This 6"x9" paperback has 371 pages that are packed with detailed information about California Geology. They have a Capability Class rating of IV and are not considered to be Prime Farmland (NRCS, 2000). 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. [20] Several Quaternary and Holocene faults are located within a 60-mile radius of the site. Identify Priority Places: A Practitioner's Guide, Cumberlands and Southern Ridge and Valley, Willamette Valley-Puget Trough-Georgia Basin. Shield volcanos. Qya-Younger alluvium: Map unit is used in Churchill, Elko, Esmeralda, Eureka, Humboldt, Lander, and Lincoln Counties where geologic information suggests better-defined younger versus older alluvium. Some soils are found in each property while others are more or less restricted to one portion of the property. As discussed under the Bowman Ditch subheading, numerous faults are located in the immediate vicinity of the McArthur Swamp. The Modoc exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). Policy SG-d - Shasta County shall develop and maintain standards for erosion and sediment control plans for development. doi: 10.4095/223767. Shasta, Lassen Peak, or Medicine Lake volcanic centers, all of which have experienced activity within the last 500 years (CDMG, 1994). They have a Capability Class rating of II and are classified as Prime Farmland when properly drained and irrigated (NRCS, 2000). [J Curtis Kramer; Geological Society of Sacramento. Levee improvements and associated road maintenance necessary for delivery of imported fill would also cause temporary disturbances to the topsoil surfaces. Furthermore, each of the properties would be subject to regional volcanic events originating from the previously discussed volcanoes. NGMDB Product Description Page [12] PDF California Geomorphic Provinces - csun.edu The actual distribution of these ten mapping units is complex, and therefore, will be described by bisecting the site into two northern quadrants and a southern half. Furthermore, the McArthur Fault bisects the property and is designated as an Alquist-Priolo Fault-Rupture Study Zone. The Modoc National Forest has four obsidian mines in the Warner Mountains near Davis Creek, Calif. on the east side of the forest where it is legal to collect obsidian with a free permit available from the Forest Supervisor's office in Alturas. The soils have a Capability Class rating of IV and are not considered Prime Farmland. Includes some Mesozoic rocks. Includes Picture Rock Basalt of Hampton (1964), radiometrically dated by potassium-argon methods as middle(?) During the Nevadan orogeny in the Jurassic, extensive folding and faulting altered the rocks and huge granite batholiths erupted. The mountains are drained by the Russian, Eel, Mad and Klamath rivers which tend to follow faults and folds. Dugan and Graven soils are comprised of soils formed on mounds and stream terraces from alluvium of extrusive igneous rocks. The Burney Falls properties are located to the northwest of the Rocky Ledge Fault-Rupture Zone. 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. Geology - 156 pages. Movement along the Sierra Nevada fault helped to create the new Muir Crest and parts of the mountain range rose up to 10,000 feet over the last three million years, creating a steep face to the west of Owens Valley. Young Volcanoes: the Cascades and Modoc Plateau A few may date earlier, like the 400 million year old Mule Mountain. 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. Roadside Geology of Northern and Central California|Paperback 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). Pyroclastic Rock. 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. The rugged terrain of the Modoc Plateau played an important role in the Modoc War. Soils of the Pittville Sandy Loam, 0 to 5 percent slopes mapping unit occur at the southern fringe of the site. They have a moderate hazard for water and wind erosion when bare. Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. 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 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. They have a low hazard of erosion by water and a moderate erosion hazard from wind in exposed, bare areas. California's Amazing Geology - Donald R. Prothero - 9781498707954 Virtually all of the islands in the bay are man-made from dredged sediments. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. [13]. There are also several herds of wild horses on the plateau. As discussed in Section1.0, Project Description, no development is proposed that would eventually be utilized for human occupancy. Geologic Guide to the Modoc Plateau and the Warner Mountains: Annual Field Trip Guidebook of the Geological Society of . Shelf and slope deposits would ultimately become Great Valley rocks, while the trench deposits became the Franciscan subduction complex. Substantially folding at the edge of the valley creates famous oil producing dome structures like Lost Hills and Kettleman Hills. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. Additionally, the banks of the levees could experience localized landslides and slumps. These soils have a Capability Class rating of III to IV and are considered Prime Farmland when irrigated (NRCS, 2000). 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. Special attention shall be provided to erosion prone hillside areas, including extremely erodible soils types such as those evolved from decomposed granite. Mineral materials found on the forest include obsidian and obsidian needles, petrified wood and assorted gemstones. 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. Roadside Geology of Northern and Central California, "Second Edition", 2016, Alt/Hyndman Roadside Geology of Oregon, "Second Edition", 2016, Marli B. Miller 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. Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . The river drains a 612-square mile area, but due to the porous volcanic nature of the region, most of the stream flow originates from springs within the valley. Flows like water in many cases. Large mammals are emblematic of the ecoregion, which supports populations of elk, blacktail deer, mule deer, bighorn sheep, mountain lions, and black bears. California s geology makes headlines when faults shift, volcanoes puff steam, and coastal bluffs fall into the sea. The Upper Klamath Basin and the Modoc Plateau are large land forms that characterize the southern portion of the ecoregion. Tribes are active participants in discussions about natural resources management and conservation activities within their usual and accustomed areas. However, the Greenhorn Fault system is more active to the south, extending to the Tehachapi Mountains and causing more plateau-like landforms. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. Warner Mountains : Climbing, Hiking & Mountaineering - SummitPost CEA - California Earthquake Risk Map & Faults By - Earthquake Authority Eruptions relatively quiet, but spectacular. 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. These are Jurassic and Cretaceous age greywacke, chert, basalt, ultrabasic rocks and serpentinite from modified oceanic crust. 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. Basalt flows, flow breccia, and basaltic peperite; minor andesite flows; some interbeds of tuff and tuffaceous sedimentary rocks. 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. In addition, the McArthur Swamp area could be affected by regional volcanic events originating within the Mt. Golden eagles (Aquila chrysaetos) inhabit a small portion of their historical ranges and are limited in distribution while the peregrine falcon (Falco peregrinus) is making a comeback. 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. 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. Significant regions of this sparsely populated county include the Modoc Plateau, Great Basin, Cascade Range and Warner Mountains. 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. 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. This property could potentially be subjected to ground motion from displacement along any of these local and regional faults. 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. 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). 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. The monument, established in 1925, includes the sites of many important battles of the Modoc Indian War of 1872-73. They have a Capability Class rating of IV and are considered Prime Farmland if drained and irrigated (NRCS, 2000). Therefore, aside from naturally occurring erosional processes, no impact is anticipated. In the early Cenozoic, widespread erosion of crystalline rocks inland produced huge quantities of sediment which deposited on the Cretaceous rocks of the Peninsular Ranges. The soil lacks a substantial proportion of clay and therefore, has a low shrink-swell potential (refer to TableVI-1). The Rocky Ledge fault trends northwesterly about three miles to the south of the transfer property (CDMG, 1994). They have a low hazard from water and wind erosion when exposed. Potassium-argon ages on rocks from unit range from about 36 Ma (Swanson and Robinson, 1968) to about 20 Ma. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas. In the nineteenth century, mining began in the vicinity of Julian, extracting nickel and gold, in the Julian Schist. Miners extracted placer gold or dug up fossil placers in the Weaverville Formation and Hornbrook Formation. 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). The Modoc Plateau has both active volcanoes and faults. This Reference Books item is sold by MyHometownVintage. The ditch was originally channeled out to increase flows to the Tule River for the Pit River Hydroelectric Project. Get this from a library! Appendix MP. The Modoc Plateau Region - UC Santa Barbara As a registered user, you can customize maps, save them, and share them with your friends. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. PDF Modesto Junior College Course Outline of Record Report 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. For much of the Cenozoic the region was filled with lakes and brackish swamps. Flow in and out of the estuary has been controlled with a man-made structure since heavy silting in 1915. Policy SG-e - When soil tests reveal the presence of expansive soils, engineering design measures designed to eliminate or mitigate their impacts shall be employed. 896, p. 1018-1019). Geology and History | U.S. Geological Survey Unconsolidated to semiconsolidated lacustrine clay, silt, sand, and gravel; in places includes mudflow and fluvial deposits and discontinuous layers of peat. The County Environmental Health Department would act as the monitoring body to ensure compliance with the permit. Select Mineral List Type Basalt is aphyric to moderately porphyritic with phenocrysts of plagioclase and olivine and exhibits both subophitic and diktytaxitic textures. Abstract. [8], The Modoc Plateau is an undulating expanse of Miocene to Holocene basalt law flows at the southwest edge of the Columbia Plateau, covering 10,000 square miles. A thick sequence of mostly terrestrial sedimentary rocks including the Rosario, Ladd, Trabuco and Williams formations is exposed on the western slope of the Santa Ana Mountains and Santa Ana Canyon, stretching southward to Camp Pendleton, San Onofre, and smaller exposures in Encinitas, Leucadia, Point Loma and La Jolla. Most precipitation accumulates from November through April. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 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. In addition, the Bowman Ditch and surrounding area are located within an area that could be affected by regional volcanic events originating within the Mt. 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. 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. Use the interactive map to zoom smoothly from a national view to state and local perspectives anywhere across the country. Comments: Columbia Plateau. Unlike most of California, the Mojave region has numerous Precambrian Proterozoic rocks, such as granitic gneiss or marble intruded with porphyry in the Ord Mountains or schist in the Old Woman Mountains. . A thrust fault, known as the Trinity or Bully Choop thrust, separates the Eastern Klamath Plate from the Central Metamorphic Plate. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. Modoc National Forest - Special Places - US Forest Service