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Topic: Palaeozoic

	Palaeozoic - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-21)
		The Palaeozoic is a major division of the geologic timescale, one of four geologic eras.
		The Palaeozoic includes six geologic periods; from oldest to youngest -- the Cambrian, Ordovician, Silurian, Devonian, Carboniferous (Mississippian and Pennsylvanian in North America), and Permian.
		The Palaeozoic 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.
	encyclopedia.worldsearch.com /palaeozoic.htm (521 words)

	Paleozoic - Wikipedia, the free encyclopedia
		Geologically, the Paleozoic starts shortly after the breakup of a supercontinent called Rodinia and at the end of a global ice age.
		Throughout the early Palaeozoic, the Earth's landmass was broken up into a substantial number of relatively small continents.
		Toward the end of the era, the continents gathered together into a supercontinent called Pangea, which included most of the Earth's land area.
	en.wikipedia.org /wiki/Palaeozoic (455 words)

	GYMNOSPERMS - LoveToKnow Article on GYMNOSPERMS (Site not responding. Last check: 2007-10-21)
		The Gymnosperms, with the Angiosperms, constitute the existing groups of seed-bearing plants or Phanerogams: the importance of the seed as a distinguishing feature in the plant kingdom may be emphasized by the use of the designation Spermophyta for these two groups, in contrast to the Pteridophyta and Bryophyta in which true seeds are unknown.
		Palaeozoic genera, has not entirely disappeared from the stems of modern cycarls; but the mesarch bundle is now confined to the leaves and peduncles.
		Among Palaeozoic genera there are some which bear a close resemblance to the recent type in Geological the form of the leaves; and petrified Palaeozoic seeds, bisto,y.
	65.1911encyclopedia.org /G/GY/GYMNOSPERMS.htm (12444 words)

	PALAEOZOIC ERA - LoveToKnow Article on PALAEOZOIC ERA
		The precise line in the record of the rocks where th~ chronicle of the Palaeozoic era closes and that of the Mesozoic era opens as in more recent historical documentsis a matter for editorial caprice.
		Finally, the divisional time separating the Palaeozoic record from that of the Mesozoic was made to coincide with a great natural break or unconformity of the strata.
		The rocks of Palaeozoic age are mainly sandy and muddy sediments with a considerable development of limestone in places.
	www.1911encyclopedia.org /P/PA/PALAEOZOIC_ERA.htm (369 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)

	Museum Victoria [ed-online] Dinosaurs & Fossils - Diversification of life in the oceans (Site not responding. Last check: 2007-10-21)
		Corals were abundant during the Palaeozoic Era when they were represented by two groups: the rugose corals, which included forms that constructed colonies as well as solitary forms; and the tabulate corals, which were exclusively colonial.
		In the Palaeozoic the same groups were present, but the bivalves and gastropods were not as abundant or diverse as today, and the dominant cephalopods were the nautiloids which are now represented by only a single genus Nautilus with a restricted distribution.
		Bivalves had a variety of lifestyles in the Palaeozoic as they do today, burrowing into the sediment on the sea floor, attaching themselves to hard objects by strong threads or cementation of the shell, or in a few forms swimming by clapping their shells together.
	www.museum.vic.gov.au /dinosaurs/lifetime-oceans.html (2549 words)

	Palaeozoic
		The study of Palaeozoic vertebrates has long been an integral part of understanding the evolution and anatomy of the lower back-boned animals.
		However the use of Palaeozoic fishes in geological correlation's has also been long known, at least since the time of Hugh Miller, in the early nineteenth century, when Old Red Sandstone fish fossils were used to identify the same series of rocks, of approximately the same age, around different parts of Scotland.
		The focus of the chapters in this volume is largely on the new discoveries of Palaeozoic vertebrates in successions that are well-constrained by other Preface dating methods, and thus may be correlatable with either microfossil zonations or marine invertebrates and microfossil zonation schemes.
	www.users.globalnet.co.uk /~jimmiysf/palaeozo.htm (1364 words)

