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Topic: Paleozoic Era


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In the News (Mon 15 Jul 19)

  
  Paleozoic - Wikipedia, the free encyclopedia
The Paleozoic is a major division of the geologic timescale, one of four geologic eras.
The Paleozoic covers the time from the first appearance of abundant, hard-shelled fossils to the time when the continents were beginning to be dominated by large, relatively sophisticated reptiles and relatively modern plants.
At the start of the era, life was confined to bacteria, algae, sponges and a variety of somewhat enigmatic forms known collectively as the Ediacarian fauna.
en.wikipedia.org /wiki/Paleozoic   (455 words)

  
 Paleozoic era. The Columbia Encyclopedia, Sixth Edition. 2001-05
During the hiatus between the late Precambrian and Paleozoic eras most of the evidence of the earth’s early history was destroyed by erosion.
In North America, the era began with submerged geosynclines, or downward thrusts of the earth’s crust, along the eastern, southeastern, and western sides of the continent, while the interior was dry land.
During the early part of the era, the area of exposed Precambrian, or shield, rocks in central Canada were eroding, supplying sediment to the geosynclines from the interior.
www.bartleby.com /65/pa/Paleozoi.html   (446 words)

  
 The Paleozoic Era
The Paleozoic is bracketed by two of the most important events in the history of animal life.
During the Paleozoic there were six major continental land masses; each of these consisted of different parts of the modern continents.
The most noteworthy feature of Paleozoic life is the sudden appearance of nearly all of the invertebrate animal phyla in great abundance at the beginning of the Cambrian period.
www.science501.com /PTPaleozoic.html   (795 words)

  
 Life of the Paleozoic Era   (Site not responding. Last check: 2007-10-20)
The "Cambrian fauna" typified the Cambrian oceans; although members of most phyla were present during the Cambrian, the seas were dominated by trilobites, inarticulate brachiopods, monoplacophoran molluscs, hyolithids, "small shelly fossils" of uncertain systematic posiiton, and archaeocyathids.
Later Paleozoic seas were dominated by crinoid and blastoid echinoderms, articulate brachiopods, graptolites, and tabulate and rugose corals.
By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape.
www.ucmp.berkeley.edu /paleozoic/paleozoiclife.html   (262 words)

  
 Palaeos Paleozoic: The Paleozoic Era
For most of the Paleozoic, Greenland remained close to the equator and, after Baltica sutured to Laurentia (North America plus Greenland) during the Silurian, this longitude came to correspond quite closely to the longitude of the future Greenwich, England, which defines the present conventional 0° longitude line.
The early Paleozoic saw many of the continents clustered around the equator, with Gondwana (representing the bulk of old Rodinia) slowly drifting south across the South poles, and Siberia, Laurentia (North America plus Greenland) and Baltica converging in the tropics.
The Early Paleozoic climate was also strongly zonal, with the result that the "climate", in an abstract sense became warmer, but the living space of most organisms of the time -- the continental shelf marine environment -- became steadily colder.
www.palaeos.com /Paleozoic/Paleozoic.htm   (1615 words)

  
 Evolution
At the beginning of the Paleozoic Era, there were already living organisms on the earth.
The Paleozoic oceans swarmed with primitive arthropods called trilobytes (relatives of the horseshoe crab).
The end of the Paleozoic Era is the Permian Period, sometimes called the "Age of Amphibians" Amphibians and reptiles are the dominant fauna and gymnosperms the dominant plant life.
www.horseshoecrab.org /evo/paleo/paleo.html   (269 words)

  
 Milwaukee Public Museum Paleozoic Era   (Site not responding. Last check: 2007-10-20)
Paleozoic means "old animal life" and the Paleozoic Era is characterized by fossils of extinct types of animals.
Fish appeared in the early Paleozoic, and amphibians and reptiles, the first vertebrates to live on land, appeared late in the era.
The end of the Paleozoic Era is marked by a mass extinction.
www.mpm.edu /collect/geology/Paleo.html   (85 words)

  
 The Palaeozoic Era.
The Palaeozoic Era spans 322 million years, beginning with the Cambrian period 570 million years ago, and finishing with the end of the Permian period 248 million years ago.
It is the longest period of the Palaeozoic era.
It is the earliest period of the Palaeozoic era.
www.bobainsworth.com /fossil/palaeozoic.htm   (870 words)

