Locally a late Hemingfordian age indicated by mammalian fauna (Woodburn and Robinson, 1977). [12] Based on the presence of flat-topped guyot undersea volcanoes with geology similar to the bedded cherts and pillow lavas of the The principal geologic units in the vicinity are volcanic rocks,, which in places are highly permeable, and poorly permeable lake sedimentary deposits, all probably post-Oligocene in age. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps. The Franciscan subduction complex makes up the basement rock for part of the range, with a mlange dominated by graywacke first deposited in offshore deep ocean basins. They are shallow, well drained cobbly loams of moderate permeability and are neutral to mildly acidic. "Occasioned lakes, marshes, and sluggishly flowing streams meander across the plateau. As with the State Park, several Quaternary and Holocene faults are located within a 60-mile radius of the drainage way. The Marble Mountain Cambrian quartzite lies unconformably atop Proterozoic granites. Glass in tuff and tuffaceous sedimentary rocks is commonly altered to zeolites, clay minerals, and small amounts of opal, chalcedony, orthoclase, and calcite. 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. Whitebark pine (Pinus albicaulis), lodgepole pine, and western larch (Larix occidentalis) are common components of many of these forests. 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. Most intrusive igneous rocks are tonalite, granodiorite, quartz diorite or gabbro. Surface fault rupture is not necessarily restricted to the area within an Alquist-Priolo Zone. 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. Lake beds interbedded with volcanic ash are typical of the Cenozoic. 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. Therefore, a less-than-significant impact is expected. 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). In addition to the web viewer, the GIS data can be downloaded for further use. Geothermal systems with evidence of magmatic heat, associated wi The soils are very deep, well drained soils with moderately slow permeability and have a moderate shrink-swell potential (see Table VI-1). Before the end of the Oligocene, sea levels rose again leaving behind the Vaqueros Formation and then the Miocene deep water silt and clay of the Rincon Formation. 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. The subsurface is well known from oil wells and oil fields are bounded in the east by the Kern Front fault. 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. Modoc Plateau. There are also several herds of wild horses on the plateau. These flyers, referred to as Geo Gems Notes, address individual parks and describe the geological features they support, explain the geological processes demonstrated by the landforms at the site and their significance, and indicate where to find the sites in each park unit. 27 Permit, which requires agreement with the USFWS and a water certification or waiver. It is drained by the Pit River, which ultimately reaches Shasta Lake and the Sacramento River. The western pond turtle is listed as an endangered species in Washington, although it has more robust populations in the Oregon and California portions of its range. 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. Study with Quizlet and memorize flashcards containing terms like 11, Cascade Range, Great Valley, Transverse Range, Peninsular Range, Colorado Desert, Coast Ranges, Sierra Nevadas, Mojave Desert, Modoc Plateau, Klamath Mountains, Basin and Range, Mount Whitney, Sierra Nevadas and more. The Clear Lake National Wildlife Refuge and Long Bell State Game Refuge are located on the plateau as well. Isolated volcanic cones occupy steep mountain ridges, but tend to be smaller than those in the Western Cascades with the exception of Mount Adams. 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 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). Typical rock formations in the area include volcanic breccia, mud and ash flows, lava flows, lacustrine (lake) deposits, and cinder cone pyroclastic rocks. During the Jurassic, many sediments shed into the region from the rising proto-Sierra Nevada. . 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. In the 1960's, NASA astronauts trained for future moon landings in the pumice fields of the highlands. 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. [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. 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. Furthermore, the McArthur Fault bisects the property and is designated as an Alquist-Priolo Fault-Rupture Study Zone. Get this from a library! Volcanic rocks erupted around Barstow in the Triassic. 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. 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. They are associated with the Whipp-Cupvar Complex, slightly saline, 0 to 2percent slopes mapping unit which occupies a flanking position to the south. The plateaus block faulting is believed to be related to Basin and Range faulting in a terrain immersed by volcanic rocks (CDMG, 1966). Older alluvium, lake, playa, and terrace deposits. The Modoc Plateau lies in the northeast corner of California as well as parts of Oregon and Nevada. [10], At the edge of the Los Angeles coastal plain and just west of the San Joaquin Hills, Newport Bay is a major hub of boating. Recent lava flows comprise approximately 60 percent of this complex and are characterized by sharp, jagged, broken blocks piled in tumbled heaps and have many crevices, sinkholes, and collapsed lava tubes. Therefore, the transfer would not expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death. Also includes minor rhyolite and dacite flows and domes. The Stockton fault and White Wolf fault by Bakersfield are both major tectonic features. MOD - Modoc Plateau, CA, USA. Hill*s work, however, is of little value in understanding the areal . New Idria, New Almaden and mines in the Mayacmas Mountains have been the main sources throughout history. Nearly 1,000,000 acres (400,000 ha) 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 mountains are drained by the Santa Margarita, San Luis Rey, San Diego and San Dieguito rivers, while San Felipe Creek in the east drains into the Salton Sea. 