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Zhuganpo Formation
The Zhuganpo Formation is a Triassic geologic unit found in southern China. It has historically been known as the Zhuganpo Member of the Falang Formation. A diverse fossil assemblage known as the Xingyi biota or Xingyi Fauna can be found in the upper part of the Zhuganpo Formation. Fossils of the Xingyi biota include articulated skeletons of marine reptiles, abundant fish, and a plentiful assortment of invertebrates indicating a Ladinian to Carnian age for the sediments of the formation. Paleobiota Invertebrates * Ammonites: '' Clionitites'' sp., '' Detoniceras'' sp., '' Haoceras xingyiense'', '' Parasturia'' sp., ''Protrachyceras'' sp., ''Ptychites'' sp., '' Sinomeginoceras'' (''S. wangi, S. xingyiense''), ''Trachyceras'' sp., '' Xenoprotrachyceras'' cf. ''primum'', '' Yangites densicostatus'', * Bivalves: ''Daonella'' sp. * Conodonts: '' Gladigondolella malayensis'', ''Metapolygnathus'' / '' Paragondolella'' / '' Quadralella'' (''Q.'' aff''. acuminatus, P. foliata, P. incli ... [...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 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] |
Metapolygnathus
''Metapolygnathus'' is an extinct genus of platform conodonts. Synonyms ''Mazzaella (conodont), Mazzaella'' is a new genus that also includes ''Metapolygnathus baloghi'' Kovacs (1977). Use in stratigraphy The top of the Carnian or the base of the Norian stages (Late Triassic) begin at the base of the conodont biozones of ''Metapolygnathus communisti'' and ''Metapolygnathus primitius''. A List of Global Boundary Stratotype Sections and Points, global reference profile for the base (a GSSP) had in 2009 not yet been appointed. References External links * * Conodont genera Late Triassic fish Triassic conodonts {{conodont-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conodont
Conodonts (Greek ''kōnos'', "cone", + ''odont'', "tooth") are an extinct group of agnathan (jawless) vertebrates resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements, which are usually found in isolation and are now called conodont elements. Knowledge about soft tissues remains limited. They existed in the world's oceans for over 300 million years, from the Cambrian to the beginning of the Jurassic. Conodont elements are widely used as index fossils, fossils used to define and identify geological periods. The animals are also called Conodontophora (conodont bearers) to avoid ambiguity. Discovery and understanding of conodonts The teeth-like fossils of the conodont were first discovered by Heinz Christian Pander and the results published in Saint Petersburg, Russia, in 1856. The name ''pander'' is commonly used in scientific names of conodonts. It was only in the early 1980s that the first fossil evidence of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daonella
''Daonella'' is a genus of oyster-like saltwater clams, marine bivalve mollusks which lived in the middle to late Triassic period. They are related to the genera '' Aparimella'' and '' Halobia''. Since they were ubiquitous in the Arctic, Tethys and Panthalassa Panthalassa, also known as the Panthalassic Ocean or Panthalassan Ocean (from Greek "all" and "sea"), was the superocean that surrounded the supercontinent Pangaea, the latest in a series of supercontinents in the history of Earth. During th ... seas, they are frequently used as index fossils in dating rocks to the Triassic period. However, the systematic classification of the ''Daonella'' is still an area of ongoing research. References Prehistoric bivalve genera Triassic bivalves Triassic animals of Asia Triassic animals of Europe Ostreida {{paleo-bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalvia
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estim ... that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bivalves have no head and they lack some usual molluscan organs, like the radula and the odontophore. They include the clams, oysters, Cockle (bivalve), cockles, mussels, scallops, and numerous other family (biology), families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into Ctenidium (mollusc), ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment, where they a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachyceras
''Trachyceras'' is a genus belonging to the extinct subclass of cephalopods known as ammonites. Specifically it belongs in the order Ceratitida. They are distributed in Afghanistan, Bosnia and Herzegovina, Canada, China, Germany, Hungary, India, Indonesia, Italy, the Russian Federation, Slovenia, United States. The family to which ''Trachyceras'' belongs, the Trachyceratidae The Trachyceratidae is an extinct family of ceratitid ammonoid cephalopods. The Trachyceratidae makes up part of the superfamily Trachyceratoidea along with such families as the Buchitidae, Distichitidae, Dronovitidae and Noridiscitidae. ..., has more or less involute, highly ornamented shells and ceratitic to ammonitic sutures. References ;Notes ;Bibliography * Trachyceratidae Triassic ammonites Carnian genera Fossils of British Columbia Fossils of China Fossils of Italy Fossils of Germany Fossils of India Molluscs described in 1869 Prehistoric cephalopod genera {{Ceratiti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
