|
Stratigraphic Units
A stratigraphic unit is a volume of Rock (geology), rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrology, petrographic, lithology, lithologic or paleontology, paleontologic features (facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary rock, sedimentary and volcanic rocks are subdivided the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are Bed, Member, Formation, Group and Supergroup. Formal names of lithostratigraph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ville Formation
The Ville Formation is a geologic formation in Germany. It preserves fossils dating back to the Neogene period. Lignite of the Ville Formation is excavated in North Rhine-Westphalia. Description The Middle Miocene Hambach 6C site located within the Ville Formation is believed to have been deposited in an estuarine setting in a large fluviatile system with extended coal swamps surrounding it, as supported by sedimentological and palaeobotanical evidence. Many tetrapod remains found in the Ville Formation are associated with tropical elements such as primates, chameleons and carettochelyine turtles, suggesting the age of the fauna to be at approximately 15.5 Ma during the Middle Miocene Climate Transition. The paleoflora of the formation also supports a tropical-like climate at the time of deposition. The younger late Pliocene (approximately 2.5 Ma) sites of Hambach 11 & 13 are believed to be deposited in oxygenated water and currents in a river channel setting in close vicinity t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veldhoven Formation
The Veldhoven Formation ( nl, Formatie van Veldhoven; abbreviation: VE) is a geologic formation in the subsurface of the Netherlands. The formation consists of an alternation of marine clay and sand from the Oligocene epoch. Lithology The Veldhoven Formation has a shallow marine (less than 200 meters deep) or beach facies. It consists of an alternation of glauconiferous and micaceous fine sands and micaceous clays. In some places hardgrounds or shell-rich layers occur. The formation is Chattian, 28.4 to 23.0 million years old. Stratigraphy The Veldhoven Formation is part of the Middle North Sea Group and is named after the town of Veldhoven in North Brabant, the type location. Actually the type section is in a well log, since the formation only rarely crops out at the surface. The formation is subdivided into three members ( nl, laagpakketten): *the Someren Member, glauconiferous fine sand; *the Wintelre Member, greenish silty clay; *the Voort Member, greenish clayey s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongeren Formation
The Tongeren Formation ( nl, Formatie van Tongeren; abbreviation: TO) is a geologic formation in the subsurface of the Netherlands. The formation consists of shallow marine, epicontinental and continental sediments, predominantly clay and sand from the late Eocene and early Oligocene epochs (between 37 and 30 million years old). The Tongeren Formation is part of the Middle North Sea Group and correlates with the Tongeren Group from Belgian stratigraphy. The name was introduced by Belgian geologist André Hubert Dumont in 1849. Lithologies and subdivision The Tongeren Formation is subdivided into three members: *the Goudsberg Member, an alternation of clay with chert nodules and thin lignite layers; *the Klimmen Member, micaceous fine sand; and *the Zelzate Member, shallow marine glauconiferous sand alternating with clay layers. Stratigraphic position In southern Limburg the Tongeren Formation is lies on top of formations of the Lower North Sea Group (in particular the lat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rupel Formation
The Rupel Formation (abbreviation: RU) is a geologic formation in the subsurface of the Netherlands that consists of Oligocene marine sands and clays. The Rupel Formation is part of the Middle North Sea Group and correlates exactly with the Belgian Rupel Group. Name The Rupel Formation was first described by André Hubert Dumont in 1849. The formation is taken from Belgian lithostratigraphy, although it is considered a group in Belgium. The age in which the formation formed is the Rupelian (34 to 28 million years ago), a subdivision of the Oligocene epoch. The age and the formation are both named after the Belgian river Rupel. Facies and lithologies The Rupel Formation can be 250 meters thick at maximum. During the Rupelian age the Netherlands (and Belgium) were covered by a shallow sea, which became deeper towards the northwest. In the northwest, the sedimentary facies can be more than 500 m deep marine, while in southeastern parts of the Netherlands the formation has a nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oosterhout Formation
The Oosterhout Formation is a geological formation in the subsoil in the central and south area of the Netherlands. The formation was formed during the Pliocene (5.333 million to 2.58 million years BP). The formation was named after the city of Oosterhout in the province of North Brabant. The Oosterhout Formation mainly consists of sand, often containing glauconite. In the upper layers, clay is also present. The Oosterhout Formation is usually right on top of the Miocene Breda Formation The Breda Formation ( nl, Formatie van Breda; abbreviation: BR) is a geologic formation in the subsurface of the Netherlands. The formation consists of marine glauconiferous sands and clays that were deposited during the Miocene epoch. Although .... Geography of the Netherlands {{Netherlands-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle North Sea Group
The Middle North Sea Group (abbreviation: NM) is a group of geologic formations in the Dutch subsurface, part of the North Sea Supergroup. The three formations of this group form a thick sequence of sediments in the Dutch subsurface, they crop out in parts of the southern Netherlands. The Middle North Sea Group was deposited from the late Eocene to late Oligocene, between 37 and 23 million years ago. Its three formations are (from old to young) the Tongeren, Rupel and Veldhoven Formations. The Tongeren Formation has a continental to paralic facies, the other two consist mainly of shallow marine clays and sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of s ...s. References Geologic groups of Europe Geologic formations of the Netherlands Lithostratigraphy of the Netherlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maastricht Formation
The Maastricht Formation (Dutch: ''Formatie van Maastricht''; abbreviation: MMa), named after the city of Maastricht in the Netherlands, is a geological formation in the Netherlands and Belgium whose strata date back to the Late Cretaceous, within 500,000 years of the Cretaceous–Paleogene boundary, now dated at . The formation is part of the Chalk Group and is between thick. It crops out in southern parts of Dutch and Belgian Limburg and adjacent areas in Germany. It can be found in the subsurface of northern Belgium and southeastern Netherlands, especially in the Campine Basin and Roer Valley Graben. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 588-593. . Lithology The Maastricht Formation consists of soft, sand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landen Formation
The Landen Formation (abbreviation: LA) is a lithostratigraphic unit (a set of rock strata) in the subsurface of the Netherlands. This formation shares its name with the Belgian Landen Group, but the Belgian unit is thinner and has different definitions. The Landen Formation consists of shallow marine and lagoonal sediments (mostly clay, sandy clay and marl) from the late Paleocene to early Eocene (between 58 and 54 million years old). Dutch stratigraphers see the Landen Formation as part of the Lower North Sea Group. Lithology The Landen Formation can be maximally 150 meters in thickness. It is subdivided into five only regionally recognized members: *The Swalmen Member, lagoonal clay, sometimes with small lignite layers; *The Reusel Member, green sandy clay, loam and sand; *The Liessel Member, mica, pyrite and glauconite bearing clay, containing plant fossils; *The Orp Member, greenish grey sand; *The Gelinden Member, calcareous clay. Some of the sandy layers can have bee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
