ⓘ Free online encyclopedia. Did you know? page 122

Inverclyde Group

The Inverclyde Group is a Carboniferous lithostratigraphic group in southern Scotland and northernmost England. The name is derived from Inverclyde. The rocks of the Inverclyde Group have also previously been referred to as the Cementstone Group ...

Kendal Group

The Kendal Group is a Silurian lithostratigraphic group in the southern Lake District and the Howgill Fells of northern England. The name is derived from the town of Kendal in Cumbria. The Group is included within the Windermere Supergroup. The g ...

Lower Estuarine Series

The Lower Estuarine Series, also called in more modern publications, the Grantham Formation, is a relatively complex but generally thin set of geological strata which are usually considered as a group. It forms a lower part of the Inferior Oolite ...

Lower Greensand Group

The Lower Greensand Group is a geological unit, which forms part of the underlying geological structure of southeast England. South of London in the counties of West Sussex, East Sussex, Surrey and Kent, which together form the wider Weald, the L ...

Mawddach Group

The Mawddach Group is a middle to upper Cambrian lithostratigraphic group in Gwynedd, Wales. The name is derived from the river known as the Afon Mawddach.

Menevian Group

The Menevian Group is a Cambrian lithostratigraphic group in west Wales. The name is derived from Menevia, the Roman name for the St Davids area north of St Brides Bay on Pembrokeshire’s west coast where the strata are well exposed in coastal cli ...

Pebidian Supergroup

The Pebidian Supergroup is an Ediacaran lithostratigraphic supergroup in Pembrokeshire, west Wales. The term Pebidian was coined by geologist Henry Hicks in 1876 and published in a scientific paper in the Quarterly Journal of the Geological Socie ...

Reston Group

The Reston Group is a Silurian to Devonian lithostratigraphic group in the Southern Uplands terrane of southern Scotland and northernmost England. The name is derived from Reston in the Scottish Borders. The rocks of the Reston Group have also pr ...

Riccarton Group

The Riccarton Group is a Silurian lithostratigraphic group in southern Scotland and northern England. The name is derived from Riccarton in the Edinburgh area. The rocks of the Riccarton Group have also previously been known as the Riccarton Form ...

Solva Group

The Solva Group is a Cambrian lithostratigraphic group in west Wales. The name is derived from Solva on the west coast of Pembrokeshire where the strata are well exposed in coastal cliffs. This rock succession was formerly known as the Solva Seri ...

Stockdale Group

The Stockdale Group is a Silurian lithostratigraphic group in the southern Lake District and Howgill Fells of the Pennines of northern England. The name is derived from the locality of Stockdale near the top of Longsleddale in Cumbria. It is incl ...

Stratheden Group

The Stratheden Group is a Devonian lithostratigraphic group in southern Scotland and northernmost England. Occasionally pebbly, this red-brown and yellow sandstone dominated unit also contains siltstones and mudstones. It is encountered in Arran ...

Strathmore Group

The Strathmore Group is a Devonian lithostratigraphic group in central Scotland. Its sandstones are interbedded with siltstones which interfinger with conglomerates. It is encountered from Arran in the west across the Midland Valley to Stonehaven ...

Tranearth Group

The Tranearth Group is a Silurian lithostratigraphic group in the southern Lake District and Howgill Fells of the Pennines of northern England. The name is derived from the locality of Tranearth near Torver in Cumbria. The Group is included withi ...

Woburn Sands Formation

The Woburn Sands Formation is a geological formation in England. Part of the Lower Greensand Group, it is the only unit of the group where it occurs, and thus is sometimes simply referred to as the Lower Greensand in these areas. It was deposited ...

Beaverdam Formation (Delmarva)

The Beaverdam Formation is an upper Pliocene geologic formation on the Delmarva Peninsula in southern Delaware and eastern Maryland. It is the largest major surficial layer on the Delmarva Peninsula and has a lower stream-deposited unit and an up ...

