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Topic: Jurassic Period

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	Jurassic - LoveToKnow 1911
		The study of Jurassic rocks has continued to attract the attention of geologists, partly because the bedding is so well defined and regular - the strata are little disturbed anywhere outside the Swiss Jura and the Alps - and partly because the fossils are numerous and usually well-preserved.
		The Jurassic period was marked by a great extension of the sea, which commenced after the close of the Trias and reached its maximum during the Callovian and Oxfordian stages; consequently, the Middle Jurassic rocks are much more widely spread than the Lias.
		The thickness of Jurassic rocks in England is 4000 to 5000 ft., and in Germany to 3000 ft. Most of the rocks represent the deposits of shallow seas, but estuarine conditions and land deposits occur as in the Purbeck beds of Dorset and the coals of Yorkshire.
	www.1911encyclopedia.org /Jurassic (2850 words)

	Jurassic Period - ninemsn Encarta
		Jurassic Period, middle of the three periods of the Mesozoic Era of the geological timescale.
		During the Jurassic’s 64-million-year duration, the supercontinent of Pangaea fragmented.
		The Jurassic macroflora was dominated by the gymnosperms; angiosperms (flowering plants) are first unequivocally recorded in rocks of the succeeding Cretaceous.
	au.encarta.msn.com /encyclopedia_761552997/Jurassic_Period.html (1007 words)

	Jurassic Period - MSN Encarta
		Jurassic Period, second division of the Mesozoic Era of the geologic time scale (Geology), extending over a period from about 200 million to 145 million years before present.
		The Jurassic was preceded by the Triassic Period and followed by the Cretaceous Period.
		Evidence that the Jurassic climate was warm and moist is provided by widespread coral reefs and by the remains of temperate and subtropical forests consisting largely of the gymnosperms (cycads and conifers), ginkgoes, and seed ferns.
	encarta.msn.com /encyclopedia_761552997/Jurassic_Period.html (441 words)

	NationMaster - Encyclopedia: Triassic
		As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic.
		The extinction event that closed the Triassic period has recently been more accurately dated, but as with most older geologic periods, the rock beds that define the start and end are well identified, but the exact dates of the start and end of the period are uncertain by a few million years.
		The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.
	www.nationmaster.com /encyclopedia/Triassic (657 words)

	AllRefer.com - Jurassic period (Geology And Oceanography) - Encyclopedia
		In the Early Jurassic, large areas of Arizona, Colorado, and Utah were apparently desert, and the sand was later consolidated into the white and pinkish Glen Canyon and Navajo sandstones, which now enhance the scenic beauty of the district.
		The retreat of the Logan Sea, toward the end of the period, was followed, probably in the Upper Jurassic but possibly in the Lower Cretaceous Period, by the deposition of the Morrison continental series of clays and sandstones, noted for its richness in fossil dinosaurs.
		The close of the Jurassic in North America was marked by widespread folding along the western border of the continent, accompanied by the intrusion of lava as the eastern edge of the plate that carries the Pacific Ocean was thrust beneath the westward drifting plate that carries the North American continent.
	reference.allrefer.com /encyclopedia/J/Jurassic.html (577 words)

	The Jurassic Period
		this was the Jurassic Period, beginning approximately 210 million years ago and lasting for 70 million years of the Mesozoic Era.
		Outside of Hollywood, the Jurassic is still important to us today, both because of its wealth of fossils and because of its economic importance -- the oilfields of the North Sea, for instance, are Jurassic in age.
		The Jurassic Period is part of the Mesozoic Era.
	www.ucmp.berkeley.edu /mesozoic/jurassic/jurassintro.html (211 words)

	Jurassic Period: World of Earth Science
		Driven by plate tectonics during the Jurassic Period, the North American and European continents diverged, and the earliest form of the Atlantic Ocean flooded the spreading sea floor basin between the emerging continents.
		By the end of the Jurassic Period, water separated South America from Africa, and the Australian and Antarctic continents were clearly articulated.
		The Jurassic Period (in popular culture widely recognized as the "Age of the Dinosaurs") was named for the Jura Mountains on the Swiss-French border, an area where the classic formations were first identified and studied.
	www.enotes.com /earth-science/jurassic-period (516 words)

	Jurassic Summary
		The Jurassic period is known for an increase in the numbers and diversity of dinosaurs.
		The Jurassic Period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago), at the end of the Triassic to 146 Ma, at the beginning of the Cretaceous.
		The Jurassic was named by Alexandre Brogniart for the extensive marine limestone exposures of the Jura Mountains, in the region where Germany, France and Switzerland meet.
	www.bookrags.com /Jurassic (2074 words)