  
 MSN Encarta - Search Results - Paleozoic Era
Paleozoic Era, major division of geological time, preceded by Precambrian time and followed by the Mesozoic Era, and including the Cambrian,...
The Paleozoic era lasted about 330 million years.
In the Paleozoic era (about 570 million to 240 million years ago), large parts of Canada were covered by shallow seas.
encarta.msn.com /Paleozoic_Era.html   (124 words)

  
 Earth Floor: Geologic Time
So much happened during the Paleozoic that it is divided into seven geologic time periods, shown on the red steps of the "Staircase of Time." Many different things happened during each period, but we can only give a summary of them here.
The Paleozoic was also marked by several mass extinctions: geologically short periods of time during which large numbers of life forms died out.
We can follow the development of life in detail during the Paleozoic, because at the beginning of that Era, life forms developed hard parts like shells, teeth, bones, and woody parts that were easily preserved as fossils.
www.cotf.edu /ete/modules/msese/earthsysflr/paleozoic.html   (648 words)

  
 Paleozoic era
and Paleozoic eras most of the evidence of the earth's early history was destroyed by erosion.
Table of Geological Periods - It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud,...
The rise and fall of rudist reefs: Reefs of the dinosaur era were dominated not by corals but by odd mollusks, which died off at the end of the Cretaceous from causes yet to be discovered.
www.infoplease.com /id/A0837345   (561 words)

  
 The Paleozoic Era   (Site not responding. Last check: 2007-10-20)
At its beginning, multicelled animals underwent a dramatic "explosion" in diversity, and almost all living animal phyla appeared within a few millions of years.
Roughly halfway in between, animals, fungi, and plants alike colonized the land, the insects took to the air, and the limestone shown in this picture was deposited near Burlington, Missouri.
The Paleozoic Era occurs between the Proterozoic and the Mesozoic.
www.ucmp.berkeley.edu /paleozoic/paleozoic.html   (300 words)

  
 The Paleozoic Era   (Site not responding. Last check: 2007-10-20)
At first most organisms lived in the sea, but by the end of the Paleozoic, animals and plants were also well-developed on land.
Positions of the earth's continents in the Paleozoic were radically different from those of today.
Middle Paleozoic continental positions, shown in green, are compared with the modern position of continents in blue in the diagram above.
www.mpm.edu /research/geology/third/tp5.html   (94 words)

  
 Paleozoic Era   (Site not responding. Last check: 2007-10-20)
This apparently sudden expansion in the number of life forms in the fossil record is called the Cambrian Explosion, and it marks the beginning of the Paleozoic Era.
Most fossil organisms found in Paleozoic rocks are invertebrates (animals without a backbone), such as corals, mollusks (clams and snails), and trilobites (flat-shelled sea animals).
Toward the end of the Paleozoic Era, in rocks from the Permian Period, some fossil reptiles begin to show some characteristics of mammals.
www.worldbook.com /features/earth/html/paleozoic.htm   (453 words)

  
 The Paleozoic era (from Earth) --  Britannica Student Encyclopedia   (Site not responding. Last check: 2007-10-20)
The major divisions of the Paleozoic Era, from oldest to youngest, are the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.
The major divisions of the era, from oldest to youngest, are the Triassic, Jurassic, and Cretaceous periods.
Discussion of the end of the Warring States period, the imperial era, and the era of disunity.
www.britannica.com /ebi/article-199837   (944 words)

  
 Paleozoic Era --  Encyclopædia Britannica
The tectonic events in Asia of the Paleozoic Era (543 to 248 million years ago) may be summarized under three categories: events in the Altaids, events in the Tethysides, and events in the continental nuclei.
The identification of Asian Paleozoic tectonic events with those associated with the Caledonian and Hercynian orogenies of Europe, as was done in the older...
The Paleozoic Era consists of the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods and includes two major mountain-building episodes.
www.britannica.com /eb/article-9117441?tocId=9117441   (929 words)

  
 Paleozoic Era Paleobiology
The Paleozoic Era lasted from 544 to 245 million years ago, and is divided into six periods.
These 300 million years of the Paleozoic era realized many critical events in evolution, including the development of most invertebrate groups, life's conquest of land, the evolution of fish, reptiles, insects, and vascular plants, the formation of the supercontinent of Pangea.
Hence, the Paleozoic is sometimes called the age of trilobites.
www.fossilmuseum.net /Paleobiology/Paleozoic_paleobiology.htm   (1649 words)

