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Sella Formation
The Sella Formation is a Dapingian to Darriwilian geologic formation of southern Bolivia. The grey to green bioturbated siltstones interbedded with thin sandstone layers bear lenticular shell beds. Other parts of the formation contain yellow-green limy shales and grey sandy limestones. Coquinas often fill gutter casts and included brachiopods, trilobites, bivalves and nautiloids. The sediments were deposited in an open marine environment. at .org The species '' Coxiconchia sellaensis'' was named after the formation. Fossil content The formation has provided the follo ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 (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] |
Nautiloid
Nautiloids are a group of marine cephalopods ( Mollusca) which originated in the Late Cambrian and are represented today by the living ''Nautilus'' and '' Allonautilus''. Fossil nautiloids are diverse and speciose, with over 2,500 recorded species. They flourished during the early Paleozoic era, when they constituted the main predatory animals. Early in their evolution, nautiloids developed an extraordinary diversity of shell shapes, including coiled morphologies and giant straight-shelled forms (orthocones). Only a handful of rare coiled species, the nautiluses, survive to the present day. In a broad sense, "nautiloid" refers to a major cephalopod subclass or collection of subclasses (Nautiloidea ''sensu lato''). Nautiloids are typically considered one of three main groups of cephalopods, along with the extinct ammonoids (ammonites) and living coleoids (such as squid, octopus, and kin). While ammonoids and coleoids are monophyletic clades with exclusive ancestor-descendan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ribeiria
''Ribeiria'' is a genus of rostroconch mollusc with a pegma, once interpreted as an intermediate between helcionellids (such as ''Anabarella'' and ''Latouchella ''Latouchella'' is an extinct genus of marine invertebrate animal, that is considered to be a mollusk and which may be a sea snail, a gastropod. It is a helcionellid from the Tommotian epoch of what is now Siberia. Its tightly coiled, spiral ...'') and primitive scaphopods (such as '' Pinnocaris''). References Prehistoric mollusc genera Fossils of the Czech Republic Letná Formation Paleozoic life of Ontario Paleozoic life of Alberta Paleozoic life of Quebec {{paleo-mollusc-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Redonia
''Redonia'' is a genus of lichenized fungi in the family Caliciaceae. It contains the single species ''Redonia chilena'', a squamulose lichen. The type specimen was collected in Tarapacá, Chile, where it was found growing on calcareous soil. The genus was circumscribed in 1973 by Carroll William Dodge. The genus name honours Jorge Redón Figueroa, a Chilean lichenologist who collected the type. In his original circumscription of the genus, Dodge included the species ''Redonia cladocarpiza'' (transferred from ''Buellia ''Buellia'' is a genus of mostly lichen-forming fungi in the family Caliciaceae. The fungi are usually part of a crustose lichen. In this case, the lichen species is given the same name as the fungus. But members may also grow as parasites on l ...''), but this species is now known as '' Tetramelas cladocarpizus''. References Teloschistales Lichen genera Caliciales genera Taxa described in 1973 Taxa named by Carroll William Dodge {{Teloschist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pliomeridius
''Pliomeridius'' is an extinct genus of trilobite in the family Pliomeridae Pliomeridae is a family of phacopide trilobites, containing the following genera: *'' Anapliomera'' *'' Benedettia'' *'' Canningella'' *'' Colobinion'' *'' Coplacoparia'' *'' Cybelopsis'' *'' Ectenonotus'' *'' Encrinurella'' *'' Evropeites'' .... References Pliomeridae Articles created by Qbugbot {{Phacopida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
