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Topic: Middle Jurassic

	Jurassic - LoveToKnow 1911 (Site not responding. Last check: 2007-09-15)
		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.
		Marine Lower and Middle Jurassic beds occur on the Pacific coast (California and Oregon), and in Wyoming, the Dakotas, Colorado, east Mexico and Texas.
	www.1911encyclopedia.org /Jurassic (2850 words)

	Palaeos Mesozoic: Jurassic: The Jurassic Period
		The Jurassic saw disintegration of Pangea that began in the Triassic continuing apace.
		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 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)

	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)

	Late Jurassic Period @ Planet Dinosaur (Site not responding. Last check: 2007-09-15)
		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)

	[No title]
		At the beginning of the Jurassic, the Earth's continents were still jammed together, forming the supercontinent Pangaea, but they were beginning to drift apart.
		In the Jurassic seas, there were abundant coral reefs, fish, ichthyosaurs (fishlike reptiles), plesiosaurs, giant marine crocodiles, ammonites, squid, sharks and the first rays.
		The Jurassic period is named for rock strata found in the Jura Mountains, which are located between France and Switzerland.
	www.koolpages.com /dinoworld/Jurassic.html (482 words)

	Jurassic - Wikipedia, the free encyclopedia
		The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago), at the end of the Triassic to 145.4 ± 4.0 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.
		The Jurassic was the golden age of the great sauropods--of Apatosaurus, Diplodocus, and many others--who 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.
	en.wikipedia.org /wiki/Jurassic (997 words)

	MESOZOIC the DINOSAURS Diorama Cretaceous, Jurassic, Triassic, Early, Middle, Late
		The Middle Triassic is a period of transition as dicynodonts and cynodonts whose ancestors dominated the Late Permian decline and archosaurs the ancestors of dinosaurs and crocodiles experiment with a variety of plant eating and carnivorous forms.
		The Late Jurassic 159 - 144 million years ago is the Golden age of the Giant Sauropods.
		A fragment of the Jurassic lingers on in the
	www.dinosaurcollector.150m.com /mesozoic_home.htm (1143 words)

	BBC - Science & Nature - Horizon - The Mystery of the Jurassic
		In the early Jurassic, 200 million years ago, they were a relatively small group of primitive creatures.
		By the late Jurassic, 50 million years later, they had become the magnificent array of carnivores and giant plant eaters that would dominate the planet for millions of years.
		In between lies the mysterious period of the middle Jurassic in which all these changes must have happened.
	www.bbc.co.uk /science/horizon/2001/jurassicmystery.shtml (689 words)

	The Middle Jurassic Oseberg delta, northern North Sea; a sedimentological and sequence stratigraphic interpretation -- ...
		The Middle Jurassic Oseberg delta, northern North Sea; a sedimentological and sequence stratigraphic interpretation -- Muto and Steel 81 (7): 1070 -- AAPG Bulletin
		The Middle Jurassic Oseberg delta, northern North Sea; a sedimentological and sequence stratigraphic interpretation
		The Aalenian Oseberg Formation (0-80 m thick) is an important reservoir unit in the Middle Jurassic Brent Group in the northern North Sea, consisting of multiple sets of sandy Gilbert-type deltas.
	aapgbull.geoscienceworld.org /cgi/content/abstract/81/7/1070 (434 words)

	The Jurassic Period (Site not responding. Last check: 2007-09-15)
		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)

	GulfBase - General Facts about the Gulf of Mexico
		Rifting probably continued through Early and Middle Jurassic time with the formation of "stretched" or "transitional" continental crust throughout the central part of the basin.
		Intermittent advance of the sea into the continental area from the west during late Middle Jurassic time resulted in the formation of the extensive salt deposits known today in the Gulf of Mexico basin.
		Since Late Jurassic time, the basin has been a stable geologic province characterized by the persistent subsidence of its central part, probably due at first to thermal cooling and later to sediment loading as the basin filled with thick prograding clastic wedges along its northwestern and northern margins, particularly during the Cenozoic.
	www.gulfbase.org /facts.php (2399 words)

	An overview of the Jurassic Cliffs in Dorset
		As a result of many visits to the Jurassic coastline and the surrounding area of west Dorset, I decided to create this website as a means of sharing this passion with you and with many others.
		The Jurassic period, which can be found exposed in the Charmouth / Lyme Regis / Seatown / West Bay areas of the West Dorset coastline, forms the middle part of the Mesozoic era and spans a time period of between 208 million and 144 million years ago (Ma).
		The result is a belt of rocks of Jurassic age that stretch across England from Dorset in the southwest to Yorkshire in the northeast.
	easyweb.easynet.co.uk /~gcaselton/fossil/fos-txt.html (2561 words)

