active in the San Jacinto Mountains due to the presence of the San Jacinto fault zone and Elsinore was founded on its hot springs. 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). 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. Very hot and fluid, but low in volatile content. Tertiary pyroclastic and volcanic mudflow deposits. They have a moderate to high hazard of erosion by water and a low to moderate erosion hazard from wind in exposed, bare areas (refer to TableVI-1). Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). As a registered user, you can customize maps, save them, and share them with your friends. 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. Modoc National Forest - Rocks & Minerals:Rockhounding Simultaneously island arcs and small sections of continental crust rafted onto the edge of North America, building out the continent. [4]. 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. CWU PANGA - Western US - Station Clusters - Central Washington University They are derived from lake sediments and alluvium, which formed from extrusive igneous rocks. 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. They are shallow, moderately well drained soils with slow permeability and have a high shrink-swell potential (see TableVI-1). It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. [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. 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). Miners extracted placer gold or dug up fossil placers in the Weaverville Formation and Hornbrook Formation. Lithology: Flood basalt(s); mafic volcanic rocks; basalt. 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. Seismic hazards addressed by this element include surface faulting, ground shaking, and ground failure. The Clear Lake National Wildlife Refuge and Long Bell State Game Refuge are located on the plateau as well. Modoc Plateau - Wikipedia Following the exchange, Burney Falls and Bowman Ditch will be protected from major construction and other soil disturbing activities by the legal restrictions applicable to State parklands. . It represents an ancient forearc basin that took shape as oceanic crust subducted under the west edge of the continent. 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. . Surface fault rupture is not necessarily restricted to the area within an Alquist-Priolo Zone. Platy flow-jointing common. AmeriCorps Forestry Technicians will perform a wide variety of activities to support all stages of project work. 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. Geologists debate how high the early Sierra Nevada were. Tertiary volcanic flow rocks; minor pyroclastic deposits. The Bowman Ditch is located on soils mapped as the Pastolla Muck, drained, zero to two percent slopes. PDF East Cascades - Modoc Plateau and West Cascades - Conservation Gateway The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. The plateau is capped with scattered small, young cinder cones and basalt flows. 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. VI. Geology and Soils - California The Coast Range is at even higher risk for damaging landslides than other parts of coastal California due to sheared serpentinite in Franciscan basement rocks. 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. PDF Geology Of The Sierra Nevada California Natural History Guides / Dev 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. Starting on p. 15, this book is divided into seven chapters dealing with the gold-bearing provinces: 1) Sierra Nevada, 2) Klamath Mountains, 3) Basin Ranges, 4) Mojave Desert,S) Transverse and Peninsular Ranges, 6) Modoc Plateau . Funding was provided to WDFW through a state wildlife grant from the United 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. 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.