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Topic: Cambrian


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In the News (Mon 10 Dec 18)

  
  Palaeos Paleozoic: Cambrian: The Cambrian Period - 1
Laurentia stretched across the Cambrian equator, partly submerged by the Iapetus ocean, with a mostly mostly submerged Baltica and Siberia approaching from the South-East.
During the 53 million years that the Cambrian period lasted there was the sudden appearance and diversification of almost every major group (phylum) of animal life, as well as many types that later died out.
The most characteristic animals of the Cambrian period were the trilobites, a primitive form of arthropod remarkable for it's highly developed eyes (unusual in such an early organism).
www.palaeos.com /Paleozoic/Cambrian/Cambrian.htm   (2818 words)

  
  Cambrian system - LoveToKnow 1911
The Cambrian system is covered by his stages "B" and "C"; the former a barren series of conglomerates and quartzites, the latter a series of grey and green fissile shales 1200 ft. thick with sandstones, greywackes and conglomerates.
The Cambrian system is represented in the Salt Range of India by the Neobolus or Khussack beds, which may possibly belong to the middle subdivision.
No Cambrian rocks are such as would be formed in the abysses of the sea - although the absence of well-developed eyes in the trilobites has led some to assume that this condition was an indication that the creatures lived in abyssal depths.
www.1911encyclopedia.org /Cambrian_system   (2844 words)

  
  Cambrian - Wikipedia, the free encyclopedia
The Cambrian is a major division of the geologic timescale that begins about 542 mya (million years ago) at the end of the Proterozoic eon and ended about 488.3 mya with the beginning of the Ordovician period (ICS, 2004).
The lower boundary of the Cambrian was traditionally set at the earliest appearance of early arthropods known as trilobites and of primitive reef-forming animals known as archeocyathids.
Cambrian continents are thought to have resulted from the breakup of a Neoproterozoic supercontinent called Pannotia.
en.wikipedia.org /wiki/Cambrian   (1104 words)

  
 Cambrian explosion - Wikipedia, the free encyclopedia
The Cambrian explosion has proved to be difficult to study, partly because of the problems involved in matching up rocks of the same age across continents.
Given that Cambrian animals are often large, sometimes had hard parts and could evidently make very abundant and obvious benthic trace fossils, their hypothesised Proterozoic predecessors could probably have none of these attributes without leaving at least some reasonable, or even obvious, trace in the fossil record.
The rapidity of the Cambrian explosion, the lack of precursors in the fossil record, and the apparent bewildering diversity of the forms displayed by the exceptional faunas, has generated much interest from many students of evolution, including most recently from the field of “Evo-Devo”.
en.wikipedia.org /wiki/Cambrian_explosion   (3648 words)

  
 The Geology of Ohio--The Cambrian
As the Cambrian sea continued to flood the long-emergent craton during the opening of the Iapetus Ocean, the waters deepened across Ohio and carbonate deposition began in eastern Ohio as the Rome Formation, which is primarily dolomite, accumulated.
Traditionally, the Cambrian is known as the Age of Trilobites because these arthropods constitute perhaps 60 percent of the fossils known from this system and have proved to be wonderful index fossils for comparative dating and correlation of rock units.
Although Ohio's Cambrian rocks constitute the least well known Paleozoic system in the state because they are nowhere exposed at the surface, our knowledge of them is increasing rapidly because of intensive exploration and drilling activities for hydrocarbons and their suitability for disposal of liquid industrial wastes.
www.dnr.state.oh.us /geosurvey/oh_geol/97_winter/cambrian.htm   (3015 words)

  
 Cambrian HSU NHM
The Cambrian* Period begins the Phanerozoic Eon, the last 542 million years during which fossils with hard parts have existed, is the first division of the Paleozoic Era (251 - 542mya).
Cambrian animals were organized into a unique marine fauna, one of three recognized during the Phanerozoic.
A relatively common Cambrian fossil is the brachiopod.
www.humboldt.edu /~natmus/lifeThroughTime/Cambrian.web/index.html   (705 words)

  
 Cambrian Summary
Numerous Cambrian reefs, patch reefs, and shallow-water mounds were formed by stromatolites, a layered mass of sediment formed by the daily trapping and binding action of a symbiotic growth of blue-green algae and bacteria.
The Cambrian is a major division of the geologic timescale that begins about 542 mya (million years ago) at the end of the Proterozoic eon and ended about 488.3 Ma with the beginning of the Ordovician period (ICS, 2004).
The lower boundary of the Cambrian was traditionally set at the earliest appearance of early arthropods known as trilobites and of primitive reef-forming animals known as archeocyathids.
www.bookrags.com /Cambrian   (2583 words)

  
 CC300: Cambrian Explosion
The Cambrian explosion was the seemingly sudden appearance of a variety of complex animals about 540 million years ago (Mya), but it was not the origin of complex life.
The length of the Cambrian explosion is ambiguous and uncertain, but five to ten million years is a reasonable estimate; some say the explosion spans forty million years or more, starting about 553 million years ago.
A "snowball earth" before the Cambrian explosion may have hindered development of complexity or kept populations down so that fossils would be too rare to expect to find today.
www.talkorigins.org /indexcc/CC/CC300.html   (1162 words)