Boquillas Formation

The Boquillas Formation is a geologic formation deposited during the Late Cretaceous in modern-day West Texas. It is typically composed of alternating marls and limestones with thin volcanic ash beds. It was named for outcrops near the former Boq ...

Castlegate Sandstone

The Castlegate Sandstone is a Mesozoic geologic formation in the United States. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

Cokedale Formation

The Cokedale Formation is a Mesozoic geologic formation in the United States. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

Collinsville Formation

Collinsville Formation is a geologic formation in the U.S. state of Connecticut. It is the formation of metamorphic rocks from the middle Ordovician era. U.S. geological survey description includes that it is "the most complete sequence in the Sh ...

Hosselkus Limestone

The Hosselkus Limestone is an Upper Triassic fossiliferous marine micritic limestone formation that outcrops in Plumas and Shasta Counties, California. It is known for its invertebrate fauna, most notably the many species of shelled cephalopods.

Javelina Formation

The Javelina Formation is a geological formation in Texas. Dating has shown that the strata date to the Maastrichtian stage of the Late Cretaceous, approximately 70 to 66.5 million years old. The middle part of the formation has been dated to abo ...

Jordan Formation

The Jordan Formation is a siliciclastic sedimentary rock unit identified in Illinois, Michigan, Wisconsin, Minnesota, and Iowa. Named for distinctive outcrops in the Minnesota River Valley near the town of Jordan, it extends throughout the Iowa S ...

Lake Waco Formation

The Lake Waco Formation is a geologic formation within the Eagle Ford Group deposited during the Middle Cenomanian to the Early Turonian of the Late Cretaceous in central Texas. The formation was named for outcrops near Lake Waco, south of the ci ...

Menefee Formation

Several vertebrates have been recovered from the Menefee Formation, including intermediate remains of baenids, trionychids, hadrosaurids and dromeaosaurids. An unnamed centrosaurine ceratopsid is also known.

Pajarito Formation

The Pajarito Formation is a Mesozoic geologic formation in eastern New Mexico and west Texas, primarily shale. Indeterminate fossil ornithischian tracks have been reported from the formation.

St. Marys Formation

The St. Marys Formation is a geologic formation in Maryland and Virginia. It preserves fossils dating back to the Neogene period. Fossils of the sperm whale Aulophyseter have been found in the formation.

Tres Hermanos Formation

The Tres Hermanos Formation is a Turonian geologic formation in the United States. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

Cadell Fault

The Cadell Fault is a north-south trending intra-plate geological fault in the Riverina area of New South Wales and Victoria within Australia. It straddles the Murray River and in quite recent prehistoric times has impacted its course, as well as ...

Loss Creek

Loss Creek is a river on southern Vancouver Island that flows from a point north of River Jordan, British Columbia due west to Sombrio Beach, mostly following an unusually long, straight, narrow, and steep-sided valley. This valley is the surface ...

Aomori Bay West Coast Fault Zone

The Aomori Bay West Coast Fault Zone is an active fault zone on the Tsugaru Peninsula in Aomori Prefecture and its capital city, Aomori. It parallels the west coast of Aomori Bay, running from north-northwest to south-southeast on the peninsula, ...

Futagawa-Hinagu fault zone

The Futagawa-Hinagu fault zone is a series of faults in Kumamoto Prefecture of Japan, which was responsible for the 2016 Kumamoto earthquakes. It consists of two fault zones along the west coast of Kumamoto, stretching over 100 km, making it the ...

Neodani Fault

Neodani Fault is a left lateral slip fault in central Japan, Gifu Prefecture, which ruptured causing the 1891 Mino–Owari earthquake in 1891. It caused a 6m vertical offset and 8m left lateral offset, and ruptured over 80 km. The quake was the lar ...

Tanna Fault

Tanna Fault is a left lateral strike-slip fault which runs along the northeast side of Izu Peninsula south 30 km to Izu City in Japan. It was responsible for the magnitude 7.0 1930 North Izu earthquake.