	Jurassic Period
		This dinosaur extinction was paralleled by a shift in dominate vegetation from the conifers and cycads of the Jurassic period to shorter, primitive flowering trees (346).
		Some say that the Jurassic period may as well have been called the age of the Cycads because they are the most common impression fossil found from this time period (Stewart, 1983).
		This decrease seems to have occurred towards the beginning of the period and then a rise to a level it remained constant at for the rest of the period (Hallam, 1977).
	www.denison.edu /biology/bio380-2001/jurassic.html (1246 words)

	Jurassic Period: World of Earth Science
		Driven by plate tectonics during the Jurassic Period, the North American and European continents diverged, and the earliest form of the Atlantic Ocean flooded the spreading sea floor basin between the emerging continents.
		By the end of the Jurassic Period, water separated South America from Africa, and the Australian and Antarctic continents were clearly articulated.
		The Jurassic Period (in popular culture widely recognized as the "Age of the Dinosaurs") was named for the Jura Mountains on the Swiss-French border, an area where the classic formations were first identified and studied.
	science.enotes.com /earth-science/jurassic-period (516 words)

	Jurassic period - Encyclopedia.com
		Jurassic period [from the Jura Mts.], second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago.
		In the Early Jurassic, large areas of Arizona, Colorado, and Utah were apparently desert, and the sand was later consolidated into the white and pinkish Glen Canyon and Navajo sandstones, which now enhance the scenic beauty of the district.
		The plant life of the Jurassic was dominated by the cycads, but conifers, ginkgoes, horsetails, and ferns were also abundant.
	www.encyclopedia.com /doc/1E1-Jurassic.html (799 words)

	Palaeos Mesozoic: Jurassic: The Jurassic Period
		All of the new photosynthetic forms of the Jurassic were "red," with chloroplasts of the red algae type, with chlorophyll c, rather than the chlorophyll b of green plants and green algae (Chlorophyta).
		The Jurassic variety are probably some type of radiolarian-like protist and may have nothing at all to do with the Paleozoic acritarchs.
		The Jurassic radiation of radiolarians was largely a radiation of the Spumellaria in the latter half of the Jurassic.
	www.palaeos.com /Mesozoic/Jurassic/Jurassic.htm (2386 words)

	Late Jurassic Period @ Planet Dinosaur
		During the Jurassic, Tibet joined Eurasia, and, as the period ended, Africa brushed against southern Europe, losing chunks of crust that formed portions of land as far apart as Arabia and Spain.
		Jurassic lands were generally greener and more lush than they had ever been in Triassic times, and vegetation types were more uniform worldwide.
		In the early Jurassic, the main plant eating vertebrates were prosauropod and ornithischian dinosaurs, and small, mammal like reptiles.
	planetdinosaur.com /dinosaur_worlds/late_jurassic.htm (448 words)

	The jurassic time period
		The Jurassic Period is also known as the Age of the Dinosaurs and occurred 205 to 145 million years ago.
		In the beginning of the Jurassic Period most of the continents were joined together before the Atlantic began to form and the Americas split off from Africa.
		The end of this era in North America was marked by widespread folding along the western border of the continent with the intrusion of lava as the eastern edge of the plate that carries the Pacific Ocean was thrust underneath the westward drifting plate that carries the North American continent.
	mn.essortment.com /jurassicperiod_rnzw.htm (828 words)

	iKnowthat.com - Clearing Daytime Discover More Story
		The Jurassic period occurred during the middle of the Mesozoic Era, the Age of Dinosaurs.
		The greenhouse climate of the Jurassic period encouraged the growth of a variety of vegetation.
		The plants of the Jurassic period were all non-flowering plants that reproduced from seed, cones or spores.
	www.iknowthat.com /StickerBookApp/sbr/Dinosaurs/Backgrounds/DiscoverMore/Clearing_Daytime.htm (416 words)

	timeline jurassic period (timeline julasik period) information. (Site not responding. Last check: )
		Jurassic Period 206-144 million years ago, The Atlantic Ocean begins to form as North America separates from Africa and South..
		In the Jurassic period the climate changed as the huge continent was breaking up.
		The second period was the Jurassic period (208-146 million years ago),..
	www.translation-directory.com /t/timeline_jurassic_period.html (127 words)

	Learn about time Periods
		During this period the world was very different, consisting of one large super-continent known as Pangaea.
		Jurassic life was dominated by the sea, with ammonites, belemnites and fish being hunted by predatory air breathing marine reptiles such as Ichthyosaurs and Plesiosaurs.
		During this period the gulf between America and Europe continued to grow as the continents drift further apart, opening up the expanse of the Atlantic Ocean.
	www.jurassiccoastline.com /Periods.asp (640 words)

