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Topic: Devonian

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Devonian period

Late Devonian extinction

Silurian

Ordovician

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Phacops rana

Pterichthys

Palaeozoic

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	Devonian - Wikipedia, the free encyclopedia
		The Devonian is a geologic period of the Paleozoic era.
		The paleogeography was dominated by the supercontinent of Gondwana to the south, the continent of Siberia to the north, and the early formation of the small supercontinent of Euramerica in the middle.
		The continent Euramerica (or Laurussia) was created in the early Devonian by the collision of Laurentia and Baltica, which rotated into the natural dry zone along the Tropic of Capricorn, which is formed as much in Paleozoic times as nowadays by the convergence of two great airmasses, the Hadley cell and the Ferrel cell.
	en.wikipedia.org /wiki/Devonian (1117 words)

	USGS Professional Paper 1151-H: The Geology of Kentucky: Devonian System
		Westward, in the Illinois basin, the subsurface Devonian section thickens to 1,800 ft; the upper 470 ft is shale, and the remainder is limestone and dolomite (data extrapolated from Collinson and Atherton, 1975, p.
		The erosion that preceded the Middle Devonian accumulation of carbonate rocks took place during an interval of mild tectonic warping along structures such as the incipient Cincinnati arch and the tighter folds that parallel or are normal to the present strike of the Appalachian Valley and Ridge province and the Pine Mountain thrust fault.
		Devonian chert and clay (Dcc).-Weathered Chattanooga Shale and chert and clay residue of the underlying Middle and Lower Devonian limestone is exposed in faulted localities in Marshall and Lyon Counties in western Kentucky (area 5, fig.
	pubs.usgs.gov /prof/p1151h/devonian.html (2402 words)

	DEVONIAN PERIOD. The Columbia Encyclopedia: Sixth Edition. 2000 (Site not responding. Last check: 2007-10-21)
		The Devonian period in Europe was marked by considerable volcanic activity and the deposition of two great rock systems: the marine formation of Devonshire, the Rhine valley, and Russia; and the Old Red Sandstone.
		Of land animals, the chief vestige is the footprint of a primitive salamanderlike amphibian in the Upper Devonian of Pennsylvania.
		Trees made their first appearance; the Devonian plants were the earliest to be extensively preserved as fossils, but their high degree of development suggests that more primitive forms existed earlier.
	www.bartleby.com /aol/65/de/Devonian.html (314 words)

	Late Devonian extinction - Wikipedia, the free encyclopedia
		The Late Devonian extinction was one of five major extinction events in the history of the Earth's biota.
		The late Devonian crash in biodiversity was more drastic than the familiar extinction event that closed the Cretaceous: a recent survey (McGhee 1996) estimates that 22 percent of all the families of marine animals (largely invertebrates) were eliminated, the category of families offering a broad range of real structural diversity.
		Evidence such as glacial deposits in northern Brazil (located near the Devonian south pole) suggest widespread glaciation at the end of the Devonian, as a large continental mass covered the polar region [3].
	en.wikipedia.org /wiki/Late_Devonian_extinction (810 words)

	Life of the Devonian
		The Devonian seas were dominated by brachiopods, such as the spiriferids, and by tabulate and rugose corals, which built large bioherms, or reefs, in shallow waters.
		Bivalves, crinoid and blastoid echinoderms, graptolites, and trilobites were all present, though most groups of trilobites disappeared by the close of the Devonian.
		Devonian, in The Ecology of Fossils, W.S.McKerrow, ed.
	www.ucmp.berkeley.edu /devonian/devlife.html (453 words)

	Wikinfo \| Devonian period (Site not responding. Last check: 2007-10-21)
		The Devonian follows the Silurian period and precedes the Mississippian subperiod of the Carboniferous.
		The Devonian was called the “greenhouse age.” Widespread reefs indicated that the climate was mild and warm, as well as generally dry.
		The main contributors of the Devonian reefs were unlike modern reefs that are constructed by corals and calcareous algae: calcareous algae and coral-like stromatoporoids, and tabulate and rugose corals, in that order of importance.
	www.wikinfo.org /wiki.php?title=Devonian_period (645 words)