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. 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. [18]. The California Coast Ranges extend from the Oregon line southward 600 miles to the Santa Ynez River. During the Jurassic high sea levels retreated, switching to the deposition of the terrestrial Aztec sandstone. [19]. Gassaway soils have a Capability Class rating of VIII and are not considered Prime Farmland. Better run fast! For your next road trip, replace your tattered, dog-eared copy of the old edition with this gorgeous new volume. This area lies along the northwestern-most flank of the Sierra Nevada Geomorphic Province. Age, mostly Oligocene; may include some rocks of early Miocene age. These deposited as part of a series of small island arcs, "rafted" against the coast of the proto-North American continent Laurentia. 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. [2] The plateau is thought to have been formed approximately 25 million years ago as a southern extension of the Columbia Plateau flood basalts. The soils have a Capability Class rating of IV and are not considered Prime Farmland. Yields and specific capacities of -wells in the unconfined water body within volcanic rocks and lake deposits range widely . May include some rocks of middle Miocene age in the area west and northwest of Lakeview. 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. The latest edition of this popular book explores the state s recent rumblings and tremulous past with the aid of full color illustrations. Therefore, the volcano may be even larger than the estimated 600 km3(143 mi3, already the largest volcano by volume in the Cascade Range. 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. Compared with the Sierra Nevada, rocks from this time period tend be more calcic than silicic. Elevations vary from 650 to 1300 feet and the bedrock consists of sandstone, siltstone, shale, some limestone and coal. The combination of these processes and volcanic activity created rugged ridges extending southeast to east from the Cascade crest. 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. Broad valleys occupy the lowlands between the mountain ridges. Roadside Geology of Northern and Central California - David D. Alt 2016 Sierra Nevada -- Klamath mountains -- Coast range -- The great valley -- High Cascades on the Modoc plateau -- Basin and range. Water erosion hazard for bare soil is low to moderate, while the wind erosion hazard is low (refer to TableVI-1). These soils formed in basins from fine-textured alluvium from extrusive and basic igneous rock. Oil drilling in the Wilmington field cause up to 30 feet of subsidence at the eastern end of Terminal Island between 1937 and 1958. Pillow structures from rapid cooling water indicate underwater volcanism that produced basalt, andesite and diabase flows during the Miocene. The thick Galice formation slate and metamorphosed greywacke overlie the Josephine ophiolite and likely deposited in a deep ocean environment offshore of the island arc. 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. 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. The Modoc exploited collapse pits and lava tunnels, turning to Tule Lake for food (subsequent drainage has reduced the lake shoreline). During the Nevadan orogeny in the Jurassic, extensive folding and faulting altered the rocks and huge granite batholiths erupted. Sandstone, shale, and conglomerate; in part Miocene and Eocene. 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. This produced major crustal stretching, volcanism and displacement of up to 125 miles. California has some of the most distinctive and unique geology in the United States. Most of the gold deposits date to the Cretaceous and formed in narrow belt around the Melones fault in quartz veins. Rhyolite volcanic ash buried other streams during the Oligocene forming tuff that early miners need to dig through to get at placer gold, and many old buildings in the region are made of blocks of tuff. LavaBeds National Monument encompasses about 188 km2(73 mi2) on the northern flank of Medicine Lake volcano and displays mostlybasalticand someandesiticlavas. The Lava Flows-Gassaway Complex, 2 to 15 percent slopes map unit is found along the northeastern shoreline of Big Lake at the northeastern edge of the site. In some areas, decades of fire suppression have resulted in large areas of dense, fire-prone forest. 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. SP026: Traveling America's loneliest road: A geologic and natural history tour through The soils are moderately to strongly alkaline. These soils are moderately deep, moderately well drained and have slow permeability. 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. 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. 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! California has 435 recognized alliances and within those more than 1,200 vegetation associations exist. 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. The Fall River Watershed lies within the volcanic terrain of the Modoc Plateau geomorphic province, and is the largest sub-drainage in the middle reach of the Pit River. 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.
modoc plateau geology
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