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Topic: Silurian period

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	Silurian - LoveToKnow 1911
		The Silurian rocks may occur in close continuity with the upper Ordovician, as in S. Europe; or, as in the typical region, the Llandovery beds may rest unconformably upon older rocks; in N. America also there is a marked unconformity on this horizon.
		In a general sense the Silurian period was one of comparative quiescence as regards crustal disturbances, and a relative sinking of the land was followed by a relative elevation affecting wide areas in the N. hemisphere.
		Volcanic activity was quite subordinate in Silurian times; flows of diabase occurred at the commencement of the period in Bohemia, and evidence of minor basaltic flows and tuffs is found at Tortworth in Gloucestershire and at a few localities in N. America.
	www.1911encyclopedia.org /Silurian (1438 words)

	Silurian - Wikipedia, the free encyclopedia
		The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 Ma (million years ago), to the beginning of the Devonian period, about 416.0 Ma (ICS 2004).
		During the Silurian, Gondwana continued a slow southward drift to high southern latitudes, but there is evidence that the Silurian icecaps were less extensive than those of the late Ordovician glaciation.
		At the end of the Silurian, sea levels dropped again, leaving telltale basins of evaporites in a basin extending from Michigan to West Virginia, and the new mountain ranges were rapidly eroded.
	en.wikipedia.org /wiki/Silurian (895 words)

	SILURIAN PERIOD. The Columbia Encyclopedia: Sixth Edition. 2000 (Site not responding. Last check: 2007-10-24)
		The continents in the Silurian period remained much as they had been in the preceding Ordovician period, with approximately the same areas being subject to flooding by shallow seas.
		Dominating the life of the Silurian were marine invertebrates, including crinoids and cystoids, mollusks, and eurypterids, invertebrates related to crabs and insects.
		Also notable in the Silurian fauna were scorpions, possibly the first animals to live on land and take their oxygen from the air.
	www.bartleby.com /aol/65/si/Silurian.html (374 words)

	Ordovician - Wikipedia, the free encyclopedia
		The Ordovician period is the second of the six (seven in North America) periods of the Paleozoic era.
		Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, realized that they should be placed in a period of their own.
		By the end of the period, Gondwana had neared or approached the pole and was largely glaciated.
	en.wikipedia.org /wiki/Ordovician (983 words)

	Palaeos Paleozoic : Silurian : The Silurian Period
		Tropical reefs are common in the shallow seas of this period, formed by tabulate and rugose corals, stromatoporoid organisms, bryozoa and calcareous algae.
		A Silurian sea floor, showing numerous tabulate corals of the genus Favosites large Stromatoporoids, the "sunflower coral" (possibly a green alga) Ischadites, and rugose corals of the genera Entelophyllum, Kodonophyllum, Streptelasma and Craterophyllum.
		The eurypterids from the Upper Silurian of the Welsh Borderland may represent a previously undescribed, ontogenetically mixed, eurypterid assemblage, influenced by a series of facies changes; this is supported by sedimentological evidence (Manning, 1993).
	www.palaeos.com /Paleozoic/Silurian/Silurian.htm (1861 words)

	Silurian Period
		The earliest terrestrial body fossils are known from Silurian sediments: unassignable fragments from the Llandovery (Lower Silurian) age Tuscarora Formation in Pennslyvania, and identifiable arthropod fragments from the Late Silurian.
		Of the Silurian Fauna genera present during the Llandovery epoch, 78% also originated in that epoch, which demonstrates that extinctions were followed by a rapid post-extinction "rebound." However, once this Llandovery rebound was completed, standing diversity returned to and was maintained at pre-extinction amounts.
		Silurian and Devonian assemblages are superficially similar, dominated by Lichiida and Phacopida, the latter including the well-known Calymenina.
	www.peripatus.gen.nz /paleontology/Silurian.html (2624 words)

	The Silurian Period of the Paleozoic Era
		The Silurian Period was a time when the Earth underwent considerable changes that had important repercussions for the environment and life within it.
		By the Silurian period, a large portion of the Rodinian landmass had become fragmented, and those fragments migrated toward the equatorial region.
		The Silurian was a time for important events in the history of evolution, including many "firsts," that would prove highly consequential for the future of life on earth.
	www.science501.com /PTSilurian.html (822 words)

