Asaphidae, a family of Upper Cambrian and Silurian Trilobites of which Asaphus is the type genus. (sacklunch.net)
The lower boundary of the Cambrian was originally held to represent the first appearance of complex life, represented by trilobites. (wikipedia.org)
The recognition of small shelly fossils before the first trilobites, and Ediacara biota substantially earlier, led to calls for a more precisely defined base to the Cambrian Period. (wikipedia.org)
Peltura is a genus of trilobites from the Upper Cambrian . (wikipedia.org)
Trilobites first appeared in the Upper Cambrian period, about 500 million years ago. (ampyx.org.uk)
Daguinaspis was among the earliest defined genera of Cambrian trilobites that were based on Moroccan material. (company.site)
The eyes of trilobites (lower Cambrian to Upper Permian) are often very well preserved, and the structure and physiology of their calcite lenses, and the eye as a whole, are summarised here, based upon recent literature. (uni-koeln.de)
this represents the ancestral kind, first found in lowermost Cambrian trilobites. (uni-koeln.de)
Shale3
It is notable that the trilobite fauna of the Burgess Shale, being a late Middle Cambrian locality, is not dominated by Redlichiida as at Chengjiang, but by a mix of Ptychopariida, Corynexochida, and Agnostida. (trilobites.info)
However, in the Lower Cambrian shales, such as the shale in Xiuwu basin, the hydrothermal silica occupied a large proportion [ 13 , 14 ]. (hindawi.com)
Although the massively developed reverse faults in the complex geological structure areas outside the basin damaged the sealing property of the whole reservoir and induced the hydrocarbon loss and nitrogen entry [ 7 ], China Geological Survey firstly discovered that the Sinian and Cambrian systems in these areas also obtained high-yielding industrial shale gas airflow [ 6 ]. (hindawi.com)
Formation8
The upper part of the Martin Point section spans the upper Martin Point Member (upper Furongian, ~90 m) of the Green Point Formation of the Cow Head Group. (mun.ca)
Acritarchs from the Duolbagáisá Formation (Cambrian Series 2-Miaolingian) on the Digermulen Peninsula, Finnmark, Arctic Norway: towards a high-resolution Cambrian chronostratigraphy. (uit.no)
The overall assemblage is most comparable, in terms of composition, to Small skeletal fossil (SSF) assemblages from the early Cambrian Chengjiang fauna recovered from the Yu'anshan Formation in eastern Yunnan Province. (ku.edu)
The existing position that the Guojiaba Formation is correlated with Stage 3 in Cambrian Series 2 is strongly upheld based on the fossil assemblage recovered in this study. (ku.edu)
Since 1943 the anomalous contact in the Dyle-Thyle area between the Lower Cambrian Tubize Formation and older deposits, on the one hand, and the Upper Cambrian Mousty Formation and younger deposits, on the other hand, has been interpreted as a gently N-dipping, large-displacement thrust, the Orne-Noirmont-Baudecet thrust. (ac.be)
Limestone deposits used for cement manufacture range from the very old, such as the Precambrian and Cambrian Limestones of South Australia and the Upper Ordovician Lindsay Formation on the north shore of Lake Ontario in Canada, to the very recent, such as the shell sands which have been exploited as cement raw material from coastal areas such as San Francisco Bay, Iceland and Western Australia. (cemnet.com)
The distribution areas of the Tuessal Formation, the Lower and Middle Cambrian clinoform complex, as well as the areas of the Upper Riphean Formations reaching the Prevendian erosion surface are contoured. (geors.ru)
Stratigraphy3
The International Commission on Stratigraphy lists the Cambrian Period as beginning at 538.8 million years ago and ending at 485.4 million years ago. (wikipedia.org)
Stratigraphy of the upper Precambrian and Phanerozoic territories of Western Yakutia that are of interest in relation to the petroleum potential. (geors.ru)
Upper Precambrian and Lower Cambrian stratigraphy of the Olenek Uplift. (geors.ru)
Devonian1
Such eyes are confined to the single suborder Phacopina (Lower Ordovician to Upper Devonian). (uni-koeln.de)
Precambrian2
There are also rocks of Upper Precambrian, Ordovician and Silurian age. (showcaves.com)
Structure of the Precambrian and Cambrian deposits in the Northeast of the Siberian platform. (geors.ru)
Explosion2
The rapid diversification of lifeforms in the Cambrian, known as the Cambrian explosion, produced the first representatives of all modern animal phyla. (wikipedia.org)
This window on the diversity of the upper middle Cambrian fueled debates regarding the "Cambrian Explosion" and the origins of phylum-level diversity. (trilobites.info)
Sedimentary6
The Cambrian is unique in its unusually high proportion of lagerstätte sedimentary deposits, sites of exceptional preservation where "soft" parts of organisms are preserved as well as their more resistant shells. (wikipedia.org)
The sedimentary formations at the Recheira Mine belong to the Upper Cambrian to the Pre-Cambrian, with ages between 541 and 485 Ma. (showcaves.com)
Throughout this tract, middle and upper Cambrian sedimentary rocks and associated intrusions comprise the solid geology. (geologywales.co.uk)
The Horst itself is a fault-bounded block over which further, older, Cambrian sedimentary rocks outcrop. (geologywales.co.uk)
This GIS dataset is one of a collection of shapefiles representing part of Chapter 8 of the Atlas, Middle Cambrian to Lower Ordovician Strata of the Western Canada Sedimentary Basin, Figure 21c, Upper Cambrian - Lower Ordovician Lithology Shale. (canada.ca)
The velocity characteristics of the Upper Proterozoic-Phanerozoic sedimentary cover of the Anabar-Olenek region were studied, in particular, the bimodal character of the distribution interval P-wave velocities was established. (geors.ru)