	The Jurassic Period of the Mesozoic Era
		At the beginning of the Jurassic period most of the continents were joined together until the Atlantic began to form and the Americas split off from Africa.
		During the end of the Jurassic North America had 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.
		The plant life of the Jurassic period was dominated by the cycads, but conifers, ginkgoes, palms, horsetails, and ferns were also abundant.
	www.science501.com /PTJurassic.html (580 words)

	Personal Web Page
		Lower and Middle Jurassic of Western Tethys (Portugal, NW Africa, SE France, Apennines); Hettangian palaeogeaographic differentiation; Toarcian crises and recoveries; Toarcian to Early Callovian ammonites (esp. Hildocerataceae, Hammatocerataceae, Hecticocerataceae); palaeobiology of carbonate platforms; mapping; Jurassic palaeostructures and tectonics.
		Jurassic brachiopods; marine sequence stratigraphy of the Qinghai-Tibetan Plateau, eastern Tethys; Mesozoic-Cenozoic sedimentary-tectonic evolution of the Himalayas.
		Jurassic radiolarian biostratigraphy of pelagic sediments in Panthalassa Ocean; correlation and palaeogeographic reconstruction of accretionary sedimentary complexes of Circum-pacific region.
	www.es.ucl.ac.uk /people/bown/ISJSwebsite.htm (2019 words)

	BBC - Science & Nature - Horizon - The Mystery of the Jurassic - Transcript
		OLIVER RAUHUT: You see at the beginning of the Jurassic what we had was all the land masses, all the continents lumped together in one giant super-continent that was then surrounded by just one giant ocean.
		PHIL MANNING: Climate is an important factor and it's one which obviously affected the dinosaurs in the middle Jurassic, but it is not a single factor that could have done it alone, for the simple reason dinosaurs, if the climate changed became terrible, they would up sticks and move.
		NARRATOR: The Argentinean dinosaur was an early ancestor of the predators that went on to dominant the late Jurassic, but the crucial thing was that it was virtually identical to dinosaurs in the Northern Hemisphere and this could only be the case if the dinosaurs were able to migrate freely between north and south.
	www.bbc.co.uk /science/horizon/2001/jurassicmysterytrans.shtml (4797 words)

	Titanite in Volcanic Rocks
		From Middle Jurassic to Late Jurassic, however, the arc changed from a low-standing depression to a higher standing region of modestly thickened crust (Elison 1995) of mixed origin that has been called the Mesocordilleran Geanticline (Kauffman and Caldwell 1993).
		We have examined the mineralogy of numerous volcanic ash beds ranging in age from Middle Jurassic to Tertiary from the western U.S. and find some interesting patterns that may be related to changes in the character of the source region.
		This, in turn, may be related to the fact that Jurassic plutons of this same age have Nd, Sr, and Pb isotopic ratios that cluster nearer to bulk earth ratios unlike younger Late Cretaceous and Tertiary plutons (Elison 1995).
	www.geology.byu.edu /faculty/bjk/research/titanite/titanite.htm (2248 words)

	Pre-Chalk Plays - Energistyrelsen (Site not responding. Last check: 2007-09-15)
		In addition; coal beds from the Middle Jurassic and the Upper Carboniferous could also be potential source rocks for the pre-chalk sandstone reservoirs.
		The Middle Jurassic reservoir sediments consist of marine to fluvial sandstones, transported by rivers and marine coastal processes to the Central Graben.
		Hejre-1 was drilled to a depth of 5265 m TVDSS and encountered oil in Late Jurassic sandstones with a very good reservoir quality, Hence defining the deepest oil accumulation found in the Danish area to date.
	www.ens.dk /sw10372.asp (1034 words)

	Staithes, Yorkshire Coast, UK - Geology Field Guide
		Jurassic deltaic deposits (in the Middle Jurassic of Yorkshire) show that rivers were actively transporting much material to the shallow seas and, in addition to clastics, this would have included iron as organic colloids.
		Abstract: Two thin sandstone and siltstone horizons in the Middle Lias (Lower Jurassic) of the Yorkshire coast, informally called the lower and upper striped beds, are characterised by small-scale fining-upward layers associated with filled scour channels (gutter marks).
		Howarth, M.K. The Middle Lias of the Dorset Coast.
	www.soton.ac.uk /~imw/staithes.htm (8410 words)

	Jurassic Field Trip Guide - Dorset, England - Bridport Sands of West Bay
		The section to be studied is east of Bridport Harbour or West Bay is in the Bridport Sands of the Upper Lias, one of the major sandstones in the Jurassic sequence in Dorset, and of importance as an oil reservoir rock.
		Further west of the harbour is Middle Jurassic Frome Clay or Upper Fullers Earth and some Forest Marble seen at West Cliff or Watton Cliff.
		Tectonics and Sedimentation in the Lower/Middle Jurassic of the Wessex Basin.
	www.soton.ac.uk /~imw/bridport.htm (11252 words)