	Mark Wilson's Homepage - University of Alberta, Edmonton, Alberta, Canada (Site not responding. Last check: 2007-10-21)
		Pan-Arctic Palaeozoic Tectonics, Evolution of Basins and Faunas.
		Palaeozoic Strata and Fossils of the Eurasian Arctic.
		406 - Circum-Arctic Lower-Middle Palaeozoic Vertebrate Palaeontology and Biostratigraphy (1996-2000).
	www2.biology.ualberta.ca /wilson.hp/mvhw/publications.html (4632 words)

	Geology of Kent and the Boulonnais
		The Palaeozoic rocks of the Boulonnais belong to two separate tectonic units, the western extensions of the Dinant Synclinorium to the south and the Namur Synclinorium to the north, respectively.
		In contrast, the middle Devonian rocks of the Namur Synclinorium rest on folded Lower Palaeozoic rocks that were tectonised during the Caledonian Orogeny and overlie the Precambrian core of the Brabant Massif.
		From the limited borehole evidence, it is inferred that east Kent and the Boulonnais occupied an area of shelf to intermediate depth seas situated to the east of a landmass of low relief during the Ordovician and Silurian.
	www.geologyshop.co.uk /geolkb.htm (14969 words)

	Yourgroup:Fossil Groups: SciComms 03-04: Earth Sciences (Site not responding. Last check: 2007-10-21)
		The fossil record of echinoids in the Palaeozoic is relatively sparse: fewer than 40 genera are known.
		Palaeozoic echinoids differ from post-Palaeozoic forms in having a flexible (as opposed to rigid) test.
		By the end of the Palaeozoic all perisoechinoids had become extinct and only one cidaroid genus, Miocidaris, is known to have crossed the Permo-Triassic boundary.
	palaeo.gly.bris.ac.uk /Palaeofiles/Fossilgroups/Echinoidea/page4.html (385 words)

	Palaeozoic Palaeobotany of Great Britain
		This book covers the first 200 million years of the history of land evolution, showing how the main facets of vegetative evolution can be demonstrated at sites in Britain, and how the fossil record can be of value as an evolutionary and environmental indicator of the geological past, in general, as well as in Britain.
		The Palaeozoic Era was a time of major evolution and diversification of plants, as they adapted from aquatic to terrestrial habitats.
		Towards the end of the Palaeozoic (250 million years ago), a traumatic episode beset land plants and many of the previously dominant forms became extinct.
	www.jncc.gov.uk /page-2984 (290 words)

	PALAEOZOIC ERA - Online Information article about PALAEOZOIC ERA (Site not responding. Last check: 2007-10-21)
		sharp and clear to the earlier geologists are proved to be absent in other regions, and fossils which were formerly deemed characteristic of the Palaeozoic era are found in some places to commingle with forms of strongly marked Mesozoic type.
		The rocks of Palaeozoic age are mainly sandy and muddy sediments with a considerable development of See also:
		It is obvious from the advanced stage of development of the organisms found in the earliest of these Palaeozoic rocks that the beginnings of life must go much farther back, and indeed organic remains have been found in rocks older than the Cambrian; for convenience, therefore, the See also:
	encyclopedia.jrank.org /PAI_PAS/PALAEOZOIC_ERA.html (807 words)

	Tectonics of SW Bulgaria: general idea - Rhodope Geodynamic Hazards
		It is a polyphase (polymetamorphic and polydeformational) complex intruded by younger (Palaeozoic and Mesozoic) igneous rocks.
		The Palaeozoic section in the Morava Superunit consists of low-grade or very low-grade metasedimentary formations with palaeontologically proven Ordovician, Silurian and Devonian age.
		Palaeozoic rocks of the same age are present also in the basement of the Lyubash Unit.
	www.geology.bas.bg /rgh/tectswbulgaria.html (1923 words)