Chengjiang2
Hou & Bergström, 1997: Arthropods of the Lower Cambrian Chengjiang fauna, southwest China. (fossilmuseum.net)
A report of the eyes of Cambrian arthropods from different Lagerstatten, especially the compound and median arthropod eyes from the Chengjiang fauna of China, is given. (uni-koeln.de)
Silurian1
Asaphidae, a family of Upper Cambrian and Silurian. (sacklunch.net)
Ordovician4
The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago (mya) to the beginning of the Ordovician Period 485.4 mya. (wikipedia.org)
The Cambrian Period followed the Ediacaran Period and was followed by the Ordovician Period. (wikipedia.org)
Problematic sclerites are common in Cambrian rocks around the world, but much less so in those of the Ordovician. (bioone.org)
By the Upper Cambrian, the northern margin of Gondwana was open to the Proto-Tethys, leading to the deposition of a vast clastic-dominated sequence from the Cambro-Ordovician onwards. (gsi.ie)
Trilobite3
Trilobite zones allow biostratigraphic correlation in the Cambrian. (wikipedia.org)
1984. Exceptionally preserved non trilobite arthropods and Anomalocaris from the Middle Cambrian of Utah. (fossilmuseum.net)
The Upper Cambrian Trilobite Olenus at Andrarum, Sweden: a case of iterative evolution? (ku.dk)
Paleozoic1
Age: Cambrian, Early Paleozoic Era. (company.site)
Rocks2
The period was established as "Cambrian series" by Adam Sedgwick, who named it after Cambria, the Latin name for 'Cymru' (Wales), where Britain's Cambrian rocks are best exposed. (wikipedia.org)
Rocks of these epochs are referred to as belonging to the Lower, Middle, or Upper Cambrian. (wikipedia.org)
Uplift2
The two formations and eight members that constitute the Upper Cambrian in the Llano uplift of central Texas are described or redefined, and their lithic characters in 19 measured sections are graphically summarized. (usgs.gov)
It normally averages about 580 feet thick and ranges from 540 to 610 feet thick, but in the southeastern corner of the Llano uplift truncation of the upper beds has reduced it to 360 feet. (usgs.gov)
Sediments2
Its initial sediments were deposited on a submerged pre-Cambrian terrane having a known topographic relief as great as 800 feet. (usgs.gov)
Structural characteristics of Vendian-Cambrian sediments within the North Tunguska OGR using seismic 2D data in connection with petroleum potential. (geors.ru)
Harlech1
The upper section of the Cambrian Coast railway closed between Harlech and Pwllheli in November 2013, shortly after the project commenced, so work to replace the structure could be conducted safely. (railtechnologymagazine.com)
Fossils2
The base of the Cambrian lies atop a complex assemblage of trace fossils known as the Treptichnus pedum assemblage. (wikipedia.org)
The use of Treptichnus pedum, a reference ichnofossil to mark the lower boundary of the Cambrian, is problematic because very similar trace fossils belonging to the Treptichnids group are found well below T. pedum in Namibia, Spain and Newfoundland, and possibly in the western US. (wikipedia.org)
Geology1
Because of their appearance during the Cambrian period (named, you may guess, after Wales) they are emblematic of Welsh geology. (ampyx.org.uk)
Fauna1
The Cambrian marked a profound change in life on Earth: prior to the Cambrian, the majority of living organisms on the whole were small, unicellular and simple (Ediacaran fauna and earlier Tonian Huainan biota being notable exceptions). (wikipedia.org)
Ediacaran2
Scratch circles from the Ediacaran and Cambrian of Arctic Norway and the Republic of South Africa, with a review of scratch circle ocurrences. (uit.no)
Carbonates in the upper Ediacaran of the Digermulen Peninsula, Arctic Norway. (uit.no)
Stratigraphic1
From the perspective of seismic stratigraphic and seismic facies analysis, the Cambrian, Vendian, and Riphean intervals of the section were examined in detail. (geors.ru)
2014). Lower-Middle Cambrian reef barrier in the northern Siberian platform as a target of primary exploration for oil and gas. (geors.ru)
Series1
The Cambrian is divided into four epochs (series) and ten ages (stages). (wikipedia.org)
Lower1
The Cambrian is divided into several regional faunal stages of which the Russian-Kazakhian system is most used in international parlance: *Most Russian paleontologists define the lower boundary of the Cambrian at the base of the Tommotian Stage, characterized by diversification and global distribution of organisms with mineral skeletons and the appearance of the first Archaeocyath bioherms. (wikipedia.org)
South China1
2012. Three head-larvae of Hesslandona angustata (Phosphatocopida, Crustacea) from the Upper Cambrian of western Hunan, South China and the phylogeny of Crustacea. (morphobank.org)
Complex1
Complex, multicellular organisms gradually became more common in the millions of years immediately preceding the Cambrian, but it was not until this period that mineralized - hence readily fossilized - organisms became common. (wikipedia.org)
Analysis1
Phylogenetic analysis has supported the view that before the Cambrian radiation, in the Cryogenian or Tonian, animals (metazoans) evolved monophyletically from a single common ancestor: flagellated colonial protists similar to modern choanoflagellates. (wikipedia.org)
China1
Numerous plectronocerid nautiloids appear in the Upper Cambrian of China. (palass.org)
Canada1
Made in Canada, CAMBRIAN combines heritage styling with extensive proprietary technology - offering an experience as unique as every glacier. (baffin.com)
Coast1
With the project complete trains are now able to run along the entire Cambrian Coast Line for the first time since late 2013. (railtechnologymagazine.com)