	The Geology of Ohio--The Devonian
		The Devonian Period was an important episode in the history of the Earth.
		The Devonian System was named in 1839 by Roderick Murchison and Adam Sedgwick for a series of greatly disturbed sedimentary rocks that lay between the Silurian and the Carboniferous rocks in Britain.
		With one exception, all of the outcropping Devonian rocks in the state are of Middle or Late Devonian age.
	www.dnr.state.oh.us /geosurvey/oh_geol/99_No_1/devonian1.htm (1111 words)

	Devonian Period
		The Devonian was proposed by Roderick I. Murchison and Adam Sedgewick in 1840.
		The base of the Devonian is defined immediately at the first appearance of the graptolite species Monograptus uniformis in the rhythmically alterating limestones and calcareous shales of ‘Bed 20’ in the Klonk Section, which is located about 35km southwest of Prague, near the village of Suchomasty, in the Czech Republic.
		The youngest Devonian and earliest Carboniferous beds are characterized by a sequence of predominantly biodetrital oolitic limestone within a pelagic matrix of shale and cephalopod bearing calcilutites.
	www.peripatus.gen.nz /paleontology/Devonian.html (1266 words)

	The Devonian Period of the Paleozoic Era
		During the Devonian, there were three major continental masses: North America and Europe sat together near the equator, much of their current land underneath seas.
		For much of the Devonian, large areas of North America and Europe, and smaller parts of Africa, South America, and Australia were covered by seas, which withdrew during the end of the period.
		The Devonian is also notable for the rapid diversification in jawed and bony fish.
	www.science501.com /PTDevonian.html (807 words)

	Archaean Time
		Because of the extensive radiation of fishes, the Devonian is often called the age of fishes.
		Devonian fish were some of the first vertebrates to evolve, and can be grouped into five classes: 1) agnatha or "jawless fish"; 2) spiny fish; 3) Placoderms or "platedskins"; 4) Chondrichthyes or otherwise known as sharks, and; 5) the bony fishes.
		The Devonian seas were filled with brachiopods, and by tabulate and rugose corals that built large bioherms, or reefs, in shallow waters.
	www.fossilmall.com /Science/Paleobiology/Devonian.htm (414 words)

	Devonian
		Devonian is a time interval from 416 to 359 Ma in the Palaeozoic era.
		Invertebrates of the Devonian period are essentially of types established in the Ordovician (505-440 Ma).
		The first spiders, millipedes and insects appear in the Devonian, but the Devonian is called the "Age of Fishes" since freshwater and marine varieties proliferate.
	www.geosci.usyd.edu.au /users/prey/FieldTrips/Yass04/Devonian.html (1996 words)

	The Devonian (Site not responding. Last check: 2007-10-21)
		The oldest known vascular plants in the Northern Hemisphere are Devonian.
		By the end of the Devonian, ferns, horsetails and seed plants had also appeared, producing the first trees and the first forests.
		The Devonian Period is part of the Paleozoic Era.
	www.ucmp.berkeley.edu /devonian/devonian.html (323 words)

	Prehistoric Life - Devonian Period in Victoria. (Site not responding. Last check: 2007-10-21)
		In Victoria, rocks of Devonian age occur in the east-central part of the state (including the outer eastern suburbs of Melbourne and the Kinglake district), West Gippsland (e.g.
		The Devonian sequences are rich in fossils, including corals, brachiopods, sea stars, trilobites, gastropods and bivalves.
		Pleurodictyum megastoma from the Lower Devonian of the Heathcote district, Victoria.
	www.museum.vic.gov.au /prehistoric/fossils/devonian.html (140 words)

	The Devonian Period: The Age of Fish
		During the Devonian there were important changes in the land masses on the globe.
		The Devonian Period is known as the Age of Fishes.
		Sharks are thought to be descendents of the large Placoderms, but they lost the ability to form the boney armor on the outside of the body and were unable to form bones on the inside also.
	www.fossils-facts-and-finds.com /devonian_period.html (852 words)

	Oklahoma Trilobites
		The two primary formations are the Haragan and Bois d' Arc, with soft limestone that yields with proper equipment and skilled operator beautiful honey-colored trilobites of a shade and quality resembling those from the Saint Petersburg region of Russia.
		Interestingly, the Devonian trilobites of Oklahoma have look-a-likes found in the Atlas Mountains of Morocco.
		Devonian, present-day Morocco was part of the Eastern continental shelf of Gondwana, and present-day Oklahoma was part of the Southern continental shelf of Euramerica.
	www.fossilmuseum.net /Fossil_Sites/devonian_trilobites_of_oklahoma/devonian_trilobites_of_oklahoma.htm (745 words)

