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Gastonia (dinosaur)
''Gastonia'' is a genus of herbivorous ankylosaurian dinosaur from the Early Cretaceous of North America, around 139 to 125.77 million years ago. It is often considered a nodosaurid closely related to ''Polacanthus''. ''Gastonia'' has a sacral shield and large shoulder spikes. Discovery and species The type specimen of ''Gastonia burgei'' ( CEUM 1307) was discovered in a bonebed from the limestone strata of the lower Cedar Mountain Formation in Yellow Cat Quarry, Grand County, eastern Utah, the type specimen consisting of a single skull. The type specimen was found alongside 4 partial skeletons of ''Gastonia that'' were placed as paratypes, along with the type specimen of '' Utahraptor'' and an iguanodontid. ''Gastonia'' is among the most common dinosaur fossils in the Cedar Mountain Formation, with many individuals being found across several quarries in the southwest.Kirkland, J.I. (1998). A polacanthine ankylosaur (Ornithischia: Dinosauria) from the Early Cretaceous (Barre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Cretaceous
The Early Cretaceous (geochronology, geochronological name) or the Lower Cretaceous (chronostratigraphy, chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 143.1 Megaannum#SI prefix multipliers, Ma to 100.5 Ma. Geology Proposals for the exact age of the Barremian–Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining Anoxic event#Cretaceous, early Aptian Oceanic Anoxic Event 1a (OAE1a) was dated to 123.1±0.3 Ma, limiting the possible range for the boundary to c. 122–121 Ma. There is a possible link between this anoxic event and a series of Early Cretaceous large igneous provinces (LIP). The Ontong Java Plateau, Ontong Java-Manihiki Plateau, Manihiki-Hikurangi Plateau, Hikurangi large igneous province, emplaced in the South Pacific at c. 120 Ma, is by far the largest LIP in Earth's history. The Onto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iguanodontidae
Iguanodontidae is a family of iguanodontians belonging to Styracosterna, a derived clade within Ankylopollexia. The clade is formally defined in the ''PhyloCode'' by Daniel Madzia and colleagues in 2021 as "the largest clade containing '' Iguanodon bernissartensis'', but not '' Hadrosaurus foulkii''". Characterized by their elongated maxillae, they were herbivorous and typically large in size. This family exhibited locomotive dynamism; there exists evidence for both bipedalism and quadrupedalism within iguanodontid species, supporting the idea that individual organisms were capable of both locomoting exclusively with their hind limbs and locomoting quadrupedally. Iguanodontids possess hoof-like second, third, and fourth digits, and in some cases, a specialized thumb spike and an opposable fifth digit. Their skull construction allows for a strong chewing mechanism called a transverse power stroke. This, paired with their bilateral dental occlusion, made them extremely effective ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastonia Burgei Dinosaur
Gastonia may refer to: * ''Gastonia'' (plant), a genus in the ivy or ginseng family * ''Gastonia'' (dinosaur), a genus of ankylosaur *Gastonia, North Carolina, United States **Gastonia station, an Amtrak train station *Gastonia, Texas Gastonia is an unincorporated community in Kaufman County, located in the U.S. state of Texas. According to the Handbook of Texas, the community had a population of 30 in 2000. It is located within the Dallas/Fort Worth Metroplex. History Th ..., an unincorporated community * Gastonia novels, several novels concerned with the events of the 1929 Loray Mill strike {{disambig, genus, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autapomorphies
In phylogenetics, an autapomorphy is a distinctive feature, known as a derived trait, that is unique to a given taxon. That is, it is found only in one taxon, but not found in any others or outgroup taxa, not even those most closely related to the focal taxon (which may be a species, family or in general any clade). It can therefore be considered as an apomorphy in relation to a single taxon. The word ''autapomorphy'', introduced in 1950 by German entomologist Willi Hennig, is derived from the Greek words αὐτός, ''autos'' "self"; ἀπό, ''apo'' "away from"; and μορφή, ''morphḗ'' = "shape". Discussion Because autapomorphies are only present in a single taxon, they do not convey information about relationship. Therefore, autapomorphies are not useful to infer phylogenetic relationships. However, autapomorphy, like synapomorphy and plesiomorphy is a relative concept depending on the taxon in question. An autapomorphy at a given level may well be a synapomorphy at a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gregory S
Gregory may refer to: People and fictional characters * Gregory (given name), including a list of people and fictional characters with the given name * Gregory (surname), a surname * Gregory (The Walking Dead), fictional character from the walking dead * Gregory (Five Nights at Freddy's), main protagonist of '' Five Nights at Freddy's: Security Breach'' ** Places Australia *Gregory, a town in the Northern Territory * Gregory, Queensland, a town in the Shire of Burke ** Electoral district of Gregory, Queensland, Australia * Gregory, Western Australia. United States * Gregory, South Dakota * Gregory, Tennessee * Gregory, Texas Outer space * Gregory (lunar crater) * Gregory (Venusian crater) Other uses * "Gregory" (''The Americans''), the third episode of the first season of the television series ''The Americans'' See also * Greg (other) * Greggory * Gregoire (other) * Gregor (other) * Gregores (other) * Gregorian (other) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastonia Scale
