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Cambrian Period

Cambrian period

Cambrian is the name given to a period of time in Earth's history (i.e., Cambrian Period), which spanned 570510 million years ago. The proper name Cambrian is also given to all the rocks that formed during that time (i.e., Cambrian System). In other words, the Cambrian System is the rock record of events that occurredand organisms that livedduring an interval of geological time called Cambrian Period. Cambrian is the initial period of the Paleozoic Era .

Cambrian is a name derived from the Roman name for Wales, which was Cambria. Wales was the original study location for sedimentary rock formed during this interval of Earth history. The term Cambrian was first used in 1835 by Professor Adam Sedgwick (17851873) of Cambridge University, who was studying the lower part of what was then called Transition strata (the oldest known sedimentary rocks ) in Wales. Sedgwick was working in the same general area as another prominent stratigrapher of the day, Roderick Merchison (17921871), whose focus was upon the overlying Silurian System. Merchison eventually showed that there was some overlap in the original concept of Sedgwick's Cambrian System and his own Silurian System, and ultimately advocated (c. 1852) that the Cambrian System was in fact part of the Silurian. It was not until a comprehensive study of the Cambrian-Silurian overlap problem produced the intervening Ordovician System (1879), that the Cambrian System was fully accepted by all geologists. Since their recognition and definition during the nineteenth century, Cambrian strata have been mapped on all the world's continents.

During Cambrian, the breakup of the supercontinent of Gondwana began with the separation of some landmasses including part of Asia and the ancient continents called Baltica and Laurentia (i.e., proto-North America). During its separation from the main Gondwana land mass, Laurentia had a collision with the southern end of what is now South America (specifically western Argentina), which resulted in some crustal deformation and mountain building. At this time, there was essentially a single world ocean, which is referred to as Panthalassa.

During most of Cambrian, global sea levels were at relatively high elevations as compared with most of the balance of Earth's history. The world's continents were mainly low-lying deserts and alluvial plains, and the rising Cambrian seain what is known as the Sauk transgressionencroached upon these areas, thus forming vast epicontinental seas . For example, during most of Cambrian, sea level was so high that an epicontinental sea covered North America except for a series of low islands running southwest-northeast along the elevated middle part of the continent (i.e., the Transcontinental Arch) and some parts of the low-lying Canadian cratonic shield region.

Cambrian was a time of rising global temperatures and Cambrian global climate ultimately became warmer than today. During Cambrian, there were essentially no polar or high-altitude glaciers . Further, there were no continents located at polar positions. The Cambrian Earth likely had more equitable climates than present because of the large amount of surficial seawater (approximately 85% or more, compared to approximately 70% at present) and lack of significant topographic relief . Winds were likely confined to rather well-defined belts, and there is good evidence of persistent trade winds preserved in vast cross-bedded Cambrian sandstones.

Cambrian life in the oceans was very plentiful, but rather primitive by modern standards. The transition of pre-Cambrian life forms (mainly soft-body impressions in rock) to Cambrian life (shell-bearing fossils and other fossils with hard parts) has been referred to as the "Cambrian explosion." This explosion is more apparent than real, as the main change was the advent of preservable hard parts and shells, which seem to suddenly appear at a level near the onset of Cambrian sedimentation . Cambrian faunas include some very unusual creatures that may represent extinct phyla of organisms or organisms so primitive that they are not easily assigned to extant phyla. The most famous of fossil localities with such Cambrian fossils is at Mount Wapta, British Columbia, Canada (i.e., Burgess Shale outcrops). In these strata, the earliest known chordate (spinal cord-bearing animal), Pikaia, was first found. Other marine creatures of Cambrian seas included the archaeocyathids and stromatoporoids (two extinct, sponge-like organisms that formed reefs), primitive sponges and corals, simple pelecypods and brachiopods (two kinds of bivalves), simple molluscs, primitive echinoderms and jawless fishes, nautiloids, and a diverse group of early arthropods (including many species of trilobites). Trilobites were particularly abundant and diverse, and over 600 genera of Cambrian trilobites are known. Some species of trilobites were the first organisms to develop complex eye structures. 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.

Cambrian life on land was probably quite limited. There is evidence that stromatolitic growth of blue-green algae and bacteria covered rocks and formed sediment layers at or near oceanic shorelines and lake margins. However, complex life forms are not found in Cambrian terrestrial sediments. It is possible that some arthropods may have lived partially or entirely upon land at this time, but this is speculative in the absence of fossil evidence. There were no land plants at this time, and thus Cambrian landscapes were at the mercy of wind and water erosion without any protection from vegetation. The minimal level of photosynthetic activity before and during Cambrian raised oxygen levels in Earth's atmosphere to approximately 10% of that found in the modern atmosphere.

