|
Cordobés Formation
The Cordobés Formation is an Early Devonian ( Pragian to Emsian) geologic formation of the Durazno Group in the Paraná Basin in the Durazno Department of central Uruguay. The shallow marine shales preserve trilobite, bivalve, gastropod and brachiopod fossils.Emsian Loc. 1 of Melo: Uraguayan outcrop belt at Fossilworks.orgDaners et al., 2017 Description The Cordobés Formation is characterized by reddish fine shale deposited in a |
Geological Formation
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 Wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strophomenata
Strophomenata is an extinct class of brachiopods in the subphylum Rhynchonelliformea. Orders Billingsellida An order that contains the suborder Clitambonitidina (and others?) . Orthotetida An order or superfamily that includes the Chilidiopsoidea.LE Holmer, Z Zhang, TP Topper, and L Popov 2017. The attachment strategies of Cambrian kutorginate brachiopods: the curious case of two pedicle openings and their phylogenetic significance. Journal of Paleontology, 2017. Ontogeny given by Bassett and Popov (2017), resembling that of Kutorginides. Believed to be sister to Strophomenides, = Strophomenida + Billinsellida + Productida.Bassett, M.G., and Popov, L.E. (2017). Earliest ontogeny of the Silurian orthotetide brachiopod ~Coolinia~ and its significance for interpreting strophomenate phylogeny. Lethaia 50, 504–510. Includes the Chileids (e.g. ''Coolinia''). References External links * * * Strophomenata, Prehistoric protostome classes {{paleo-protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentaculites
''Tentaculites'' is an extinct genus of conical fossils of uncertain affinity, class Tentaculita, although it is not the only member of the class. It is known from Lower Ordovician to Upper Devonian deposits both as calcitic shells with a brachiopod-like microstructure and carbonaceous 'linings'. The "tentaculites" (i.e. tentaculita) are also referred to as the styliolinids. Affinity The taxonomic classification of tentaculitids is uncertain. Some grouped them with pteropods, but there is no modern support and only superficial similarity. They may also be related to other conical shells of uncertain affinity including cornulitids, ''Anticalyptraea'', microconchids and trypanoporids. Their shell microstructure has warranted their comparison with the brachiopods and phoronids, and the possible Ediacaran lophophorate ''Namacalathus''. Morphology Tentaculitids have ribbed, cone-shaped shells which range in length from 5 to 20 mm. Some species septate; their embryonic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lophophorata
The Lophophorata are a Lophotrochozoan clade consisting of the Brachiozoa and the Bryozoa. They have a lophophore. Molecular phylogenetic analyses suggest that lophophorates are protostomes, but on morphological grounds they have been assessed as deuterostomes. Fossil finds of a segmented worm named Wufengella ''Wufengella'' is a genus of extinct camenellan " tommotiid" that lived during the Early Cambrian ( Stage 3). Described in 2022, the only species ''Wufengella bengtsonii'' was discovered from the Maotianshan Shales of Chiungchussu (Qiongzhusi) F ... suggest that they evolved from a worm close to annelids. References {{Protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calmonia
''Calmonia'' is an extinct genus of trilobites. It contains one species: ''C. curvioculata''. Fossils of ''Calmonia'' have been found in the Emsian to Eifelian Ponta Grossa Formation and Chapada Group of Brazil, the Belén and Sica Sica Formations of Bolivia and the Cordobés Formation of Uruguay.''Calmonia'' at Fossilworks
Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database
The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ... .org
References [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metacryphaeus
''Metacryphaeus'' is an extinct genus of trilobites from the family Calmoniidae. ''Metacryphaeus'' fossils have been found in Bolivia, Brazil, South Africa and Uruguay Uruguay (; ), officially the Oriental Republic of Uruguay ( es, República Oriental del Uruguay), is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast; while bordering .... The genus was named in 1907.F. R. C. Reed. 1907. A new species of '' Lichas''. ''Geological Magazine'' 54:396-400 References Phacopida genera Calmoniidae {{phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burmeisteria
''Burmeisteria'' is a genus of trilobites in the order Phacopida (family Homalonotidae) that existed during the lower Devonian in what is now South Africa. It was described by Salter in 1865, and the type species is ''Burmeisteria herschelii'', which was originally described under the genus ''Homalonotus'' by Murchison in 1839. It also contains the species ''B. accraensis'', ''B. acuminata'', and ''B. noticus''. The type locality was the Bokkeveld Group. P.A. Jell and J.M. Adrain. References External links ''Burmeisteria'' at the |
Acaste
Acaste (; Ancient Greek: Ἀκάστη) was the name of two figures in Greek mythology. * Acaste, one of the Oceanids. She was among the companions of Persephone when Persephone was abducted by Hades. * Acaste, the nurse of the daughters of king Adrastus of Argos.Parada, s.v. Acaste 2; Statius, ''Thebaid'1.529 Notes References * Hesiod, ''Theogony'', in ''The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White'', Cambridge, Massachusetts, Harvard University Press; London, William Heinemann Ltd. 1914Online version at the Perseus Digital Library * ''Homeric Hymn'' 2 ''to Demeter'', in ''The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White'', Cambridge, Massachusetts, Harvard University Press; London, William Heinemann Ltd. 1914Online version at the Perseus Digital Library * Parada, Carlos, ''Genealogical Guide to Greek Mythology'', Jonsered, Paul Åströms Förlag, 1993. . * Statius, ''Statius with an English Translation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Trilobite")