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Hannut Formation
The Hannut Formation (french: Formation de Hannut; nl, Formatie van Hannut; abbreviation: Hn) is a geologic formation in the subsurface of northern Belgium. The formation consists of marine clay and silt, alternating with more sandy layers. On top of this the lithology changes to limestone, siltstone and sandstone and the top of the formation is formed by a layer of glauconite bearing sand. The Hannut Formation was formed during the early to middle Thanetian age (Late Paleocene, about 57 million years ago). The formation is named after the town of Hannut in the province of Liège. Lithologies The Hannut Formation can be about 100 meters thick in the Campine Basin and about 55 meters thick in the Mons Basin. In between these two basins the thickness varies between 40 and 20 meters. The formation is subdivided into five members: *The Chercq Member, tuffite, clay and glauconite bearing sand layers. This member is most distinctively recognizable in the province of Hainaut; *The Li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thanetian
The Thanetian is, in the International Commission on Stratigraphy, ICS Geologic timescale, the latest age (geology), age or uppermost stage (stratigraphy), stratigraphic stage of the Paleocene epoch (geology), Epoch or series (stratigraphy), Series. It spans the time between . The Thanetian is preceded by the Selandian Age and followed by the Ypresian Age (part of the Eocene). The Thanetian is sometimes referred to as the Late Paleocene. Stratigraphic definition The Thanetian was established by Switzerland, Swiss geologist Eugène Renevier in 1873. The Thanetian is named after the Thanet Formation, the oldest Cenozoic deposit of the London Basin, which was first identified in the area of Kent (southern England) known as the Isle of Thanet. The base of the Thanetian Stage is laid at the base of magnetic chronozone C26n. The references profile (Global Boundary Stratotype Section and Point) is in the Zumaia section (43° 18'N, 2° 16'W) at the beach of Itzurun, Pais Vasco, northern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heers Formation
The Heers Formation ( nl, Formatie van Heers; french: Formation de Heers; abbreviation: Hs) is a geologic formation in the subsurface of Belgium. The formation consists of sand and marl and was deposited in the shallow sea that covered Belgium during the middle to late Selandian age of the Paleocene epoch. The formation is subdivided into two members: at the base green, glauconiferous sand (Orp Member), on top calcareous clay and marl in which plant fossils have been found (Gelinden Member). This sequence formed during a marine transgression. The Orp Member represents a near coastal marine environment, the Gelinden Member formed in shallow marine circumstances but further from the land. The Heers Formation occurs in the subsurface of the northern and eastern parts of Flanders. In Limburg it reaches its maximal thickness at about 60 meters. The Heers Formation is stratigraphically on top of Cretaceous and early Paleocene deposits, such as the Opglabbeek Formation or the Houthem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flanders
Flanders (, ; Dutch: ''Vlaanderen'' ) is the Flemish-speaking northern portion of Belgium and one of the communities, regions and language areas of Belgium. However, there are several overlapping definitions, including ones related to culture, language, politics, and history, and sometimes involving neighbouring countries. The demonym associated with Flanders is Fleming, while the corresponding adjective is Flemish. The official capital of Flanders is the City of Brussels, although the Brussels-Capital Region that includes it has an independent regional government. The powers of the government of Flanders consist, among others, of economic affairs in the Flemish Region and the community aspects of Flanders life in Brussels, such as Flemish culture and education. Geographically, Flanders is mainly flat, and has a small section of coast on the North Sea. It borders the French department of Nord to the south-west near the coast, the Dutch provinces of Zeeland, North Brabant an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lagoon
A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') and ''atoll lagoons''. They have also been identified as occurring on mixed-sand and gravel coastlines. There is an overlap between bodies of water classified as coastal lagoons and bodies of water classified as estuaries. Lagoons are common coastal features around many parts of the world. Definition and terminology Lagoons are shallow, often elongated bodies of water separated from a larger body of water by a shallow or exposed shoal, coral reef, or similar feature. Some authorities include fresh water bodies in the definition of "lagoon", while others explicitly restrict "lagoon" to bodies of water with some degree of salinity. The distinction between "lagoon" and "estuary" also varies between authorities. Richard A. Davis Jr. restrict ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tienen Formation
The Tienen Formation ( nl, Formatie van Tienen; french: Formation de Tienen; abbreviation: Ti) is a geologic formation in the subsurface of northern Belgium. The formation crops out in the province of Hainaut and the Hesbaye region in the province of Limburg. It has a late Thanetian (Paleocene) to early Ypresian (Eocene) age. The Tienen Formation consists of clay with thin lignite layers and lithified wood, sand (sometimes with shells) and marl. It has a continental to lagoonal sedimentary facies. The formation is a lagerstätte for fossils of vertebrate animals. The Tienen Formation forms together with the older marine clays and sands of the Hannut Formation the Landen Group The Landen Group is a lithostratigraphic unit (a "group" of rock strata) in the Belgian subsurface. The group consists of two formations of Thanetian (late Paleocene The Paleocene, ( ) or Palaeocene, is a geological epoch (geology), epoch that .... The Tienen Formation is subdivided into four memb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithostratigraphy
