|
Bashi Formation
The Bashi Formation is a geologic formation in Alabama and Mississippi. It is named for Bashi Creek in northern Clarke County, Alabama, which cuts through some of its exposures. It preserves fossils dating back to the Eocene period, or Wasatchian in the NALMA classification.Bashi Formation at .org Fossil content The following fossils have been reported from the formation: ;Reptiles * '' Palaeophis cf. littoralis''Parmley & Case, 1988 * ''[...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 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 W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dasyatis Tricuspidatus
''Dasyatis'' ( Greek δασύς ''dasýs'' meaning rough or dense and βατίς ''batís'' meaning skate) is a genus of stingray in the family Dasyatidae that is native to the Atlantic, including the Mediterranean. In a 2016 taxonomic revision, many of the species formerly assigned to ''Dasyatis'' were reassigned to other genera ('' Bathytoshia'', '' Fontitrygon'', '' Hemitrygon'', ''Hypanus'', '' Megatrygon'' and '' Telatrygon''). Species *'' Dasyatis dipterura'' ( D. S. Jordan & C. H. Gilbert, 1880) (diamond stingray) *'' Dasyatis chrysonota'' A. Smith, 1828 (blue stingray) *'' Dasyatis hypostigma'' H. R. S. Santos & M. R. de Carvalho, 2004 (groovebelly stingray) *'' Dasyatis marmorata'' Steindachner, 1892 (marbled stingray) *'' Dasyatis pastinaca'' Linnaeus, 1758 (common stingray) *'' Dasyatis tortonesei'' Capapé, 1975 (Tortonese's stingray) Fossil species *† A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote if an as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontaspis Borodini
''Odontaspis'' (from el, ὀδούς 'tooth') and el, ἀσπίς 'shield') is a genus of sand shark with two extant species. Description Bigeye sand tigers can reach a length of about and smalltooth sand tigers of about 4.1 m. They are large-bodied sharks with long, conical snouts, broad-based dorsal and anal fins, and an asymmetrical caudal fin with a strong lower lobe. Their teeth are large, with prominent narrow cusps. They are distinguished from the similar genus ''Carcharias'' by the absence of crushing posterior teeth.Bourdon, J''Odontaspis'' Agassiz 1838 ''Elasmo.com''. Retrieved on December 24, 2008. These bottom dwelling, deepwater sharks can be found in temperate and tropical waters of all the oceans. Extant species * ''Odontaspis ferox'' ( A. Risso, 1810) (smalltooth sand tiger) * ''Odontaspis noronhai'' ( Maul, 1955) (bigeye sand tiger) Extinct species Extinct species within this genus include: * ''Odontaspis aculeatus'' Capetta & Case, 1975 * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretolamna Lerichei
''Cretalamna'' is a genus of extinct otodontid shark that lived from the latest Early Cretaceous to Eocene epoch (about 103 to 46 million years ago). It is considered by many to be the ancestor of the largest sharks to have ever lived, '' Otodus angustidens'', '' Otodus chubutensis'', and '' Otodus megalodon''. Taxonomy Research History ''Cretalamna'' was first described by Swiss naturalist Louis Agassiz using five teeth previously identified as the common smooth-hound and collected by English paleontologist Gideon Mantell from the Southerham Grey Pit near Lewes, East Sussex. In his 1835 publication ''Rapport sur les poissons fossiles découverts en Angleterre'', he reidentified them as a new species of porbeagle shark under the taxon ''Lamna appendiculata''. In 1843, Agassiz published ''Recherches sur les poissons fossiles'', which reexamined Mantell's five teeth. Using them, eight additional teeth collected by Mantell, and twenty more teeth collected by various paleontologis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anomotodon Sp