	JURASSIC PERIOD,
		Toward the end of the Jurassic, these shallow seas began to drain away, leaving behind thick limestone deposits in which some of the world’s richest accumulations of oil and gas would form.
		That the Jurassic climate was warm as well as moist is shown by widespread coral reefs and by temperate and subtropical forests consisting largely of the gymnosperms (cycads and conifers), ginkgoes, and seed ferns.
		In 1822 Jurassic strata in Sussex, England, yielded the bones of one of the first dinosaurs to be discovered, Iguanodon.
	www.history.com /encyclopedia.do?vendorId=FWNE.fw..ju042900.a (884 words)

	What was the Jurassic Period?
		The Jurassic period was a geologic period in the middle of the Mesozoic.
		During the Jurassic period, the dinosaurs continued their dominance of the land, while marine reptiles such as ichthyosaurs, plesiosaurs and marine crocodiles occupied the sea.
		The Jurassic period is one of the periods of life on Earth most familiar to the average person, because it has been extensively romanticized since the initial discovery of dinosaur fossils in the early nineteenth century.
	www.wisegeek.com /what-was-the-jurassic-period.htm (398 words)

	Jurassic Period
		One of the only dinosaurs capable of attacking the Sauropods was the ferocious Allosaurus, which also appeared in the Jurassic.
		It was 30 feet long, and it would give rise to even larger carnivores, such as the infamous Tyrannosaurus Rex, in the Cretaceous.
		The first known bird, Archaeopteryx, was probably descended from the dinosaurs and ascended in the Jurassic.
	library.thinkquest.org /20886/jurassic.htm (235 words)

	The Dispatch - Serving the Lexington, NC - News
		The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 Â± 0.6 Ma (million years ago) to 145.4 Â± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
		The Jurassic was the golden age of the great sauropods—Apatosaurus, Diplodocus, and many others—that roamed the land late in the period; their mainstays were either the prairies of ferns, palm-like cycads and bennettitales, or the higher coniferous growth, according to their adaptations.
		The name of the novel and movie Jurassic Park referred to the Jurassic period, although many of the creatures featured in the novel and movie are from the Cretaceous period, such as the Tyrannosaurus Rex and the Triceratops.
	www.the-dispatch.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Jurassic_period (907 words)

	Timerock Fossils, Minerals & Crystals - Geological Periods - Description
		During the Ordovician Period, most of the land mass of the Earth was in the super-continent of Gondwana while the northern Hemisphere was almost entirely ocean.
		Periods of glaciation during the Carboniferous Period, caused vast amounts of plant material from the forests to be preserved at great pressures under ice and water.
		At the end of the Cretaceous Period, came the fifth and most recent of the "great extinctions", probably caused by an asteroid about 6 miles (10 km) in diameter striking the Earth on the Yucatan coast of Mexico.
	www.timerock.com /timerock/library/time/geological_periods.htm (1112 words)

	Palaeos Mesozoic: Jurassic: Late Jurassic Period (The Malm Epoch)
		The late Jurassic period sees the evolution of some of the greatest dinosaurs of all.
		The sauropods continue to flourish and to diversify, as the older Mid-Jurassic cetiosaurids are replaced by a diverse Late Jurassic fauna of camarasaurs, Brachiosaurs, and diplodocids.
		As with the early Jurassic scelidosaurs, this latter group are almost totally indigenous to Europe (which may well be the centre of evolution of these armoured dinosaurs) during the Jurassic period.
	www.palaeos.com /Mesozoic/Jurassic/LateJura.html (1613 words)

	Jurassic Period
		The minor extinction at the end of the Triassic period gave heights to a large quantity of dinosaurs in the Jurassic period.
		Towards the late Jurassic period, the flowering plants, angiosperms developed, and would soon change the face of the Earth.
		In the seas of the Jurassic period were many abundant coral reefs, fish, fishlike reptiles known as ichthyosaurs, plesiosaurs, giant marine crocodiles, ammonites, squids, shards and the first ever know rays.
	www.dinopark.org /JurassicPeriod.html (302 words)

	Early Jurassic Period - The Lias epoch
		Moving now from the Triassic to the Early Jurassic, we find that the dinosaurs have attained dominance, while most of the other Triassic types of animals have died out in two major Triassic extinctions - the mid-Carnian and the terminal Rhaetic.
		As the Jurassic Period opened, Italy, Greece, Turkey, and Iran were attached to the North African portion of Gondwanaland.
		But already the plesiosaurs were beginning to evolve into the familiar long-necked small-headed Plesiosauroidea and the larger headed, short necked, streamlined Pliosauroidea that were to inhabit the oceans for the rest of the Mesozoic era.
	www.palaeos.com /Mesozoic/Jurassic/EarlyJura.html (872 words)

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