The end of Cambrian came gradually with falling sea levels and the onset of slightly cooler global temperatures. During Late Cambrian, trilobite species became the first organisms known to experience widespread mass extinction. In several events during Late Cambrian, trilobite faunas were wiped out over vast areas for causes that are not completely understood. Reasons proposed for the mass extinctions include competition with other organisms and rapid shifts in global temperature and/or sea-level changes. Trilobites persisted into Late Paleozoic, but not as prominently as they did in Cambrian seas. Ordovician succeeded Cambrian life and conditions. During Ordovician, plant and animal life continued to diversify, tectonic activity began to be more extensive, and global climate change became more intensive.

See also Stratigraphy; Supercontinents

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Cambrian Period

Cambrian Period

The Cambrian period (570 million years ago) marks an extraordinary shift in the evolution of life. It ushers in the beginning of the Paleozoic Era (the age of ancient life).

Cambrian period and surrounding time periods.

Era Period Epoch Million Years Before Present
Paleozoic Permian 286
Pennsylvanian 320
Missipian 360
Devonian 408
Silurian 438
Ordovician 505
Cambrian 570

In the Precambrian, a three-billion-year period of evolutionary stasis, the dominant life-forms were prokaryotes (tiny one-celled bacteria) and blue-green algae, both of which thrived in the steaming waters and nitrogen-and sulfur-rich air of a geologically turbulent Earth. Prokaryotes are the simplest forms of life, undifferentiated cells with no nucleus that reproduce by fission, the splitting of the parent cell into two. Prokaryotes live off hydrogen, sulfur, and nitrogen and they release free oxygen as a waste product. The prokaryotes' leisurely existence continued for five-sixths of recorded time, during which their massive colonies of cyanobacteria, fossilized as stromatilites, bubbled out enough oxygen to form eventually an atmosphere and a corresponding ozone shield against sterilizing ultraviolet radiation. This development appears to have set the stage for what has been described as the Big Bang of Biology, the Cambrian Explosion.

Cambrian rock is named after the Latin "Cambria," meaning Wales. It was there that Cambrian rock was first studied for fossils in the late 1800s. Since then it has been found on every continent, with a particularly fertile deposit having been discovered in British Columbia, Canada. The latter is known as the Burgess Shale , a fine-grained, mudstone siltstone rock unit only about 200 feet long and 8 feet thick. Stephen Jay Gould has described it as the most important fossil deposit ever found. Dating to the mid-Cambrian of about 520 million years ago, the Burgess Shale has more than 120 animal species represented in it. The Burgess fossils demonstrate that the Cambrian period was a riot of experimentation in size, shape, and abilities. Animals that swam, that burrowed, and that foraged appeared at this time. A huge diversity of forms emerged. Some would succeed and continue to exist, while many others would disappear forever. The beginnings of every existing major phyla of animals can be found in the Burgess Shale and in other layers of Cambrian rock in Greenland and China. Over 900 species of marine life have been discovered at these locations, including sponges, jellyfish, annelids, mollusks, arthropods, and chordates with rudimentary backbones. One of the most interesting innovations found in Cambrian period animals was their ability to secrete a mineralized skeleton.

What could have caused this remarkable outburst of evolutionary life? The single most galvanizing event of the late Precambrian was the appearance of eukaryota , life-forms that stored DNA in a nucleus and were capable of organizing bodies consisting of more than one cell. Eukaryotes allowed for the possibility of specialization, since the individual cells did not each have to perform every task as long as they could communicate chemically with one another. This cooperation between cells set life-forms free to explore every design and variable in size and shape imaginable. Eukaryotes also developed the capability for sexual reproduction, which increases genetic diversity. Rather than duplicating the genetic material exactly as simple fission does, sexual reproduction ensures that a constant shuffling of genetic material will maximize the number of mutations and variations possible. This again allows for radical divergences in the exploration of the environment. These advances in eukaryote organisms, combined with the new, oxygenated atmosphere of the planet, would appear to have allowed for the outburst of metazoansmulticelled animalsin the Cambrian rocks.

see also Geological Time Scale.

Nancy Weaver

Bibliography

Fortey, Richard. Fossils: The Key to the Past. Cambridge, MA: Harvard University Press, 1991.

