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Ahtanum Ridge
Ahtanum Ridge is a long anticline mountain ridge in Yakima County, Washington, Yakima County in the U.S. state of Washington (state), Washington. It is located just south of the city of Yakima, Washington, Yakima, and much of its length is at the northern edge of the Yakama Indian Reservation. Its name comes from the Sahaptin toponym [átanɨm]. Ahtanum Ridge is part of the Yakima Fold Belt of east-tending long ridges formed by the folding of Miocene Columbia River Basalt Group, Columbia River basalt flows. , USGS Earthquake Hazards Program Ahtanum Ridge separates Yakima River, Yakima Valley on the south from Ahtanum Valley on the north. At the eastern end of Ahtanum Ridge the Yakima River flows through Unio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene followed the Oligocene and preceded the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by distinct global events but by regionally defined transitions from the warmer Oligocene to the cooler Pliocene Epoch. During the Early Miocene, Afro-Arabia collided with Eurasia, severing the connection between the Mediterranean and Indian Oceans, and allowing the interchange of fauna between Eurasia and Africa, including the dispersal of proboscideans and Ape, hominoids into Eurasia. During the late Miocene, the conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ridges Of Washington (state)
A ridge is a long, narrow, elevated geomorphology, geomorphologic landform, Structural geology, structural feature, or a combination of both separated from the surrounding terrain by steep sides. The sides of a ridge slope away from a narrow top, the crest or ridgecrest, with the terrain dropping down on either side. The crest, if narrow, is also called a ridgeline. Limitations on the dimensions of a ridge are lacking. Its height above the surrounding terrain can vary from less than a meter to hundreds of meters. A ridge can be either Deposition (geology), depositional, erosional, Tectonics, tectonic, or a combination of these in origin and can consist of either bedrock, loose sediment, lava, or ice depending on its origin. A ridge can occur as either an isolated, independent feature or part of a larger geomorphological and/or structural feature. Frequently, a ridge can be further subdivided into smaller geomorphic or structural elements. Classification As in the case of la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rattlesnake Hills
The Rattlesnake Hills, also known as Rattlesnake Ridge, is a 16-mile (26 km) long anticline mountain ridge in Yakima County, Washington, Yakima County and Benton County, Washington, Benton County in the U.S. state of Washington (state), Washington. It should not be confused with the much smaller Rattlesnake Ridge located near the west end of Ahtanum Ridge just south of Yakima, Washington and west of Union Gap, Washington. The highest point in the hills (as well as Benton County, Washington, Benton County) is the Lookout Summit, which surpasses the more well-known Rattlesnake Mountain (Benton County, Washington), Rattlesnake Mountain by approximately . The Rattlesnake Hills are part of the Yakima Fold Belt of east-tending long ridges formed by the folding of Miocene Columbia River Basalt Group, Columbia River basalt flows. The Rattlesnake Hills form the northern edge of the Yakima River, Yakima Valley, running from the vicinity of Benton City, Washington, Benton City to just ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Gap, Washington
Union Gap is a city in Yakima County, Washington, United States. The population was 6,568 at the 2020 census. Union Gap has become the retail hub for the entire Yakima Valley as a result of Valley Mall and other thriving businesses being located here. Part of the city is within the Yakama Nation. Name The town is named for a water gap formed by the Yakima River between the Rattlesnake Hills and Ahtanum Ridge. The gap is traversed by U.S. Route 97, Interstate 82, and Thorp Road, and the BNSF Railway. History The city of Union Gap was originally named Yakima City and was officially incorporated on November 23, 1883. When bypassed by the Northern Pacific Railroad in December 1884, over 100 buildings were moved with rollers and horse teams to the nearby site of the depot. The new city was dubbed North Yakima. In 1918, North Yakima was renamed to simply Yakima, and the original town to the south was named Union Gap to avoid confusion between the two towns. Geography According ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ahtanum Valley
There are two things named Ahtanum in the U.S. state of Washington: *Ahtanum, Washington Ahtanum () is a census-designated place (CDP) in Yakima County, Washington. The population was 4,046 at the time of the 2020 census. Geography According to the United States Census Bureau, the CDP has a total area of 9.7 square miles (25.1& ... (town) * Ahtanum View Correction Center (state prison) {{Disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakima River
The Yakima River is a tributary of the Columbia River in south central and eastern Washington state, named for the indigenous Yakama people. Lewis and Clark mention in their journals that the Chin-nâm pam (or the Lower Snake River Chamnapam Nation) called the river ''Tâpe têtt'' (also rendered ''Tapteete''), possibly from the French ''tape-tête'', meaning "head hit". The length of the river from headwaters to mouth is , with an average drop of . It is the longest river entirely in Washington state. Course The river rises in the Cascade Range at an elevation of at Keechelus Dam on Keechelus Lake near Snoqualmie Pass, near Easton. The river flows through that town, skirts Ellensburg, passes the city of Yakima, and continues southeast to Richland, where it flows into the Columbia River creating the Yakima River Delta at an elevation of . About 9 million years ago, the Yakima River flowed south from near Vantage to the Tri-Cities, and then turned west straight fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbia River Basalt Group
