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Swithland Formation
The Swithland Formation is a Formation (geology), geologic formation in Leicestershire, and lies within the wider Swithland Wood and The Brand area. It preserves ichnotaxon dating back to the Cambrian Period (geology), period. Paleobiota The Swithland Formation preserves a lot of Cambrian ichnogenera, which are usually attributed to burrowing organisms like marine annelids. The most important one from this formation is Teichichnus, which was the first one found, and the one that proved this Brand Group was Cambrian in age, which also led to the discovery and research of a diorite unconformity between the Brand Group, Brand and Maplewell Groups. Ichnogenera See also * List of fossiliferous stratigraphic units in the United Kingdom References * {{cite web, title= Fossilworks: Gateway to the Paleobiology Database, author= ((Various Contributors to the Paleobiology Database)), url= https://www.fossilworks.org, access-date= 17 December 2021 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (geology)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Annelids
The annelids (), also known as the segmented worms, are animals that comprise the phylum Annelida (; ). The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments. The annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. Most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species. Cladistic research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-group ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In The United Kingdom
*List of fossiliferous stratigraphic units in England See also * Lists of fossiliferous stratigraphic units in Europe * Lists of fossiliferous stratigraphic units in the United Kingdom References * {{DEFAULTSORT:Fossiliferous stratigraphic units in England England England is a Countr ... * List of fossiliferous stratigraphic units in Wales * List of fossiliferous stratigraphic units in Scotland * List of fossiliferous stratigraphic units in Northern Ireland {{DEFAULTSORT:Fossiliferous stratigraphic units in the United Kingdom * * United Kingdom geology-related lists United Kingdom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teichichnus Burrows
''Teichichnus'' is an ichnogenus with a distinctive form produced by the stacking of thin 'tongues' of sediment, atop one another. They are believed to be fodinichnia, with the organism adopting the habit of retracing the same route through varying heights of the sediment, which would allow it to avoid going over the same area. These 'tongues' are often quite sinuous, reflecting perhaps a more nutrient-poor environment in which the feeding animals had to cover a greater area of sediment, in order to acquire sufficient nourishment. ''Teichichnus'' is recognized as a series of tightly packed, concave-up or down laminae, and lacks an outside border or lining, which distinguishes ''Teichichnus'' from the ''Diplocraterion'' ichnogenus An ichnotaxon (plural ichnotaxa) is "a taxon based on the fossilized work of an organism", i.e. the non-human equivalent of an artifact. ''Ichnotaxon'' comes from the Ancient Greek (''íchnos'') meaning "track" and English , itself derived from .... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skolithos
''Skolithos'' (formerly spelled ''Scolithus'' or ''Skolithus'') is a common trace fossil ichnogenus that is, or was originally, an approximately vertical cylindrical burrow with a distinct lining. It was produced globally by a variety of organisms, mostly in shallow marine environments, and appears as linear features in sedimentary rocks. Depositional environments ''Skolithos'' ranges in age from early Cambrian to the present and is found throughout the world. They occur in sediments and sedimentary rocks, primarily sands and sandstones. They are typically marine in origin, and are commonly associated with high-energy environments close to the shoreline. They have also been reported from freshwater lacustrine settings, but have rarely been described from carbonate rocks. Vertical ''Skolithos'' can also occur in alluvial sediments such as braided river deposits, where the periodic fluctuation of water is an important factor in the formation of this structure. This periodic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planolites (34663777254)
''Planolites'' is an ichnogenus found throughout the Ediacaran and the Phanerozoic that is made during the feeding process of worm-like animals. The traces are generally small, , unlined, and rarely branched, with fill that differs from the host rock. Distribution ''Planolites'' fossils have been found in Africa, Asia, Europe, Antarctica, and the Americas (with most specimens found in North America). Ichnospecies Ichnospecies in ''Planolites'' include: *''P. annularis'' Walcott, 1890 *''P. annularius'' Walcott, 1890 *''P. ballandus'' Webby, 1970 *''P. beverleyensis'' Billings, 1862 *''P. incipiens'' (Billings, 1861) *''P. montanus'' Richter, 1937 *''P. reticulatus'' Alpert, 1975 *''P. serpens'' Webby, 1970 *''P. striatus'' (Hall, 1852) *''P. terraenovae'' Fillion and Pickerill, 1990 *''P. virgatus'' (Hall, 1847) See also * List of Ediacaran genera The existence of life, especially that of animals, before the Cambrian had long been the subject of debate in paleontology. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maplewell Group
The Maplewell Group is an Ediacaran lithostratigraphic group (a sequence of rock strata) present in Leicestershire in the English Midlands. The strata are exposed in Charnwood Forest, west of Leicester. Besides a variety of volcaniclastic sandstones and mudstones, there are various breccias and tuffs. The tuffs which were laid down in water are fossiliferous; ''Charnia'', ''Charniodiscus'' and '' Cyclomedusa'', are all recorded from these rocks. With the discovery of '' Teichichnus'' in the overlying Swithland Formation of the Brand Group, alongside several other ichnogenera, researchers were able to confidentially date the Brand Group to the Lower Cambrian, which has led to the research and discovery of a major hiatus and diorite intrusion between this group and the Brand Group. Using Zircon U-Pb dating, a date is returned of , suggesting the intrusion is Lower Edicaran in age. This also caused the Brand Group to be taken out of the Charnian Surpergroup, making the Maplewell G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teichichnus
''Teichichnus'' is an ichnogenus with a distinctive form produced by the stacking of thin 'tongues' of sediment, atop one another. They are believed to be fodinichnia, with the organism adopting the habit of retracing the same route through varying heights of the sediment, which would allow it to avoid going over the same area. These 'tongues' are often quite sinuous, reflecting perhaps a more nutrient-poor environment in which the feeding animals had to cover a greater area of sediment, in order to acquire sufficient nourishment. ''Teichichnus'' is recognized as a series of tightly packed, concave-up or down laminae, and lacks an outside border or lining, which distinguishes ''Teichichnus'' from the ''Diplocraterion'' ichnogenus An ichnotaxon (plural ichnotaxa) is "a taxon based on the fossilized work of an organism", i.e. the non-human equivalent of an artifact. ''Ichnotaxon'' comes from the Ancient Greek (''íchnos'') meaning "track" and English , itself derived from .... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Period (geology)
The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardised international units of geological time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
