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Cedar District Formation
The Cedar District Formation is a Formation (geology), geologic formation exposed on Vancouver Island, the Gulf Islands of British Columbia and San Juan Islands of Washington (state). It preserves fossils dating back to the Campanian Epoch (geology), Epoch of the Cretaceous Period (geology), period. It dates to the lower mid-Campanian. Paleobiology Flora *''Suciacarpa starrii'' Fauna *''Baculites, Baculites rex'' *''Baculites, Baculites anceps'' *''Baculites, Baculites occidentalis'' *''Baculites, Baculites inornatus'' *''Anapachydiscus, Anapachydiscus nelchinensis'' *''Metaplacenticeras'' sp. *''Canadoceras, Canadoceras newberryanum'' *''Pachydiscus, Pachydiscus neevesi'' *''Hoplitoplacenticeras, Hoplitoplacenticeras vancouverense'' *''Gaudryceras, Gaudryceras denmanense'' *''Neophylloceras'' sp. *''Condonella, Condonella suciensis'' *Ornithomimidae indet. *Theropoda indet. (possibly Tyrannosauridae) See also * List of fossiliferous stratigraphic units in Washington (state) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
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 (geology), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proximal Femur Of A Large Theropod Dinosaur From Washington State
Standard anatomical terms of location are used to describe unambiguously the anatomy of humans and other animals. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position provides a definition of what is at the front ("anterior"), behind ("posterior") and so on. As part of defining and describing terms, the body is described through the use of anatomical planes and axes. The meaning of terms that are used can change depending on whether a vertebrate is a biped or a quadruped, due to the difference in the neuraxis, or if an invertebrate is a non-bilaterian. A non-bilaterian has no anterior or posterior surface for example but can still have a descriptor used such as proximal or distal in relation to a body part that is nearest to, or furthest from its middle. International organisations have determined vocabularies that are often used as standards for subdisciplines of anatomy. For example, ''Terminologia Anato ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In Washington (state)
This article contains a list of fossil-bearing stratigraphic units in the state of Washington, U.S. Sites See also * Paleontology in Washington (state) Paleontology in Washington encompasses Paleontology, paleontological research occurring within or conducted by people from the United States, U.S. state of Washington (state), Washington. Washington has a rich fossil Fossil record, record spanning ... References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Washington (state) Washington Stratigraphic units Stratigraphy of Washington (state) Washington (state) geography-related lists United States geology-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyrannosauridae
Tyrannosauridae (or tyrannosaurids, meaning "tyrant lizards") is a family of coelurosaurian theropod dinosaurs that comprises two subfamilies containing up to fifteen genera, including the eponymous ''Tyrannosaurus''. The exact number of genera is controversial, with some experts recognizing as few as three. All of these animals lived near the end of the Cretaceous Period and their fossils have been found only in North America and Asia. Although descended from smaller ancestors, tyrannosaurids were almost always the largest predators in their respective ecosystems, putting them at the apex of the food chain. The largest species was ''Tyrannosaurus rex'', the most massive known terrestrial predator, which measured over in length and according to most modern estimates up to in weight. Tyrannosaurids were bipedal carnivores with massive skulls filled with large teeth. Despite their large size, their legs were long and proportioned for fast movement. In contrast, their arms were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theropoda
Theropoda (; from ancient Greek [wiktionary:θηρίον, , (''therion'') "wild beast"; wiktionary:πούς, , wiktionary:ποδός, (''pous, podos'') "foot"]) is one of the three major groups (Clade, clades) of Dinosaur, dinosaurs, alongside Ornithischia and Sauropodomorpha. Theropods, both extant and extinct, are characterized by hollow bones and three toes and claws on each limb. They are generally classed as a group of saurischian dinosaurs, placing them closer to sauropodomorphs than to ornithischians. They were ancestrally carnivorous, although a number of theropod groups evolved to become herbivores and omnivores. Members of the subgroup Coelurosauria and possibly some other or all theropods were covered in Feather, feathers. In the Jurassic, birds evolved from small specialized coelurosaurian theropods, and are currently represented by about 11,000 living species, making theropods the only group of dinosaurs alive today. Theropods first appeared during the Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ornithomimidae
