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Sinsk Biota
The Sinsk Formation is a geologic formation in Central Siberia, Russia, exposed along the Lena River. It preserves fossils dating back to the Botomian stage of the Cambrian (corresponding to Cambrian Series 2). It notably contained the Sinsk Algal Lens, a Lagerstätte A Fossil-Lagerstätte (, from ''Lager'' 'storage, lair' '' Stätte'' 'place'; plural ''Lagerstätten'') is a sedimentary deposit that preserves an exceptionally high amount of palaeontological information. ''Konzentrat-Lagerstätten'' preserv ... which preserved some soft-bodied animals that would not typically be preserved as fossils. However, the Sinsk Algal Lens has largely been destroyed by commercial fossil collectors. Paleobiota After Ivantsov et al., 2005 Paleobiota See also * List of fossiliferous stratigraphic units in Russia References External links * Geologic formations of Russia Cambrian Asia {{Cambrian-stub ... [...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] |
Microdictyon
is an extinct genus of lobopodian worm characterized by its net-like sclerite armour plates, known from Cambrian deposits around the world. Soft-bodied fossils which preserve more than the sclerites are only known from the Chengjiang Lagerstätte of Yunnan, China. History ''Microdictyon'' sclerite plates have been recovered from around the globe, recovered from rock via acid dissolution which eats away at the rock but leaves behind compositionally distinct microfossils. The first of them were found in the '' Strenuella'' Limestone of Comley, England, in 1975. The genus ''Microdictyon'' was erected by Stefan Bengston, Vladimir Missarzhevsky, and S. C. Matthews in 1981, as an enigmatic net-like microfossil, based on a few isolated plates from South Kazakhstan, although this description lacked a type species and proper description, so a following publication by the same authors in 1986 corrected this. It was unknown at the time what animal could have produced it - suggestio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wiwaxia
''Wiwaxia'' is a genus of soft-bodied animals that were covered in carbonaceous scales and spines that protected it from predators. ''Wiwaxia'' fossils—mainly isolated scales, but sometimes complete, articulated fossils—are known from early Cambrian and middle Cambrian fossil deposits across the globe. The living animal would have measured up to when fully grown, although a range of juvenile specimens are known, the smallest being long. ''Wiwaxia'' affinity has been a matter of debate: Researchers were long split between two possibilities. On the one hand, its rows of scales looked superficially similar to certain scale worms (annelids); conversely, its mouthparts and general morphology suggested a relationship to the shell-less molluscs. More recently, evidence for a molluscan affinity has been accumulating, based on new details of ''Wiwaxia'' mouthparts, scales, and growth history. The name derives from Wiwaxy Peak in British Columbia. The proposed clade Halwaxiida con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nisusia
Kutorginates (Kutorginata) are an extinct class of early rhynchonelliform ("articulate") brachiopods. The class contains only a single order, Kutorginida (kutorginides). Kutorginides were among the earliest rhynchonelliforms, restricted to the lower-middle part of the Cambrian Period ("Atdabanian" tage 3to "Mayan" Miaolingian.html" ;"title="ate Miaolingian">ate Miaolingian. Despite this short span of time, kutorginides were still a major order of Cambrian rhynchonelliforms during the lower Cambrian. Kutorginide diversity was highest up to the "Toyonian", though they began to decline in the mid-Cambrian even as other brachiopod orders (particularly Orthida, orthides and Acrotretida, acrotretides) diversified. A similar pattern of diversity loss is seen in obollelides, naukatides, and chileides, three other early rhynchonelliform orders contemporary with kutorginides. Anatomy Kutorginides typically have a ventribiconvex shell (both valves convex, the ventral valve moreso) a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Botsfordia
Acrotheloidea is an extinct superfamily of discinid brachiopods, that lived from the Early Cambrian to Early Ordovician periods, c. 538 – 471 Ma. They are sometimes alternatively ascribed to the lingulids. There is evidence for an evolutionary transition through the genera ''Eoobolus'', ''Pustulobolus'', and ''Bostfordia'' to the Acrotretids. Acrotheloids have an apical foramen In dental anatomy, the apical foramen, literally translated "small opening of the apex," is the tooth's natural opening, found at the root's very tip—that is, the root apex — whereby an artery, vein, and nerve enter the tooth and commingle w .... References Prehistoric animal superfamilies Discinida {{paleo-protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