  
 Comox Valley Earth Sciences Resource Site: Paleozoic Era   (Site not responding. Last check: 2007-10-20)
It also witnessed the evolution and world-wide distribution of the reptiles sometime during the Mississippian Period; the emergence of all the major plant groups, except for the angiosperms, by the close of the Pennsylvanian; and the debut of the mammal-like reptiles during the Permian.
However, by the close of the Permian Period, and with it the Paleozoic Era, the animal and plant communities suffered the greatest catastrophe in their long and diverse histories: mass extinction.
The Mississippian Period was a time of marked transition from the predominantly marine conditions of the early Paleozoic Era, to the carbon-rich coal swamps and forests whose remains are so characteristic of this interval in Europe and North America.
www.courtenaymuseum.ca /paleo/paleo/paleozob.html   (1012 words)

  
 ipedia.com: Mesozoic Article   (Site not responding. Last check: 2007-10-20)
Cenozoic Mesozoic Cretaceous Jurassic Triassic Paleozoic The Mesozoic is one of four geologic eras.
It followed the Paleozoic Era and preceded the Cenozoic Era.
During the Era, Pangaea split into the northern continent Laurasia and the southern continent Gondwana.
www.ipedia.com /mesozoic.html   (284 words)

  
 Additional Reading (from Paleozoic Era) --  Encyclopædia Britannica
Three eras are recognized: Paleozoic Era, Mesozoic Era, and Cenozoic Era.
It was the interval of time during which the continents assumed their modern configuration and geographic positions and during which the Earth's flora and fauna evolved toward those of the present.
The Paleozoic era, which began about 543 million years ago, lasted about 295 million years.
www.britannica.com /eb/article-69819?tocId=69819   (861 words)

  
 Trilobite Geological Time Scale   (Site not responding. Last check: 2007-10-20)
The Paleozoic portion of the geological scale of eras at the left is expanded on the right as geological periods, and the time scale indicates how many millions of years ago (mya) each period persisted.
Trilobites are one of the few major groups of organisms that existed from the start to the end of the Paleozoic Era.
Although trilobites are the signature organism of the Paleozoic, their peak diversity was in the early Paleozoic, and they began a general decline in the upper Paleozoic (despite bursts of adaptive radiations in the Ordovician, Silurian, and Devonian periods), and that ended with their extinction in the Late Permian.
www.trilobites.info /geotime.htm   (419 words)

  
 AllRefer.com - Paleozoic era (Geology And Oceanography) - Encyclopedia
You are here : AllRefer.com > Reference > Encyclopedia > Geology And Oceanography > Paleozoic era
Paleozoic era[pA´´lEuzO´ik] Pronunciation Key, a major division (era) of geologic time (see Geologic Timescale, table) occurring between 570 to 240 million years ago.
More articles from AllRefer Reference on Paleozoic era
reference.allrefer.com /encyclopedia/P/Paleozoi.html   (516 words)

  
 [No title]
~Devonian The Devonian is the fourth period of the Paleozoic Era.
~Ordovician *The Ordovician is the second period of the Paleozoic Era.
~Silurian The Silurian is the third period of the Paleozoic Era.
www.usd.edu /exam/backup/DP-10.txt   (2824 words)

  
 CVO Menu - The Geologic Time Scale
An era of geologic time from the beginning of the Tertiary period to the present.
An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic.
The second earliest period of the Paleozoic era.
vulcan.wr.usgs.gov /Glossary/geo_time_scale.html   (670 words)

  
 Palaeos Paleozoic: The Paleozoic Era - 2
The impact of Much Wenlock on paleontology lies partly in that early discovery and partly in the early opportunity it gave geologists to put together a the components of a fairly complete Paleozoic ecosystem.
For paleontologists, however, most of the interest is in the Red Bay and Early Devonian Wood Bay groups, both exposed in the relatively glacier-free center of the island.
At the time, and perhaps until just the last few years, this was the most complete reconstruction of a paleozoic vertebrate ever completed.
www.palaeos.com /Paleozoic/Paleozoic2.html   (2052 words)

  
 [No title]   (Site not responding. Last check: 2007-10-20)
~Age of Reptiles bThe Mesozoic Era is known as the "Age of Reptiles" because of the dinosaurs, pterosaurs, and marine reptiles that dominated the earth.
~Cambrian Explosion cThe Paleozoic Era began with the sudden appearance of many complex animals called the "Cambrian Explosion." ~Extinction of ammonoids bAmmonoids went extinct at the end of the Mesozoic Era ~Ironstones dIronstones, or banded iron formations, formed during the Precambrian where the atmosphere didn't have enough oxygen to fully oxidize the iron.
bAmphibians evolved from the lobe-fin bony fishes in the middle of the Paleozoic Era.
www.usd.edu /exam/esci/history.txt   (558 words)

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