	Encyclopedia: Ozark
		A volcano (plural, volcanoes) is a geological landform (usually a mountain) where magma (rock of the earths interior made molten or liquid by high pressure and temperature) erupts through the surface of the planet.
		The core of the range existed as a island in the The Palaeozoic is a major division of the geologic timescale, one of four geologic eras.
		The Palaeozoic includes six geologic periods; from oldest to youngest -- the Cambrian, Ordovician, Silurian, Devonian, Carboniferous (Mississippian and...
	www.nationmaster.com /encyclopedia/Ozark (10541 words)

	Göteborg University, Earth Sciences Centre B6 (Site not responding. Last check: 2007-10-21)
		Geographical distribution of Palaeozoic rock fragments in Quaternary sediments in Southeast Sweden.- The question of westerly outliers of Palaeozoic rocks on the sub-Cambrian peneplain.
		The occurrence of saprolites of supposed Pliocene to Pleistocene age close to the same border, indicates that the sub-Cambrian peneplain in Southeast Sweden was exhumed during this time and subjected to moderate glacial erosion during the Quaternary.
		The combination between the fluvial appearance of the Alsterån valley and the occurrence of Lower Palaeozoic rock fragments in the Late Weichselian glacigenic sediments, suggests that the Alsterån valley is an exhumed primary valley lowered into the sub-Cambrian peneplain.
	www.gvc.gu.se /BIBLIO/B-serin/absB006.htm (217 words)

	PSIgate - Physical Sciences Information Gateway: Search/Browse Results (Site not responding. Last check: 2007-10-21)
		The stratigraphic record is dominated by Palaeozoic platform and shelf edge carbonates succeeded by Upper Permian to Triassic molasse siliciclastics that are locally present in depressions.
		The main goal of their investigations is to reconstruct the history of insects and evolution through morphological and cladistic analysis; the geological history of some orders (dragonflies and damselflies, mayflies, bugs, beetles, true flies, caddis flies, wasps, orthopterans, grylloblattids, stoneflies) has been traced comprehensively; palaeoecology is also one of the main research interests.
		Province history is that of a Palaeozoic, intracratonic, siliciclastic rift basin that evolved into a Miocene (Andean) foreland fold and thrust belt.
	www.psigate.ac.uk /roads/cgi-bin/psisearch.pl?term1=Palaeozoic&limit=0&subject=All (2325 words)

	Journal of the Geological Society: Testing models of Late Palaeozoic-Early Mesozoic orogeny in Western Turkey: support ...
		In Model 1, a Palaeozoic ocean subducted southwards, rifting continental fragments from Gondwana and opening a Triassic Neo-Tethys to the south.
		The Palaeozoic ocean was by then completely consumed and was replaced by Triassic oceanic crust further south.
		A Palaeozoic ocean (Palaco-Tcthys) opened along the northern margin of Gondwana and an elongate continental sliver (Hun composite terranc) drifted northwards until it collided with Eurasia during Carboniferous time (Stampfli et al.
	www.findarticles.com /p/articles/mi_qa3721/is_200405/ai_n9345834 (1370 words)

	Palaeozoic Palaeobotany - GCR block
		In contrast to the manner in which most invertebrate fossils are represented in the GCR, fossils of vertebrates, arthropods (except trilobites) and terrestrial plants do have their own dedicated GCR Blocks, because of the relative rarity of the fossil material.
		The Palaeozoic Era was a time of major evolution and diversification of plants, since most of the major morphological and anatomical strategies that allowed plants to take advantage of the terrestrial habitats appeared at this time as they adapted from aquatic to terrestrial habitats.
		Towards the end of the Palaeozoic Era (250 million years ago), a traumatic episode beset land plants and many of the previously dominant forms became extinct.
	www.jncc.gov.uk /earthheritage/gcrdb/GCRblock.asp?block=67 (474 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		EUROPROBE Neoproterozoic-Early Palaeozoic Time-Slice Symposium: Orogeny and Cratonic Response on the Margins of Baltica.
		Early Palaeozoic intracontinental rifting and early sea-floor spreading in the central West Sudetes (Bohemian Massif): geochemical and Sr-Nd isotopic study on metavolcanic rocks of the East Krkonoe Complex.
		Early palaeozoic siliclastic sediments of the Barrandian (Tepla-Barrandian terrane, Bohemian Massif): palaeotectonic implication.
	www.iach.cz /knav/a00/4846.htm (1028 words)

