Anorthosite is a phaneritic, intrusive igneous rock characterized by its composition: mostly plagioclase feldspar (90–100%), with a minimal mafic component (0–10%). Pyroxene, ilmenite, magnetite, and olivine are the mafic minerals most commonly present.
Ultramafic rocks are igneous and meta-igneous rocks with a very low silica content, generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals. The Earth's mantle is composed of ultramafic rocks. Ultrabasic is a more inclusive term that includes igneous rocks with low silica content that may not be extremely enriched in Fe and Mg, such as carbonatites and ultrapotassic igneous rocks.
Serpentine soil is an uncommon soil type produced by weathered ultramafic rock such as peridotite and its metamorphic derivatives such as serpentinite. More precisely, serpentine soil contains minerals of the serpentine subgroup, especially antigorite, lizardite, and chrysotile or white asbestos, all of which are commonly found in ultramafic rocks. The term "serpentine" is commonly used to refer to both the soil type and the mineral group which forms its parent materials.
Mount Sneffels is the highest summit of the Sneffels Range in the Rocky Mountains of North America. The 14,153-foot (4313.93 m) fourteener is located in the Mount Sneffels Wilderness of Uncompahgre National Forest, 6.7 miles (10.8 km) west by south of the City of Ouray in Ouray County, Colorado, United States. The summit of Mount Sneffels is the highest point in Ouray County.
The Acasta Gneiss Complex, also called the Acasta Gneiss, is a body of felsic to ultramafic Archean basement rocks, gneisses, that form the northwestern edge of the Slave Craton in the Northwest Territories, Canada, about 300 km (190 mi) north of Yellowknife, Canada. This geologic complex consists largely of tonalitic and granodioritic gneisses and lesser amounts of mafic and ultramafic gneisses. It underlies and is largely concealed by thin, patchy cover of Quaternary glacial sediments over an area of about 13,000 km2 (5,000 sq mi). The Acasta Gneiss Complex contains fragments of the oldest known crust and record of more than a billion years of magmatism and metamorphism. The Acasta Gneiss Complex is exposed in a set of anticlinoriums within the foreland fold and thrust belt of the Paleoproterozoic Wopmay Orogen.
Hatcher Pass is a mountain pass through the southwest part of the Talkeetna Mountains, Alaska. It is named after Robert Hatcher, a prospector and miner. The nearest cities are Palmer and Wasilla approximately 12 miles (19 km) to the south, and Willow approximately 26 mi (42 km) to the west. The communities are at an elevation of approximately 250 ft (76 m) in the Mat-Su valley.
The Great Dyke or Dike is a linear geological feature that trends nearly north-south through the centre of Zimbabwe passing just to the west of the capital, Harare. It consists of a band of short, narrow ridges and hills spanning for approximately 550 kilometres (340 mi). The hills become taller as the range goes north, and reach up to 460 metres (1,510 ft) above the Mvurwi Range. The range is host to vast ore deposits, including gold, silver, chromium, platinum, nickel and asbestos.
The Ogeechee River is a 294-mile-long (473 km) blackwater river in the U.S. state of Georgia. It heads at the confluence of its North and South Forks, about 2.5 miles (4.0 km) south-southwest of Crawfordville and flowing generally southeast to Ossabaw Sound about 16 miles (26 km) south of Savannah. Its largest tributary is the Canoochee River, which drains approximately 1,400 square miles (3,600 km2) and is the only other major river in the basin. The Ogeechee has a watershed of 5,540 square miles (14,300 km2). It is one of the state's few free-flowing streams.
The Musgrave Block is an east-west trending belt of Proterozoic granulite-gneiss basement rocks approximately 500 kilometres (310 mi) long. The Musgrave Block extends from western South Australia into Western Australia.
Barren vegetation describes an area of land where plant growth may be sparse, stunted, and/or contain limited biodiversity. Environmental conditions such as toxic or infertile soil, high winds, coastal salt-spray, and climatic conditions are often key factors in poor plant growth and development. Barren vegetation can be categorized depending on the climate, geology, and geographic location of a specific area.
Potosi Mountain is approximately 30 miles (50 km) southwest of Las Vegas in the Spring Mountains of Clark County, southern Nevada, United States. It is also called Double Up Mountain and Olcott Peak. Its main bedrock is limestone.
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1,200 °C. The volcanic rock resulting from subsequent cooling is often also called lava.
Haw River Valley is an American Viticultural Area (AVA) officially becoming the 3rd appellation in North Carolina, United States, after the establishments of Yadkin Valley and Swan Creek viticultural areas within the Yadkin Valley region. The area was recognized on April 29, 2009 by the Alcohol and Tobacco Tax and Trade Bureau (TTB), Treasury after reviewing the petition submitted by Patricia McRitchie of McRitchie Associates, LLC, on behalf of its local grape growers and winemakers. Haw River Valley viticultural area covers the northern, central portion of the state encompassing 868 square miles centered around the city of Burlington and bisected by the Haw River. The appellation expands across all or portions of Alamance, Caswell, Chatham, Guilford, Orange, and Rockingham Counties being accessible between the state's largest metropolitan areas of Greensboro to the west, and Durham-Raleigh to the east on Interstate 40.
The geology of Montana includes thick sequences of Paleozoic, Mesozoic and Cenozoic sedimentary rocks overlying ancient Archean and Proterozoic crystalline basement rock. Eastern Montana has considerable oil and gas resources, while the uplifted Rocky Mountains in the west, which resulted from the Laramide orogeny and other tectonic events have locations with metal ore.
The geology of North Carolina includes ancient Proterozoic rocks belonging to the Grenville Province in the Blue Ridge. The region experienced igneous activity and the addition of new terranes and orogeny mountain building events throughout the Paleozoic, followed by the rifting of the Atlantic Ocean and the deposition of thick sediments in the Coastal Plain and offshore waters.
Sugarloaf Mountain is an unusual hill located in Patrick, South Carolina. Known locally as "The Mountain", it towers 100 feet above the surrounding terrain. This site is located within the Sand Hills State Forest, adjacent to U.S. Highway 1, in the Carolina Sandhills region of the Atlantic Coastal Plain.
Henry Gardiner Ferguson was an American geologist with the United States Geological Survey (USGS). He worked primarily in Nevada and was a pioneer in the geology of the central Great Basin, producing many publications, including multiple USGS geological maps of central Nevada. Ferguson was a lifelong friend and colleague of Levi Noble, a mentor to Ralph Roberts, and worked extensively with Siemon Muller. Along with his wife Alice Ferguson, he helped found the Moyaone Reserve community in Accokeek, Maryland.
The Ammonoosuc Volcanics is a rock unit in parts of New Hampshire and Vermont in the United States. This unit is named for the Ammonoosuc River that runs through the portion of New Hampshire that houses the Ammonoosuc Volcanics.
Located in the Charlotte Belt of North Carolina is the Farmington Gabbro, located in the Mocksville Complex. The Mocksville Complex consist of metamorphosed/unmetamorphosed gabbros, pyroxenites, hornblendites, wehrlites, granites, and diorites. The plutons in this region formed during the Taconic, Acadian, and Alleghanian orogeny starting on the eastern side of Laurentia. These plutons date back to around 400 Ma, consisting of ultramafic, mafic, and felsic rocks but the Farmington Gabbro is the only pluton on the northwest side of the complex that is unmetamorphosed.
The Ord Mountains are a small range six miles south of the Apple Valley post office, and five miles southeast of the Hesperia post office. They are about 6.4 miles long, about three miles wide at the south end, and less than 1.5 miles wide in the north.