Gastonia may refer to: * ''Gastonia'' (plant), a genus in the ivy or ginseng family * ''Gastonia'' (dinosaur), a genus of ankylosaur *Gastonia, North Carolina, United States **Gastonia station, an Amtrak train station *Gastonia, Texas Gastonia is an unincorporated community in Kaufman County, located in the U.S. state of Texas. According to the Handbook of Texas, the community had a population of 30 in 2000. It is located within the Dallas/Fort Worth Metroplex. History Th ..., an unincorporated community * Gastonia novels, several novels concerned with the events of the 1929 Loray Mill strike {{disambig, genus, geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gargoyleosaurus
''Gargoyleosaurus'' (meaning "gargoyle lizard") is one of the earliest ankylosaurs known from reasonably complete fossil remains. The holotype was discovered in 1995 at the Bone Cabin Quarry West locality, in Albany County, Wyoming in exposures of the Upper Jurassic (Kimmeridgian to Tithonian stages) Morrison Formation. The type species, ''G. parkpinorum'' (originally ''G. parkpini'') was described by Ken Carpenter ''et al.'' in 1998. A mounted skeletal reconstruction of ''Gargoyleosaurus parkpinorum'' can be seen at the Denver Museum of Nature and Science and, alongside a couple skeletons of baby ''Stegosaurus'', has been on display there since around 2002. ''Gargoyleosaurus'' was present in stratigraphic zone 2 of the Morrison Formation.Foster, J. (2007). "Appendix." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. pp. 327–329. Discovery The holotype specimen of ''Gargoyleosaurus parkpinorum'' was collected by Western ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyurethane
Polyurethane (; often abbreviated PUR and PU) is a class of polymers composed of organic chemistry, organic units joined by carbamate (urethane) links. In contrast to other common polymers such as polyethylene and polystyrene, polyurethane term does not refer to the single type of polymer but a group of polymers. Unlike polyethylene and polystyrene, polyurethanes can be produced from a wide range of starting materials resulting in various polymers within the same group. This chemical variety produces polyurethanes with different chemical structures leading to many List of polyurethane applications, different applications. These include rigid and flexible foams, and coatings, adhesives, Potting (electronics), electrical potting compounds, and fibers such as spandex and polyurethane laminate (PUL). Foams are the largest application accounting for 67% of all polyurethane produced in 2016. A polyurethane is typically produced by reacting a polymeric isocyanate with a polyol. Since a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barremian
The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 125.77 Ma (million years ago) and 121.4 ± 1.0 Ma (Historically, this stage was placed at 129.4 million to approximately 125 million years ago) It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is preceded by the Hauterivian and followed by the Aptian Stage.See Gradstein ''et al.'' (2004) or the online geowhen database (link below) Stratigraphic definitions The original type locality for the Barremian Stage is in the vicinity of the village of Barrême, Alpes-de-Haute-Provence, France. Henri Coquand defined the stage and named it in 1873. The base of the Barremian is determined by the first appearance of the ammonites '' Spitidiscus hugii'' and ''Spitidiscus vandeckii''. The end of the Barremian is determined by the geomagnetic reversal at the start of the M0r chronozone, which is biologically near the first appearance of the ammonite '' Paradesh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hauterivian
The Hauterivian is, in the geologic timescale, an age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.6 ± 2 Ma and 125.77 (million years ago). The Hauterivian is preceded by the Valanginian and succeeded by the Barremian. Stratigraphic definitions The Hauterivian was introduced in scientific literature by Swiss geologist Eugène Renevier in 1873. It is named after the Swiss town of Hauterive at the shore of Lake Neuchâtel. The base of the Hauterivian is defined as the place in the stratigraphic column where the ammonite genus '' Acanthodiscus'' first appears. A reference profile for the base (a GSSP) was officially ratified by the International Union of Geological Sciences in December of 2019, and is placed in La Charce, France. The top of the Hauterivian (the base of the Barremian) is at the first appearance of ammonite species '' Spitidiscus hugii''. In the ammonite biostratigraphy of the Tethys domain, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Denver Museum Of Nature And Science
The Denver Museum of Nature & Science is a municipal natural history and science museum in Denver, Colorado. It is a resource for informal science education in the Rocky Mountain region. A variety of exhibitions, programs, and activities help museum visitors learn about the natural history of Colorado, Earth, and the universe. The building houses more than one million objects in its collections including natural history and anthropological materials, as well as archival and library resources. The museum is an independent, nonprofit institution with approximately 450 full-time and part-time staff, more than 1,000 volunteers, and a 29-member board of trustees. It is accredited by the American Alliance of Museums and is a Smithsonian Institution affiliate. In 2022, the museum received 1,151,000 visitors, ranking eighteenth in the List of most-visited museums in the United States. It was the fourth-most-visited U.S. museum of nature and science. The museum's official online magazine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