	Ultrastructure of Paleozoic rhabdopleurid hemichordates
		The Palaeozoic rhabdopleurids investigated are closer ultrastructurally to graptolites than to contemporary pterobranchs.
		Our SEM study examined the fine structure of the fusellar tissue of some Palaeozoic rhabdopleurids in order to verify Urbanek’s (1976a, b) claims that the characteristic ultrastructural fabric and pattern of rhabdopleurid skeletal tissue are invariable, have remained unchanged at least since the Ordovician, and are dissimilar to those of graptolites.
		The results of this SEM study of Palaeozoic rhabdopleurid pterobranchs are in sharp contrast with those of Urbanek’s (1976a, b) TEM studies.
	www.graptolite.home.pl /cagliostro (6515 words)

	The early Palaeozoic geological history of the Isle of Man (Site not responding. Last check: 2007-10-21)
		The Isle of Man lies close to the surface trace of one of the most important regional Palaeozoic structures - the Iapetus Suture - that separated the Avalonian continent to the south from the Laurentian continent to the north.
		It is surrounded by remnant sedimentary basins, one of which, the South East Irish Sea Basin, contains large amounts of gas and oil due to the presence of a prolific Carboniferous source rock and an excellent Triassic reservoir.
		The presence of the duplex means that the Lower Palaeozoic rocks have been divided into slices or tracts separated by faults.
	earth.leeds.ac.uk /ygs/programme/year1999/oct99.htm (1106 words)

	Paleoclimate \| Palaeoclimate \| Palaeozoic Climates
		During the early Palaeozoic, about 530Ma, the Northern Hemisphere was entirely oceanic north of about 30°N palaeolatitude.
		In general, variations in the preservation of marine carbonate species support the sea level/CO connection assumed for the Phanerozoic (Sandberg, 1983), and Fischer (1982) has correlated these variations (see Figure 5.2) to conjectured climate (greenhouse-icehouse) supercycles.
		In addition, the continental flooding associated with the early Palaeozoic marine transgression would increase the water surface area, thus reducing further the seasonality, and hence summer temperatures, of the polar region.
	www.global-climate-change.org.uk /5-2-2-1.php (682 words)

	Palaeozoic continent margins
		The faunal integrity of what are today the North American and European parts of Avalonia precludes the possibility that they represented more than one terrane in Lower Palaeozoic times, particularly when the terrane’s rapid movements over the latitudes during the Ordovician is considered.
		The terrane includes the Palaeozoic of the Korean peninsula, but the northern margin is somewhat arbitrary because of the absence of known Palaeozoic rocks from most of Manchuria.
		A number of terranes within today’s Himalayas were discrete elements in Palaeozoic times and include the Lhasa Terrane (south Tibet) and the Qiangtang Terrane (north Tibet).
	www.geodynamics.no /gmap/Methods/Continent_Outlines.htm (954 words)

	Hiking through the Palaeozoic (Site not responding. Last check: 2007-10-21)
		The rocks tell a story of constantly changing sedimentary environments brought forward by changes in climate and sea level and tectonic events that affected subsidence and uplift.
		In the Grand Canyon, the youngest rocks preserved are those from the Palaeozoic era, which lasted some 300 million years.
		This sequence of Palaeozoic rock formations (compare adjoining page) is responsible for the magnificent scenery in the Grand Canyon for two reasons:
	www.geoaktuelt.no /imaker?id=18705&a=14301&s=18704&m=-1 (907 words)

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