Ornithomimidae (meaning "bird-mimics") is an extinct family of theropod dinosaurs which bore a superficial resemblance to modern ostriches. Ornithomimids were fast, omnivorous or herbivorous dinosaurs known mainly from the Late Cretaceous Period of Laurasia (now Asia and North America), though they have also been reported from the Lower Cretaceous Wonthaggi Formation of Australia. Description The skulls of ornithomimids were small, with large eyes, above relatively long and slender necks. All had toothless beaks. The fore limbs ('arms') were long and slender and bore powerful claws. The hind limbs were long and powerful, with a long foot and short, strong toes terminating in hooflike claws. Ornithomimids were probably among the fastest of all dinosaurs.Holtz, Thomas R. Jr. (2012) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,'Winter 2011 Appendix./ref> Like many other coelurosaurs, the ornithomimid hide was feathered rather than scaly. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Condonella
''Condonella'' is an extinct genus of land snail in the family Urocoptidae known from the fossil species ''Condonella suciensis'' of Western North America. History and classification ''C. suciensis'' is known from a single internal mold fossil found in north-western Washington state. The holotype specimen was collected on Sucia Island from the south side of Fossil Bay in a group of rock described as "Haslam fossiliferous shale". The area was stated by Roy Davidson McLellan to be fossil rich and Ward in 1978 assigned the strata to the Campanian age Cedar District Formation. The strata preserve what is thought to have been a shallow marine shelf environment that also had ammonites and inoceramid bivalves. The formation has also preserved fossils of other terrestrial organisms including a basal cornalean flowering plant, '' Suciacarpa starrii'' and a theropod femur, the first dinosaur identified from Washington State. There is differing opinion regarding what latitude the Ced ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neophylloceras
''Neophylloceras'' is an extinct genus of cephalopod belonging to the Ammonite Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ... subclass. References Cretaceous ammonites {{Ammonite-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaudryceras
''Gaudryceras'' is an ammonite genus belonging to the family Gaudryceratidae. These cephalopods were fast-moving nektonic carnivores. They lived in the Cretaceous period, from Albian to Maastrichtian The Maastrichtian ( ) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (geology), age (uppermost stage (stratigraphy), stage) of the Late Cretaceous epoch (geology), Epoch or Upper Cretaceous series (s ... stages (105.3 to 66.043 Ma).Sepkoski, JacSepkoski's Online Genus Database – Cephalopodes/ref> Subgenera and species Subg. ''Gaudryceras (Gaudryceras) '' de Grossouvre, 1894 :''Gaudryceras (Gaudryceras) alamedense'' (Smith, 1889) :''Gaudryceras (Gaudryceras) aureum'' (Anderson, 1958) :''Gaudryceras (Gaudryceras) cassisianum'' d'Orbigny, 1850 :''Gaudryceras (Gaudryceras) delvallense'' (Anderson, 1958) :''Gaudryceras (Gaudryceras) denmanense'' (Whiteaves, 1903) :''Gaudryceras (Gaudryceras) mitis'' Hauer, 1866 :''Gaudryceras (Gaudryc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pachydiscus
''Pachydiscus'' is an extinct genus of Ammonitina, ammonite from the Late Cretaceous and Early Paleocene with a worldwide distribution, and type (biology), type for the desmoceratacean family Pachydiscidae. The genus' type species is ''P. neubergicus''. Altogether some 28 species have been described. The shell of ''Pachydiscus'' is compressed and high-whorled, with an oval or flat sided section. Ribs tend to be differentiated into short umbilical and separate ventro-lateral sets, with a smooth area between. Some Hungary, Hungarian specimens of this genus reached in diameter. ''Pachydiscus'' includes two subgenera, ''P. (Pachysiscus)'' from the Campanian in which the ribs persist, and ''P. (Neodesmoceras)'' from the Maastrichtian in which ribs disappear early, leaving an almost smooth shell. Biostratigraphic significance The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of ''Pachydiscus neubergicus'' as the List of Global Boundary Strat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