	Silurian Period , Kentucky Geological Survey
		Silurian rocks are exposed at the surface in the Knobs Region, which rings the Blue Grass Region.
		Silurian rocks are absent in the Blue Grass, but occur below the surface in other parts of Kentucky.
		All Silurian rocks found in Kentucky are marine and all the fossils are marine (sea-dwelling) invertebrates.
	www.uky.edu /KGS/fossils/silurian.htm (192 words)

	Ordovician Period
		The Ordovician Period is the second period of the Paleozoic Era.
		The fossil record of this period is amazingly intact in the Great Basin of California, Utah and Nevada and affords an almost unprecedented opportunity to learn about the conditions that favor innovation in biodiversity.
		The glaciation caused global temperatures to drop as the period progressed, and the world entered an ice age, although conditions remain mild and equitable in the tropics.
	www.peripatus.gen.nz /paleontology/Ordovician.html (2874 words)

	[No title]
		~Devonian The Devonian is the fourth period of the Paleozoic Era.
		~Silurian The Silurian is the third period of the Paleozoic Era.
		~Silurian In the Silurian Period the rugose and tabulate corals and the bryozoans began to be the primary structural reef formers.
	www.usd.edu /exam/backup/exam3.txt (2824 words)

	SUNY Brockport Department of Earth Sciences -- Silurian Period (Site not responding. Last check: 2007-10-24)
		In western New York, the Silurian Period is characterized as a time of geologic inactivity between the Taconic (late Middle Ordovician) and Acadian (Middle to Late Devonian) Orogenies.
		The Silurian Period Began approximately 430 million years ago and lasted about 20 million years and is the shortest period in the Paleozoic Era.
		This was the result of the closing of the proto-Atlantic sea known as the Iapetus Ocean and the subsequent collision with Baltica, or Northwestern Europe by the end of the Silurian Period.
	www.weather.brockport.edu /~jmassare/silurian/silurian.htm (363 words)

	The Palaeozoic Era.
		It is the longest period of the Palaeozoic era.
		The Carboniferous period is the time during which most of the world's coal deposits were laid down, the coal being formed from compressed layers of rotting vegetation.
		It is the earliest period of the Palaeozoic era.
	www.bobainsworth.com /fossil/palaeozoic.htm (870 words)

	Prehistoric Life - Silurian Period in Victoria. (Site not responding. Last check: 2007-10-24)
		In Victoria, rocks of Silurian age occur mostly in the central part of the state, in the Melbourne district and as far North as Heathcote.
		Eoactis stachi, from the Upper Silurian in excavations for the Melbourne Underground Rail Loop.
		Helicocrinus plumosus, from the Upper Silurian of the Melbourne suburb of West Brunswick.
	www.museum.vic.gov.au /prehistoric/fossils/silurian.html (129 words)

	Silurian Period - Search Results - MSN Encarta
		Silurian Period, third division of the Paleozoic Era of the geologic time scale, spanning an interval of 28 million years, from about 444 million to...
		Most of the early complex life forms of the Cambrian explosion lived in the sea.
		The most important evolutionary development of the Silurian period (435 million to 410 million years ago) was that of the first air-breathing animal,...
	encarta.msn.com /Silurian_Period.html (135 words)

	The Silurian Period: Plants Move Onto Land
		Like the periods that have come before, the Silurian is named for an ancient Celtic tribe that lived in Wales where the geologic evidence was found.
		The new life in the Silurian Period was the coral reef.
		There are a few fossils from the end of the Silurian Period that show us early insects lived among these mosses and made their own colonies.
	www.fossils-facts-and-finds.com /silurian_period.html (600 words)

	AllRefer.com - Silurian period (Geology And Oceanography) - Encyclopedia (Site not responding. Last check: 2007-10-24)
		Silurian period[siloor´Eun, sI–] Pronunciation Key [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.
		Three main series, based on the succession of strata in New York state, are usually distinguished : the lower Silurian (Medinan, or Alexandrian, series), the middle Silurian (Niagaran series), and the upper Silurian (Cayugan series).
		There were also desert conditions, under which the Salinan "red beds" of the Appalachian area and the salt deposits of New York, Michigan, Ontario, and Ohio were formed.
	reference.allrefer.com /encyclopedia/S/Silurian.html (501 words)