	Strata of Devonian Age, Kentucky Geological Survey site (Site not responding. Last check: 2007-10-21)
		Devonian strata consits of limestones and dolostones and a thick deposit of dark gray to fl shale.
		During the Late Devonian, muds were deposited beneath a sea that covered most of the eastern United States.
		The gas reservoir is in Devonian shales buried deep beneath the surface.
	www.uky.edu /KGS/geoky/devonian.htm (243 words)

	Silurian and Devonian Rocks
		The Silurian and Devonian Periods are divisions of the Paleozoic Era.
		The Silurian was followed by the Devonian Period, from 408 to 360 million years ago.
		During the Devonian, land plants grew into the first forests, and the first vertebrate animals colonized the land.
	tapestry.usgs.gov /ages/silurdevon.html (120 words)

	Evolution: Change: Deep Time
		Intense reef building activity in shallow-water habitats indicates that the Devonian climate is, on the whole, warm and stable.
		During the Devonian period, survivors from the late Ordovician extinction steadily recover.
		For example, many shallow-water and reef-dwelling species probably died off in the Devonian because they (or their habitats) were more sensitive to changes in ocean chemistry or temperature than surviving animals that lived in deeper waters.
	www.pbs.org /wgbh/evolution/change/deeptime/devonian.html (903 words)

	Devonian Period - Search Results - MSN Encarta (Site not responding. Last check: 2007-10-21)
		Devonian Period, fourth division of the Palaeozoic Era of the geological timescale, spanning an interval from about 422 to 359 million years ago,...
		This period is also known as the age of fishes, because of their abundant fossils in Devonian rocks.
		In the days before satellite communication Valentia island was famous for being the site where the Atlantic cable joined telegraphic communications...
	uk.encarta.msn.com /Devonian_Period.html (119 words)

	The Devonian Period (Site not responding. Last check: 2007-10-21)
		The beginning of the Devonian is defined by the wide spread appearence of vascular plants that developed at the end of the Silurian period (440 mya to 410 mya).
		The end of the Devonian period is distinguished by a major extinction leading into to Carboniferous (360 mya to 286 mya).
		The Devonian period is often called the age of fish because of the extensive diversification in ocean life that took place.
	www.ddg.com /Lauren/geologicages/devonian.html (499 words)

	devonian
		The Devonian or Old Red Sandstones are found from Cornwall to Shetland and although they were only used for roofing in a few locations some of these were very large industries producing a range of products, especially flagstones for 18th and 19th century towns and cities World-wide.
		It was previously placed at the bottom of the Devonian but is now at the top of the Silurian - in the Pridoli, so care is needed when using older texts and maps.
		Devonian geology is differentiated into five main units but one of these is only present in England and one only in England and Wales
	www.stoneroof.org.uk /devon.html (1172 words)

	The Devonian Period : Shannon McKenrick & Elizabeth Morrison
		The Devonian Period is also known as "The Age of Fishes" because of its highly diverse fish population (which were the dominate organisms of the time).
		The Early and Middle Devonian were warm, tropical and mild.
		Maryland during the Devonian was covered in shallow, warm seas, and was part of the Baltica continent.
	www.waterlilly.net /devonian/devonian.html (305 words)

	Devonian Period (Site not responding. Last check: 2007-10-21)
		The term Devonian was first used in the 1830s to describe a sequence of rocks in Devon, England.
		The name Devonian was derived from the name of that part of England.
		These Devonian rocks were defined based on a particular type of fossil assemblage contained within them.
	www.watersheds.org /earth/gtime02d.htm (84 words)

	Devonian Shales (Site not responding. Last check: 2007-10-21)
		The oldest of the Devonian rocks in Ohio, the Holland Quarry Shale near Toledo, formed in the brackish waters of a shallow bay.
		Middle Devonian rocks of the region reveal the spread of a shallow sea.
		Later Devonian deposits of the Ohio Shale hint at environmental changes in the shallow sea.
	www.paleoportal.org /famous_finds/assemblage.php?assemblage_id=13 (534 words)

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