Friday, Adrian, and David S. Ingram, eds. The Cambridge Encyclopedia of Life Sciences. London: Cambridge University Press, 1985.

Lambert, David. The Field Guide to Prehistoric Life. New York: Facts on File, 1985.

McLoughlan, John C. Synapsida: A New Look into the Origin of Mammals. New York: Viking Press, 1980.

Steele, Rodney, and Anthony Harvey, eds. The Encyclopedia of Prehistoric Life. New

York: McGraw Hill, 1979.

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Cambrian period

Cambrian period [Lat. Cambria=Wales], first period of the Paleozoic geologic era (see Geologic Timescale, table) extending from approximately 570 to 505 million years ago. It was named by the 19th-century English geologist Adam Sedgwick, who first studied the great sequence of rocks characteristic of the period near Cambria, Wales. During the Cambrian, the continents and seas differed from present day configurations. Four major continents, Gondwanaland, Angara, and the two sections of Euramerica, were inundated with a rising sea level, accumulating thick sedimentary deposits (see sediment). This sedimentary rock, i.e., conglomerate, sandstone, shale, and limestone, was formed in shallow seas that covered large areas of present-day North America, Europe, and Asia. In the United States, Lower Cambrian formations are found in the Appalachian; the sandstones near Waucoba Springs, S Calif.; and the thick layers of conglomerates and sandstones in Georgia, Tennessee, and North Carolina. Middle Cambrian rocks are found in New Brunswick, near Braintree, Mass. Upper Cambrian formations include the St. Croix sandstone of Wisconsin and the upper Mississippi valley, parts of the Arbuckle limestone of Oklahoma, and the Potsdam sandstone in New York's Adirondacks. In Russia, the Cambrian beds are remarkable in that they comprise mostly undisturbed and unconsolidated sand and clay despite their great age. The Cambrian rocks are the first rock layers to contain many easily recognizable fossils. The known Cambrian fauna—all marine—includes every phylum of invertebrates; the possibility that vertebrate fossils may be found cannot be excluded. The dominant animal was the trilobite, along with sea snails, brachiopods, sponges, and archaeocyathids. The ages of the various rock layers are distinguished according to the different genera of fossils they contain. The sudden appearance of highly developed and diversified fauna in Cambrian rock is best explained by the assumption that more primitive forms flourished during a missing stratigraphic interval between the close of the Precambrian and the beginning of the Cambrian. Remnants of these early organisms were either destroyed by erosion or their soft bodies easily decayed in a short period of time. In addition, at the beginning of the Cambrian, numerous animals eventually developed skeletons, or hard parts, capable of leaving behind fossil remains.

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Cambrian

Cambrian The earliest geological period of the Palaeozoic era. It is estimated to have begun about 570 million years ago and lasted for some 100 million years. During this period marine animals with mineralized shells made their first appearance and Cambrian rocks are the first to contain an abundance of fossils. Cambrian fossils are all of marine animals; they include trilobites, which dominated the Cambrian seas, echinoderms, brachiopods, molluscs, and primitive graptolites (from the mid Cambrian). Trace fossils also provide evidence for a variety of worms.

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Cambrian

Cambrian The first of six periods of the Palaeozoic Era, from about 570–510 Ma ago, during which sediments deposited include the first organisms with mineralized skeletons. Common fossils include Brachiopoda, Trilobitomorpha, Ostracoda, and, late in the period, Graptolithina. The plant fossils are mainly of algae and fungi. Trilobites (arthropods) are important in the stratigraphic subdivision of the period. See Burgess Shale.

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Cambrian

Cam·bri·an / ˈkambrēən; ˈkām-/ • adj. 1. (chiefly in names or geographical terms) Welsh. 2. Geol. of, relating to, or denoting the first period in the Paleozoic era, between the end of the Precambrian eon and the beginning of the Ordovician period. ∎  [as n.] (the Cambrian) the Cambrian period or the system of rocks deposited during it.

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Cambrian

Cambrian Earliest period of the Palaeozoic era, lasting from c. 590 million to 505 million years ago. Cambrian rocks are the earliest to preserve the hard parts of animals as fossils. They contain a large variety of fossils, including all the animal phyla, with the exception of the vertebrates. The commonest animal forms were trilobites, Brachiopoda, sponges and snails. Plant life consisted mainly of seaweeds.

