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Topic: Paleozoic

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  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)

 The Paleozoic Era
The Paleozoic is bracketed by two of the most important events in the history of animal life.
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.
Later Paleozoic seas were dominated by crinoid and blastoid echinoderms, articulate brachiopods, graptolites, and tabulate and rugose corals.
www.science501.com /PTPaleozoic.html   (795 words)

 ScienceDaily: Paleozoic
The Paleozoic Era is a major division of the geologic timescale, one of four geologic eras.
Paleozoic -- The Paleozoic Era is a major division of the geologic timescale, one of four geologic eras.
Pangaea -- Pangaea or Pangea is the name given to the supercontinent that existed during the Paleozoic and Mesozoic eras, before the process of plate tectonics separated each of the component continents into...
www.sciencedaily.com /encyclopedia/Paleozoic   (1462 words)

 Paleozoic Hydrocarbon Habitat in the Arabian Plate, by Abdulkader M. Afifi, #10075 (2004).
The Paleozoic section in Arabia was deposited along the continental margin of Gondwana in predominantly clastic environments that ranged from continental near the Arabian Shield to outer shelf in Iran and Syria.
The main challenges to exploration and development are: (1) the difficulties in seismic imaging of the Paleozoic section due to multiples, seismic transparency, and near-surface problems; (2) the prediction of porosity in the tight, deeply buried reservoirs; and (3) the hostile subsurface environments.
During the Paleozoic, the plate was affected by drift and rotation that resulted in changes from equatorial to high southern latitudes and back to equatorial (at the end of the Triassic), with two periods of glaciation (Figure 2).
www.searchanddiscovery.com /documents/2004/afifi02/index.htm   (1742 words)

Paleozoic rock lie beneath glacial deposits across much of southeastern Minnesota, from as far north as the Taylors Falls area, southwest to the Mankato area.
Paleozoic rocks are sedimentary, formed of particles of pre-existing rocks or minerals, or with a biogenic or chemical origin.
The Paleozoic bedrock of southeastern Minnesota was deeply eroded as large amounts of meltwater from glaciers to the north caused the ancient Mississippi, St Croix, and Minnesota Rivers and their tributaries to erode more deeply into their valleys.
www.geo.umn.edu /courses/1004/Spring99/handouts/7.html   (1787 words)

 Highbeam Encyclopedia - Search Results for Paleozoic   (Site not responding. Last check: 2007-10-12)
Paleozoic era, a major division (era) of geologic time (see Geologic Timescale, table) occurring between 570 to 240 million years ago.
Silurian period [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. Murchison], third period of the Paleozoic era of geologic time (see Geologic Timescale, table) lasting from 405 to 435 million years ago.
The style of Late Paleozoic deformation in the Antigonish Basin: an example from the Monks Head section, Antigonish, Nova Scotia.
www.encyclopedia.com /SearchResults.aspx?Q=Paleozoic&StartAt=11   (691 words)

 Geologic Time: The Paleozoic   (Site not responding. Last check: 2007-10-12)
The Paleozoic is the earliest era of the Phanerozoic.
The name Paleozoic means "ancient life", since it was during this era that Earth's environment became conducive to the spread of new, complex life forms.
The end of the Permian, which is the last period of the Paleozoic, was marked by a mass extinction brought about by a combination of events.
www.mnh.si.edu /anthro/humanorigins/faq/gt/paleozoic.htm   (315 words)

 Palaeos Paleozoic: Paleozoic benthos
The low-level Paleozoic benthos was dominated by fixed suspension feeders, mainly the brachiopods supported by the bryozoans and microcarnivores such as the rugose and tabulate corals.
By the mid-Ordovician, two major groups of anthozoans, the rugose and tabulate corals, were firmly established as microphages, although neither ever built substantial reef structures, lacking many of the adaptations, such as a basal plate, that helped the scleractinians to develop as the dominant reef-builders of the Modern fauna.
Only a shallow infauna was well developed in the Paleozoic fauna, although there were exceptions; it included bivalves, scaphopods, trilobites and crustaceans occupying depths of up to about 100 mm.
www.palaeos.com /Paleozoic/pzbenthic.html   (705 words)

 Freeman-Lynde GLY116 Paleozoic Life Questions
Articulate brachiopods are the dominant bivalve of the Modern Fauna; bivalved mollusks (clams, oysters) are the dominant bivalve of the Paleozoic Fauna.
The mass extinction at the end of the Paleozoic was probably the result of the breakup of Wegener's Pangea.
The mass extinctions at the end of the Paleozoic were the result of the breakup of Pangea II.
www.arches.uga.edu /~rfreeman/Paleozoic_life_questions.html   (3086 words)

 The Early Paleozoic
The Paleozoic is the first of three eras within the Phanerozoic Eon (the time of visible life).
While life originated during the Archean and increased in complexity during the earlier Proterozoic, the Paleozoic Era is marked by the spread of animals with hard preservable parts such as shells and exoskeletons.
Geologically, the Paleozoic is noted for the assembly of Pangaea, the world supercontinent proposed back in the 1912 book The Origin of Continents and Oceans by German meteorologist Alfred Wegener (1880-1930) as part of his continental drift hypothesis.
www.cartage.org.lb /en/themes/Sciences/Paleontology/Paleozoology/EarlyPaleozoic/EarlyPaleozoic.htm   (3988 words)

 CVO Website - Paleozoic   (Site not responding. Last check: 2007-10-12)
The Paleozoic Era is geologic time, from the end of the Precambrian to the beginning of the Mesozoic, spanning the time between 544 and 248 million years ago.
The word Paleozoic is from Greek and means "old life." The Paleozoic Era is commonly referred to as the "Age of Ancient Life".
A period of time in the Paleozoic era that includes the Pennsylvanian and Mississippian periods and extended from 360 to 286 million years ago.
vulcan.wr.usgs.gov /LivingWith/VolcanicPast/Notes/paleozoic.html   (253 words)