Lithostratigraphy is a sub-discipline of stratigraphy, the geological science associated with the study of strata or rock layers. Major focuses include geochronology, comparative geology, and petrology. In general, strata are primarily igneous or sedimentary relating to how the rock was formed. Sedimentary layers are laid down by deposition of sediment associated with weathering processes, decaying organic matter (biogenic) or through chemical precipitation. These layers are often distinguishable as having many fossils and are important for the study of biostratigraphy. Igneous layers occur as stacks of lava flows, layers of lava fragments (called tephra) both erupted onto the Earth's surface by volcanoes, and in layered intrusions formed deep underground. Igneous layers are generally devoid of fossils and represent magmatic or volcanic activity that occurred during the geologic history of an area. There are a number of principles that are used to explain the appearance of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithification
Lithification (from the Ancient Greek word ''lithos'' meaning 'rock' and the Latin-derived suffix ''-ific'') is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Essentially, lithification is a process of porosity destruction through compaction and cementation. Lithification includes all the processes which convert unconsolidated sediments into sedimentary rocks. Petrifaction, though often used as a synonym, is more specifically used to describe the replacement of organic material by silica in the formation of fossils. See also * Diagenesis * Parent rock * Weathering Weathering is the deterioration of rocks, soils and minerals as well as wood and artificial materials through contact with water, atmospheric gases, and biological organisms. Weathering occurs ''in situ'' (on site, with little or no movement), ... References {{Geology-stub Geological processes Sedimentary rocks Petrology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hainaut (province)
Hainaut (, also , , ; nl, Henegouwen ; wa, Hinnot; pcd, Hénau), historically also known as Heynowes in English, is a Provinces of regions in Belgium, province of Wallonia and Belgium. To its south lies the France, French department of Nord (French department), Nord, while within Belgium it borders (clockwise from the North) on the Flemish Region, Flemish provinces of West Flanders, East Flanders, Flemish Brabant and the Walloon provinces of Walloon Brabant and Namur (province), Namur. Its capital is Mons (Dutch ''Bergen'') and the most populous city is Charleroi, the province's urban, economic and cultural hub, the financial capital of Hainaut and the List of cities in Belgium, fifth largest city in the country by population. Hainaut has an area of and as of January 2019 a population of 1,344,241. Another remarkable city is Tournai (Dutch ''Doornik'') on the Scheldt river, one of the oldest cities of Belgium and the first capital of the Frankish Empire. Hainaut province ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuffite
Tuffite is a tuff containing both pyroclastic and detrital materials, but predominantly pyroclasts. According to IUGS definition tuffite contains 75 to 25% volcanic (epiclastic) material. There are several classifications that define tuffite. The classification present in the IUGS recommendation are based on the definition established by Schmid (1981). Shvetsov defined tuffites as rocks containing 50 to 90% of the volcanic fragments. Tuffite should therefore contain more than half of volcanic material. If rock contains more than 75 to 90% of pyroclastic material it is referred to as tuff. Some other, mostly older sources state that tuffite may contain 10 to 50% volcanic material. (in Czech) The adjective ''tuffitic'' is used for sediments containing less than 25% volcanic fragments. A tuffite consists of angular and/or rounded fragments of effusive rocks and their minerals, also may contain volcanic ash, pumice and clay minerals. Nonvolcanic material may consist of terrigen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Member (stratigraphy)
A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or 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 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 lithostratigraphic units are assigned by geological surveys. Units of formation or hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campine Basin
The Campine (French ) or De Kempen (Dutch ) is a natural region situated chiefly in north-eastern Belgium and parts of the south-eastern Netherlands which once consisted mainly of extensive moors, tracts of sandy heath, and wetlands. It encompasses a large northern and eastern portion of Antwerp Province and adjacent parts of Limburg in Belgium, as well as portions of the Dutch province of North Brabant (area southwest of Eindhoven) and Dutch Limburg around Weert. Today the Campine is becoming a popular touristic destination. Old farms have been transformed into bed-and-breakfast hotels, the restaurant and café business is very active, and an extensive cycle touring network has come into existence over the past few years. Part of the Campine is protected as the '' Hoge Kempen Nationaal Park'' (High Campine National Park). It is located in the east of the Belgian province Limburg, between the city of Genk and the Meuse valley and was opened in March 2006. Covering almost , i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saunders_Quarry-1.jpg "Click for more on -> Sandstone")