	The Silurian (Site not responding. Last check: 2007-10-24)
		But, during the Middle and Late Silurian, Siberia moved north, Laurentia headed southeast, and Gondwana continued to stretch from the Equator to the South Pole.
		By the end of the Silurian, the collision between eastern Laurentia and western Baltica closed the northern part of the Iapetus Ocean and resulted in the formation of a huge mountain range.
		Within the Silurian rocks, we find the first coral reefs, which were built by now extinct tabulate and rugose corals rather than the familiar stony corals of modern reefs.
	www.paleoportal.org /time_space/period.php?period_id=14 (1020 words)

	The Silurian
		The Silurian (443 to 417 million years ago) was a time when the Earth underwent considerable changes that had important repercussions for the environment and life within it.
		The Silurian Period is part of the Paleozoic Era.
		Don't miss The Virtual Silurian Reef at the Milwaukee Public Museum.
	www.ucmp.berkeley.edu /silurian/silurian.html (258 words)

	Silurian Period (Site not responding. Last check: 2007-10-24)
		The term Silurian was first used in the 1830s to describe a sequence of rocks in south Wales.
		The name Silurian was derived from the name of an ancient British tribe known as the Silures.
		These Silurian rocks were defined based on a particular type of fossil assemblage contained within them.
	www.watersheds.org /earth/gtime02c.htm (88 words)

	Highbeam Encyclopedia - Search Results for Silurian period (Site not responding. Last check: 2007-10-24)
		Silurian Period Whatever you're looking for you can get it on eBay.
		Silurian period SILURIAN PERIOD [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.
		It is subdivided into six periods, the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian (see each listed individually).
	www.encyclopedia.com /printable/43099.html (396 words)

	Silurian Period - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-24)
		Silurian Period, third oldest division of the Palaeozoic Era of the geological timescale, spanning an interval from about 448 to 422 million years...
		Life ventured on to land in the form of simple plants called psilophytes, with a vascular system for circulating...
		Devonian Period, fourth division of the Palaeozoic Era of the geological timescale, spanning an interval from about 422 to 359 million years ago, and...
	uk.encarta.msn.com /Silurian_Period.html (123 words)

	The Silurian Period (Site not responding. Last check: 2007-10-24)
		The developement of coralallowed new species of fishto form because it formed safe havensand a background to camophlage against.The Silurian was also called the Ageof Corals.
		Plant life in the Silurian changed drasticallyfrom the Ordovician.
		These are pictures of the world in the early Silurian (about 430mya).
	www.ddg.com /Lauren/geologicages/silurian.html (110 words)

	ENGLISH NATURE - Special Sites
		The time period covered by the Silurian documents the assembly of two continental elements and closure of the Iapetus Ocean to form the continental landmass from which the British Isles were later formed.
		During the Lower Silurian the land of central and south-eastern England gave way to a shallow shelf sea along its margins.
		The Middle Silurian was marked by marine incursion across much of England and the Upper Silurian by the closure of the Iapetus Ocean, establishment of terrestrial conditions in the north and rapid shallowing of the shelf sea in the Midlands, Welsh Borders and southern England.
	www.english-nature.org.uk /special/geological/sites/stratiperiod10.asp (342 words)

	HighBeam Encyclopedia - Silurian period (Site not responding. Last check: 2007-10-24)
		SILURIAN PERIOD [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.
		Find newspaper and magazine articles plus images and maps related to "Silurian period" at HighBeam.
		Sir Roderick Impey Murchison: (1792-1871) Pioneering Scottish geologist Roderick Murchison was instrumental in the identification and naming of several geological time periods.(Late Great Geographers #56)
	www.encyclopedia.com /html/S/Silurian.asp (554 words)

	Silurian Period - ENCYCLOPEDIA - The History Channel UK
		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
		The continents in the Silurian period remained much as they had been in the preceding Ordovician period
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	www.thehistorychannel.co.uk /site/search/search.php?word=Silurian (517 words)

	Silurian/Devonian Period--Oldest land animals (millipedes, wingless insects, and other arthropods)
		Short news story from January, 2004, describing the find of the fossil millipede, Pneumodesmus newmani, from Silurian rocks in Scotland, which is the oldest (428 million years old) known land animal.
		Short discussion (sometimes technical) of early land community ecology, which discusses the lack of herbivores, and how some early arthropods, such as millipedes, chose detritovory (eating detritus-dead plants) and others, such as scorpions, chose predatory niches.
		Picture of the oldest known scorpion fossil from the Silurian of New York.
	www.uky.edu /KGS/education/Silurian2.htm (635 words)

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