''Anomotodon'' is an extinct genus of shark related to the extant goblin shark (''Mitsukurina owstoni''). The distribution of ''Anomotodon'' fossils is worldwide, in formations indicating that members of the genus lived from the Early Cretaceous epoch through the Eocene epoch, and perhaps through the Oligocene as well. Described species include ''A. novus'', ''A. plicatus'', ''A. principalis'', and ''A. multidenticula''. See also *''Scapanorhynchus ''Scapanorhynchus'' (from el, σκάφιου , 'shovel' and el, ῥύγχος 'snout') is an extinct genus of shark that lived from the early Cretaceous until possibly the Miocene if ''S. subulatus'' is a mitsukurinid and not a sand shark.Capet ...'' References Further reading * * * Mitsukurinidae Cretaceous sharks Paleocene sharks Eocene sharks Prehistoric fish of Asia Shark genera Taxa named by Camille Arambourg Fossil taxa described in 1952 Prehistoric cartilaginous fish genera {{Cretaceous-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Striatolamia Macrota
''Striatolamia'' is an extinct genus of sharks belonging to the family Odontaspididae. These extinct sharks lived from the Early Paleocene to Late Miocene (61.7 to 10.3 Ma). Etymology The Latin genus name ''Striatolamia'' refers to the striations on the surface of the teeth. Taxonomy This genus had been assigned to families Mitsukurinidae and Striatolamiidae by other authors.Jim BourdoStriatolamia - The Life and Times of Long Dead Sharks/ref> Similar and related genera include ''Carcharoides'', '' Parodontaspis'', '' Priodontaspis'', '' Pseudoisurus'' and '' Synodontaspis''. Species Species within this genus include: * ''Striatolamia macrota'' Agassiz 1843 * ''Striatolamia striata'' (Winkler 1874) * ''Striatolamia whitei'' (Arambourg, 1952) Description ''Striatolamia'' species could reach a length of about . Its teeth are notably big and rather common in sediments. The anterior teeth have elongated crowns, with striations on the lingual face and small lateral cusplet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhinobatos Sp
''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatus'', '' Glaucostegus'', and '' Pseudobatos''. Species The 15 currently recognized species in this genus are: * '' Rhinobatos albomaculatus'' Norman, 1930 (White-spotted guitarfish) * '' Rhinobatos annandalei'' Norman, 1926 (Annandale's guitarfish) * '' Rhinobatos borneensis'' Last, Séret & Naylor, 2016 (Borneo guitarfish) * '' Rhinobatos holcorhynchus'' Norman, 1922 (Slender guitarfish) * '' Rhinobatos hynnicephalus'' J. Richardson, 1846 (Ringstreaked guitarfish) * '' Rhinobatos irvinei'' Norman, 1931 (Spineback guitarfish) * '' Rhinobatos jimbaranensis'' Last, W. T. White & Fahmi, 2006 (Jimbaran shovelnose ray) * '' Rhinobatos lionotus'' Norman, 1926 (Smoothback guitarfish) * '' Rhinobatos nudidorsalis'' Last, Compagno & Nakaya, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platyrhina Dockeryi
''Platyrhina'' is a genus of rays in the family Platyrhinidae, containing three species. They are native to the warm-temperate to tropical marine waters in the western Pacific Ocean. They are little-known bottom-dwellers that feed on small invertebrates such as crustaceans, molluscs, and worms. The fanray is found inshore to a depth of 60 m on rocky or rock sandy bottoms. ''Platyrhina'' species have rounded, heart-shaped pectoral fin discs with short, blunt snouts. Their tails are long and shark-like, slightly flattened with lateral ridges. The two dorsal fins and the caudal fin are large and rounded; the caudal fin lacks a lower lobe. The teeth are small and arranged in pavement-like rows for crushing shelled prey. Their bodies are covered with minute dermal denticles; also, several rows of denticles are located inside the buccopharyngeal cavity. The shape of these denticles in ''Platyrhina'' and the similar ''Platyrhinoidis'' distinguish them from all other guitar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Bashi Formation")
_(7267243878).jpg "Click for more on -> Cretolamna Lerichei")