Urasoko fault

Urasoko fault 浦底断層 or Urasoko fault system is a seismic fault running for 39 kilometers near Tsuruga, Japan. Combined with the faults of the system, there are an additional 25 km of faults. It is notable in that it runs 250 meters from Unit # ...

Greendale Fault

The Greendale Fault is an active seismic fault in the middle of New Zealands South Island. This was one of the main faults that caused the Canterbury earthquake of 2010.

Yangsan Fault

Yangsan Fault is a seismic fault in southeastern Korea which was responsible for the 5.7 M w Gyeongju earthquake in 2016. It is located between Yeongdeok County and Busan with Yangsan.

Aire Valley Fault

The Aire Valley Fault is an inactive strike slip fault in Yorkshire, England. It is considered a northwestern continuation of the Morley-Campsall Fault Belt and extends northwards from the Huddersfield and Wakefield area into the South Craven fau ...

Pendleton Fault

The Pendleton Fault, sometimes called the Irwell Valley Fault, stretches for about 20 miles from Bolton in Greater Manchester along the Irwell Valley through Pendleton to Poynton in Cheshire, running northwest–southeast. The fault throws the beds ...

Wem-Bridgemere-Red Rock Fault System

The Wem-Bridgemere-Red Rock Fault System is a complex zone of intersecting faults which defines the eastern boundary of the Cheshire Basin, a deep sedimentary basin in the northwest of England and extending south into the northern Midlands. It in ...

Marianna Fault

The Marianna Fault is a fault located in the Crowleys Ridge area west of Marianna in eastern Arkansas. The discovery was first announced seismologists on January 21, 2009. This is separate from the new Madrid seismic zone which is 100 kilometers ...

Teton Fault

The Teton fault is a normal fault located in northwestern Wyoming. The fault has a length of 44 miles and runs along the eastern base of the Teton Range. Vertical movement on the fault has caused the dramatic topography of the Teton Range.

Wasatch Fault

The Wasatch Fault is an active fault located primarily on the western edge of the Wasatch Mountains in the U.S. states of Utah and Idaho. The fault is about 240 miles long, stretching from southern Idaho, through northern Utah, before terminating ...

Wabash Valley Seismic Zone

The Wabash Valley Seismic Zone is a tectonic region located in the Midwest of the United States, centered on the valley of the Lower Wabash River, along the state line between southeastern Illinois and southwestern Indiana.

Agua Poca

Agua Poca is a monogenetic volcano in the Puelen Department of Argentina. The volcano has the form of a cinder cone and has been active in the Pleistocene.

Arizaro volcanic field

Arizaro volcanic field is a group of volcanoes west of the Salar de Arizaro The volcanic field lies above the Western shores of the Salar de Arizaro. It consists of numerous andesibasalts Pleistocene lava flows and cinder cones of Holocene basalt ...

Chimpa

Chimpa is a volcano in Argentina, close to the border between the Jujuy Province and the Salta Province. The volcano is of Miocene age, one date given being 12 million years ago. Chimpa has two peaks, in 4.856 m 15.932 feet Cerro Chimpa and 4.796 ...

Farallon Negro (volcano)

Farallon Negro is a volcano in the Catamarca province of Argentina. Active between about 9-8 million years ago, it was formerly a stratovolcano or a multi vent volcano. Eventually, erosion removed most of the volcano and exposed the underlying st ...

Los Gemelos-El Saladillo

The Nazca Plate subducts beneath the South America Plate, giving rise to the volcanism in the Andean Central Volcanic Zone, including mafic back-arc volcanism which is often associated with tectonic lineaments. Los Gemelos 24°45s 66°10w, and El S ...

Nevados de Pastos Grandes

Nevados de Pastos Grandes is a Miocene volcanic centre in the Puna, Salta province, Argentina. It is a volcanic complex with several centres named El Queva, Gordo and Azufre. Some minor Pleistocene glaciation has affected the volcanic complex. Vo ...