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Cambrian

Cambrian The first of six periods of the Palaeozoic Era, which began about 570 Ma ago and ended about 510 Ma ago. Sediments deposited during the period include the first organisms with mineralized skeletons. Common fossils include brachiopods, trilobites, ostracods, and, late in the period, graptolites. Trilobites are important in the stratigraphic subdivision of the period.

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Cambrian

Cambrian The first of six periods of the Palaeozoic Era, from about 542–488.3 Ma ago, during which sediments deposited include the first organisms with mineralized skeletons. Common fossils include Brachiopoda, Trilobitomorpha, Ostracoda, and, late in the period, Graptolithina. Trilobites are important in the stratigraphic subdivision of the period.

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Cambrian

Cambrian The first of six periods of the Palaeozoic Era, from about 590–505 Ma ago, during which sediments deposited include the first organisms with mineralized skeletons. The plant fossils are mainly of algae and fungi. Trilobites (arthropods) are important in the stratigraphic subdivision of the period.

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Cambrian

Cambrian Welsh. XVII (preceded by Camber XVI). f. Cambria, var. of Cumbria, latinization of W. Cymru Wales :- OCelt. *Kombroges, f. *kom- together, COM- + *brog- border, region; see -IAN.

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Cambrian

Cambrianantipodean, Crimean, Judaean, Korean •Albion •Gambian, Zambian •lesbian •Arabian, Bessarabian, Fabian, gabion, Sabian, Swabian •amphibian, Libyan, Namibian •Sorbian •Danubian, Nubian •Colombian • Serbian • Nietzschean •Chadian, Trinidadian •Andean, Kandyan •guardian •Acadian, Akkadian, Arcadian, Barbadian, Canadian, circadian, Grenadian, Hadean, Orcadian, Palladian, radian, steradian •Archimedean, comedian, epicedian, median, tragedian •ascidian, Derridean, Dravidian, enchiridion, Euclidean, Floridian, Gideon, Lydian, meridian, Numidian, obsidian, Pisidian, quotidian, viridian •Amerindian, Indian •accordion, Edwardian •Cambodian, collodion, custodian, melodeon, nickelodeon, Odeon •Freudian • Bermudian • Burundian •Burgundian •Falstaffian, Halafian •Christadelphian, Delphian, Philadelphian •nymphean • ruffian • Brobdingnagian •Carolingian • Swedenborgian •logion, Muskogean •Jungian •magian, Pelagian •collegian •callipygian, Cantabrigian, Phrygian, Stygian •Merovingian • philologian • Fujian •Czechoslovakian • Pickwickian •Algonquian • Chomskian •Kentuckian •battalion, galleon, medallion, rapscallion, scallion •Anglian, ganglion •Heraklion •Dalian, Malian, Somalian •Chellean, Machiavellian, Orwellian, Sabellian, Trevelyan, triskelion •Wesleyan •alien, Australian, bacchanalian, Castalian, Deucalion, episcopalian, Hegelian, madrigalian, mammalian, Pygmalion, Salian, saturnalian, sesquipedalian, tatterdemalion, Thessalian, Westphalian •anthelion, Aristotelian, Aurelian, carnelian, chameleon, Karelian, Mendelian, Mephistophelian, Pelion, Sahelian •Abbevillian, Azilian, Brazilian, caecilian, Castilian, Chilean, Churchillian, civilian, cotillion, crocodilian, epyllion, Gillian, Lilian, Maximilian, Pamphylian, pavilion, postilion, Quintilian, reptilian, Sicilian, Tamilian, vaudevillian, vermilion, Virgilian •Aeolian, Anatolian, Eolian, Jolyon, Mongolian, napoleon, simoleon •Acheulian, Boolean, cerulean, Friulian, Julian, Julien •bullion •mullion, scullion, Tertullian •Liverpudlian •Bahamian, Bamian, Damian, Mesopotamian, Samian •anthemion, Bohemian •Endymion, prosimian, Simeon, simian •isthmian • antinomian •Permian, vermian •Oceanian •Albanian, Azanian, Iranian, Jordanian, Lithuanian, Mauritanian, Mediterranean, Panamanian, Pennsylvanian, Pomeranian, Romanian, Ruritanian, Sassanian, subterranean, Tasmanian, Transylvanian, Tripolitanian, Turanian, Ukrainian, Vulcanian •Armenian, Athenian, Fenian, Magdalenian, Mycenaean (US Mycenean), Slovenian, Tyrrhenian •Argentinian, Arminian, Augustinian, Carthaginian, Darwinian, dominion, Guinean, Justinian, Ninian, Palestinian, Sardinian, Virginian •epilimnion, hypolimnion •Bosnian •Bornean, Californian, Capricornian •Aberdonian, Amazonian, Apollonian, Babylonian, Baconian, Bostonian, Caledonian, Catalonian, Chalcedonian, Ciceronian, Devonian, draconian, Estonian, Etonian, gorgonian, Ionian, Johnsonian, Laconian, Macedonian, Miltonian, Newtonian, Oregonian, Oxonian, Patagonian, Plutonian, Tennysonian, Tobagonian, Washingtonian •Cameroonian, communion, Mancunian, Neptunian, Réunion, union •Hibernian, Saturnian •Campion, champion, Grampian, rampion, tampion •thespian • Mississippian • Olympian •Crispian •Scorpian, scorpion •cornucopian, dystopian, Ethiopian, Salopian, subtopian, Utopian •Guadeloupian •Carian, carrion, clarion, Marian •Calabrian, Cantabrian •Cambrian • Bactrian •Lancastrian, Zoroastrian •Alexandrian • Maharashtrian •equestrian, pedestrian •agrarian, antiquarian, apiarian, Aquarian, Arian, Aryan, authoritarian, barbarian, Bavarian, Bulgarian, Caesarean (US Cesarean), centenarian, communitarian, contrarian, Darien, disciplinarian, egalitarian, equalitarian, establishmentarian, fruitarian, Gibraltarian, grammarian, Hanoverian, humanitarian, Hungarian, latitudinarian, libertarian, librarian, majoritarian, millenarian, necessarian, necessitarian, nonagenarian, octogenarian, ovarian, Parian, parliamentarian, planarian, predestinarian, prelapsarian, proletarian, quadragenarian, quinquagenarian, quodlibetarian, Rastafarian, riparian, rosarian, Rotarian, sabbatarian, Sagittarian, sanitarian, Sauveterrian, sectarian, seminarian, septuagenarian, sexagenarian, topiarian, totalitarian, Trinitarian, ubiquitarian, Unitarian, utilitarian, valetudinarian, vegetarian, veterinarian, vulgarian •Adrian, Hadrian •Assyrian, Illyrian, Syrian, Tyrian •morion • Austrian •Dorian, Ecuadorean, historian, Hyperborean, Nestorian, oratorian, praetorian (US pretorian), salutatorian, Salvadorean, Singaporean, stentorian, Taurean, valedictorian, Victorian •Ugrian • Zarathustrian •Cumbrian, Northumbrian, Umbrian •Algerian, Cancerian, Chaucerian, Cimmerian, criterion, Hesperian, Hitlerian, Hyperion, Iberian, Liberian, Nigerian, Presbyterian, Shakespearean, Siberian, Spenserian, Sumerian, valerian, Wagnerian, Zairean •Arthurian, Ben-Gurion, centurion, durian, holothurian, Khachaturian, Ligurian, Missourian, Silurian, tellurian •Circassian, Parnassian •halcyon • Capsian • Hessian •Albigensian, Waldensian •Dacian • Keatsian •Cilician, Galician, Lycian, Mysian, Odyssean •Leibnizian • Piscean • Ossian •Gaussian • Joycean • Andalusian •Mercian • Appalachian • Decian •Ordovician, Priscian •Lucian •himation, Montserratian •Atlantean, Dantean, Kantian •bastion, Erastian, Sebastian •Mozartian • Brechtian • Thyestean •Fortean • Faustian • protean •Djiboutian •fustian, Procrustean •Gilbertian, Goethean, nemertean •pantheon •Hogarthian, Parthian •Lethean, Promethean •Pythian • Corinthian • Scythian •Lothian, Midlothian •Latvian • Yugoslavian •avian, Batavian, Flavian, Moldavian, Moravian, Octavian, Scandinavian, Shavian •Bolivian, Maldivian, oblivion, Vivian •Chekhovian, Harrovian, Jovian, Pavlovian •alluvion, antediluvian, diluvian, Peruvian •Servian • Malawian • Zimbabwean •Abkhazian • Dickensian •Caucasian, Malaysian, Rabelaisian •Keynesian •Belizean, Cartesian, Indonesian, Milesian, Salesian, Silesian •Elysian, Frisian, Parisian, Tunisian •Holmesian •Carthusian, Malthusian, Venusian

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"Cambrian." Oxford Dictionary of Rhymes. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

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"Cambrian." Oxford Dictionary of Rhymes. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cambrian