The Columbia River Basalt Group (CRBG) is the youngest, smallest and one of the best-preserved continental flood basalt provinces on Earth, covering over mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. The basalt group includes the Steens and Picture Gorge basalt formations. Introduction During the middle to late Miocene epoch, the Columbia River flood basalts engulfed about of the Pacific Northwest, forming a large igneous province with an estimated volume of . Eruptions were most vigorous 17–14 million years ago, when over 99 percent of the basalt was released. Less extensive eruptions continued 14–6 million years ago. Erosion resulting from the Missoula Floods has extensively exposed these lava flows, laying bare many layers of the basalt flows at Wallula Gap, the lower Palouse River, the Columbia River Gorge and throughout the Channeled Scablands. The Columbia River Basalt Group is thought to be a potential link ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakima Fold Belt
The Yakima Fold Belt of south-central Washington, also called the Yakima fold-and-thrust belt, is an area of topographical folds (or wrinkles) raised by tectonic compression. It is a structural-tectonic sub province of the western Columbia Plateau Province resulting from complex and poorly understood regional tectonics. The folds are associated with geological faults whose seismic risk is of particular concern to the nuclear facilities at the Hanford Nuclear Reservation (immediately northwest of the Tri-Cities) and major dams on the Columbia and Snake Rivers. Location and extent Image:Yakima Fold Belt map.jpg, upright=1.34, Shaded-relief map showing ridges of the Yakima Fold Belt of south-central Washington, mostly between Interstate 90 (red line) and the Columbia River (bottom). Red square in center is the city of Yakima, red rectangle at lower right is the Tri-Cities, red circles are various cities, triangles are the Mount Rainier, Mount St. Helens, and Mount Adams volcan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anticline
In structural geology, an anticline is a type of Fold (geology), fold that is an arch-like shape and has its oldest Bed (geology), beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex curve, convex up in which the hinge or crest is the location where the curvature is greatest, and the limbs are the sides of the fold that Strike and dip, dip away from the hinge. Anticlines can be recognized and differentiated from antiforms by a sequence of rock layers that become progressively older toward the center of the fold. Therefore, if age relationships between various Stratum, rock strata are unknown, the term antiform should be used. The progressing age of the rock strata towards the core and uplifted center, are the trademark indications for evidence of anticlines on a geological map. These formations occur because anticlinal ridges typically develop above thrust faults during crustal deformations. The uplifted core of the fold cau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sahaptin
The Sahaptin are a number of Native American tribes who speak dialects of the Sahaptin language. The Sahaptin tribes inhabited territory along the Columbia River and its tributaries in the Pacific Northwest region of the United States. Sahaptin-speaking peoples included the Klickitat, Kittitas, Yakama, Wanapum, Palus, Lower Snake, Skinpah, Walla Walla, Umatilla, Tenino, and Nez Perce. Territory According to early written accounts, Sahaptin-speaking peoples inhabited the southern portion of the Columbia Basin in Washington and Oregon. Villages were concentrated along the Columbia River, from the Cascades Rapids to near Vantage, Washington, and along the Snake River from the mouth to close to the Idaho border. The closely related Nez Perce tribe lived to the east. There were additional villages along tributaries, including the Yakima, Deschutes, and Walla Walla rivers. Several villages were located west of the Cascade mountains in southern Washington, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yakama Indian Reservation
The Yakama Indian Reservation (spelled Yakima until 1994) is a Native American reservation in Washington state of the federally recognized tribe known as the Confederated Tribes and Bands of the Yakama Nation. The tribe is made up of Klikitat, Palus, Wallawalla, Wenatchi, Wishram, and Yakama peoples. Geography The reservation is located on the east side of the Cascade Mountains in southern Washington state. The eastern portion of Mount Adams lies within this territory. According to the United States Census Bureau, the reservation covers 2,185.94 square miles (5,661.56 km²) and the population in 2000 was 31,799. It lies primarily in Yakima and the northern edge of Klickitat counties. The largest city on the reservation is Toppenish. About 80% of the reservation's land is held in trust by the federal government for the benefit of the tribe and tribal members.Mark T. BakerThe Hollow Promise of Tribal Power to Control the Flow of Alcohol into Indian Country 88 V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