  
 Cambrian Period
The Cambrian Period is the first period of the Paleozoic Era spanning from approximately 540 to 500 million years ago.
Rocks of Cambrian age are distributed in the Great Basin (the largest desert in the US) of the western United States, parts of the northeastern United States, Wales, Scandinavia and the Baltic region, Siberia, and China, among other places.
The most characteristic animals of the Cambrian period were the trilobites, a primitive form of arthropod remarkable for it's highly developed eyes (unusual in such an early organism) and their exoskeletons of chitin.
www.denison.edu /biology/bio380-2001/Cambrian.html   (1269 words)

  
 Evolution: Library: The Cambrian Explosion
This stunning and unique evolutionary flowering is termed the "Cambrian explosion," taking the name of the geological age in whose early part it occurred.
Recent research suggests that the period prior to the Cambrian explosion saw the gradual evolution of a "genetic tool kit" of genes that govern developmental processes.
Once the body plans that proved most successful came to dominate the biosphere, evolution never had such a free hand again, and evolutionary change was limited to relatively minor tinkering with the body plans that already existed.
www.pbs.org /wgbh/evolution/library/03/4/l_034_02.html   (824 words)

  
 Cambrian Associates - Independent Financial Advisers - info@cambrian-associates.co.uk
Cambrian Associates Limited is authorised to conduct investment business under the Financial Services and Markets Act 2000 and it is regulated by the Financial Services Authority.
Cambrian Associates Limited is an independent adviser and will act on your behalf in advising you on life assurance, pensions and investments from different companies.
Cambrian Associates Limited offers independent advice, but occasions can arise where we or one of other our clients will have some form of interest in business being transacted for you.
www.cambrian-associates.co.uk /legal.php   (1022 words)

  
 GeoFacts No. 20, The Geology of Ohio--The Cambrian
Were it not for this dramatic occurrence, the 65-million-year-long Cambrian Period would not be regarded as the beginning of a new, and perhaps the most significant, era in the history of the Earth.
As the Cambrian sea continued to flood the craton during the opening of the Iapetus Ocean, the waters deepened across Ohio, and carbonate deposition began in eastern Ohio as the Rome Formation accumulated.
Traditionally, the Cambrian is known as the Age of Trilobites because these arthropods constitute perhaps 60 percent of the fossils known from this system.
www.ohiodnr.com /geosurvey/geo_fact/geo_f20.htm   (1568 words)

  
 Life During the Cambrian Period
Finally, the Cambrian saw the appearance and/or diversification of mineralized algae of various types, such as the coralline red algae and the dasyclad green algae.
Cambrian echinoderms were predominantly unfamiliar and strange-looking types such as early edrioasteroids, eocrinoids, and helicoplacoids.
And while jawless vertebrates were present in the Cambrian, it was not until the Ordovician that armored fish became common enough to leave a rich fossil record.
www.ucmp.berkeley.edu /cambrian/camblife.html   (571 words)

  
 The Cambrian Period
The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups of animals first appear in the fossil record.
It was once thought that the Cambrian rocks contained the first and oldest fossil animals, but these are now to be found in the earlier Vendian strata.
The Cambrian Period is part of the Paleozoic Era.
www.ucmp.berkeley.edu /cambrian/camb.html   (272 words)

  
 McCann & Cambrian E-Media Services - Web Hosting & Design
McCann and Cambrian is happy to welcome this creative organization to its on line family.
McCann and Cambrian was pleased to develop such a site and is pleased to provide complete web hosting services on behalf of the organization.
John puts a huge emphasis on the beauty and nature of the outdoors creating portraits for people who are interested in using the natural beauty of the area as a backdrop for their special day or event.
www.cambrianhosting.com   (1261 words)

  
 Cambrian Times
It was a hot time at the Camden Community Center on Saturday, Oct. 27 when chili cooks gathered to show off their culinary skills.
Kiwanis Clubs from Cambrian Park, Willow Glen and South San Jose celebrated their second annual chili cookoff and barbecue.
There was plenty of information and veterinarian Dr. David Reed of the Bascom Animal Hospital was on hand for low-cost shots, clipping and nail clipping services as well as providing information on the care Read more...
www.cambriantimes.com   (240 words)

  
 Cambrian House - This is a developer site.
Cambrian House - This is a developer site.
If you're not a developer, you probably want to leave.
Why not head over to Cambrian House's main site.
developer.cambrianhouse.com   (50 words)

  
 Cambrian House, Home of Crowdsourcing
Can you confirm the following information is real (or at least filled in)?
National Viking Association, Cambrian House, Home of Crowdsourcing
Become an owner in the world's first crowdsourcing community.
www.cambrianhouse.com   (282 words)

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