 Paleozoic Era Paleobiology
The Paleozoic (meaning "time of ancient life)" 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.
The Paleozoic was ended by the greatest mass extinction event in geologic history, the Permian/Triassic extinction, when some 95% of all marine species met extincttion.
www.fossilmuseum.net /Paleobiology/Paleozoic_paleobiology.htm   (2060 words)

 Distribution of Lower and Middle Paleozoic Rocks in Colorado
In contrast to the dominance of igneous and metamorphic rocks in the Precambrian rock record, sedimentary rocks characterized the Paleozoic Era in Colorado.
Paleozoic sedimentary rocks were deposited in, or adjacent to, relatively shallow seas that invaded the continent periodically through time.
This indicates that the distribution and character of the sediments being deposited in Colorado during the Paleozoic was strongly influenced by events thousands of miles away on the bottom of the oceans.
geosurvey.state.co.us /Default.aspx?tabid=428   (347 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.
Here in the Paleozoic, Earth's interior has cooled down to something like modern levels, so that volcanic activity is usually about as humanity experiences it: a few minor eruptions like Mount St. Helens each year, and major ones like Krakatoa every century or so.
The Paleozoic was also marked by several mass extinctions: geologically short periods of time during which large numbers of life forms died out.
www.cotf.edu /ete/modules/msese/earthsysflr/paleozoic.html   (648 words)

 Paleozoic - Wikipedia, the free encyclopedia
The Paleozoic Era (from the Greek palaio, "old" and zoion, "animals", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic eon.
The Paleozoic spanned from roughly 542 MYA to roughly 251 MYA (ICS, 2004), and is subdivided into six geologic periods; from oldest to youngest they are: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.
Geologically, the Paleozoic starts shortly after the breakup of a supercontinent called Pannotia and at the end of a global ice age.
en.wikipedia.org /wiki/Paleozoic   (423 words)

 Geological Time Information
Paleozoic means "ancient life." The Paleozoic Era dawned about 550 million years ago.
During the early Paleozoic Era (Cambrian, The oldest was the Cambrian, Ordovician, and Silurian Periods, a large continent, known as Gondwanaland, was situated ofver the southern polar region.
During the Paleozoic Era, fishes evolved from primitive jawless forms to complex bony types with lungs and specialized fins.
www.stonecompany.com /geotime/paleozoic.html   (486 words)

 The Paleozoic Era   (Site not responding. Last check: 2007-10-12)
Trilobites of many kinds swam in the Paleozoic seas, but many of the sea animals were immobile.
The latest appearance of trilobites and of seed ferns is in the latest Paleozoic (Permian period) rock.
At the end of the Paleozoic there was extensive uplift of mountains.
lilt.ics.hawaii.edu /belvedere/materials/Mass-Extinctions/Paleozoic.htm   (203 words)

 Paleozoic Summary
The onset of the Paleozoic Era is marked by the "Cambrian explosion,"; the sudden appearance of numerous fossils.
The Paleozoic Era spanned that period of geologic time during which the evolution of the first invertebrates, vertebrates, terrestrial (land-based) plants, bony fish, reptiles, insects, etc. took place.
The end of the Paleozoic Era (approximately 245 mya) marks the largest mass extinction of species in Earth's history.
www.bookrags.com /Paleozoic   (805 words)

 Paleozoic Life   (Site not responding. Last check: 2007-10-12)
Our discussion of Paleozoic life begins with an examination of the Cambrian Explosion and then looks at changes in the marine biosphere, including evolution of the fishes.
The middle Paleozoic is marked by another event that changed the face of the earth, the invasion of land by plants and animals.
The end of the Paleozoic is marked by the largest mass extinction recorded in the history of life.
www.es-designs.com /geol105/Topics/paleozoic.html   (250 words)

 Geology 150 - Climate Changes
During the Paleozoic, Africa, Arabia, Antarctica, Australia, South America, and India were joined to form a southern supercontinent named Gondwana.
This diagram suggests that although that atmospheric CO was lower in the early part of the Cambrian it may have been increasing by the end of the Cambrian (see diagram above).
Paleozoic communities that were dominated by sessile filter feeders were replaced by more mobile organisms and more predators.
earth.usc.edu /~geol150/evolution/paleozoic.html   (950 words)

 Paleobiology 4   (Site not responding. Last check: 2007-10-12)
The late Paleozoic, the subject of this chapter, saw the spread of plant life over the land surface and the emergence and diversification of amphibians and their descendants the reptiles as dominant animal life on land.
Their increasing abundance reflects changing climates at the close of the Paleozoic and may be related to an increase in drier habitats.
The end of the Permian, also the end of the Paleozoic era, was marked by the greatest extinction of the Phanerozoic eon.
www.estrellamountain.edu /faculty/farabee/biobk/BioBookPaleo4.html   (6474 words)

 Terrestrial Paleozoic Ecosystems
The Paleozoic was the time during which terrestrial ecosystems were organized and assembled.
Global provincialization of vegetation began during the Early Carboniferous and increased more or less continuously until the Permian, when it reached its Paleozoic maximum; this was perhaps the greatest provincialization known prior to the later Tertiary.
Because the plants were at the base of the major terrestrial radiation, they evolved increasing tolerances to demanding physical conditions and expanded the extent of the vegetated land surface.
www.kheper.net /evolution/biota/Paleozoic_terrestrial.html   (729 words)

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