	Middle Late Jurassic CHINA Chuanjiesaurus Mamenchisaurus Szechuanosaurus Sinosauropteryx Sinraptor models toy figures ...
		China has produced two of the most diverse Middle Jurassic faunas in the world.
		The Middle and Late Jurassic China seems to have been isolated from the faunas of Africa and North American.
		Szechuanosaurus was a Late Jurassic medium-sized meat-eater that lived in China and was related to Allosaurus.
	www.dinosaurcollector.150m.com /Jura_china.html (619 words)

	Drilling CI Jurassic? - November 19, 2006 - Petroleum News
		The middle Jurassic Tuxedni has been identified by the U.S. Geological Survey as the main source rock for almost all of the oil present in the Hemlock and Tyonek.
		XTO, which purchased platforms A and C at the Middle Ground Shoal field from Shell Oil in 1998, has also looked at testing the Jurassic, but the idea has not resurfaced since 2002 when the oil price picture was significantly less optimistic than it is today.
		Testing the Jurassic from one or more of the unit’s platforms is an “option is being considered along with a wide spectrum of oil development opportunities in Cook Inlet, including Jurassic.
	www.petroleumnews.com /pntruncate/166704101.shtml (1349 words)

	Interrad: Mém.Géol.(Lausanne) Nº 23
		Middle and Upper Jurassic radiolarian assemblages co-occurring with ammonites from the Subbetic Realm (Southern Spain)
		New Middle and Upper Jurassic radiolarian assemblages co-occurring with ammonites and nannofossils from the Southern Alps (Northern Italy)
		Middle to Upper Jurassic radiolarian biostratigraphy of the Ionian and the Maliac Zones (Greece)
	www-sst.unil.ch /publications/interrad.htm (615 words)

	Stenopterygius--Jurassic Reptiles
		The Ichthyosauruses were most prevalent during the Jurassic period.
		Jurassic Fine Art Pictures in 14" x 17" Museum Quality Frames with Double Matted in Glass.
		The mission of Dinosaur Corporation® is to support education and heighten the awareness of dinosaurs and other prehistoric animals.
	store.dinosaurcorporation.com /jurassic2.html (200 words)

	Jurassic HSU NHM
		Jurassic* ammonites and dinosaurs made a huge comeback after their near extinction at the end of the Triassic.
		The Pangaea supercontinent began breaking up during the Jurassic, with the birth of the Central Atlantic Ocean at the end of the Middle Jurassic.
		*Jurassic derives from Alexander von Humboldt's use of the term “Jura Kalstein” for carbonate deposits in the Jura region of Switzerland in 1799.
	www.humboldt.edu /~natmus/lifeThroughTime/Jurassic.web/index.htm (549 words)

	Atlasaurus imelakei n.g., n.sp., a brachiosaurid-like sauropod from the Middle Jurassic of Morocco
		Atlasaurus imelakei n.g., n.sp., a brachiosaurid-like sauropod from the Middle Jurassic of Morocco
		The presence of large sauropods of middle Jurassic age is very important in understanding the history and the evolution of these Mesozoïc giants.
		The middle Jurassic dinosaurs of China appear to be endemic to eastern Asia (Russell, 1993; Upchurch, 1995).
	www.elsevier.fr /html/news/monbaron/monbaron.html (3722 words)

	Early and Middle Jurassic Radiolarians
		Plate 2 Scanning electron microphotographs of Aalenian (Middle Jurassic) radiolarians from the mudstone of samples S28 in the Shimizu Formation of the Northern Chichibu Belt.
		Plate 3 Scanning electron photomicrographs of early Toarcian (Early Jurassic) radiolarians from the mudstone of sample S14 in the Shimizu Formation of the Northern Chichibu Belt.
		Plate 4 Scanning electron microphotographs of early Toarcian (Early Jurassic) radiolarians from the mudstone of sample S14 in the Shimizu Formation of the Northern Chichibu Belt.
	page.freett.com /tilting/shimizumisatoken.html (454 words)

	ScienceDaily: Jurassic Period Mammal Teeth Found -- Prevailing Theories Challenged
		These small, furry creatures, the size of a house mouse, lived in Madagascar during the Middle Jurassic period -- about 165 million years ago -- scampering under the feet of allosaurs and brachiosaurs, much earlier than scientists had previously thought.
		It hasn't been connected to Africa since the Jurassic period, and is therefore an excellent place to study evolution.
		The fossils also contradict the estimates of scientists who study DNA to arrive at molecularly-based estimates of a Middle Jurassic divergence between the major groups of extant tribosphenidans, also called therians, said Wyss.
	www.sciencedaily.com /releases/1999/09/990903072257.htm (916 words)

	Jurassic Period - ZoomDinosaurs.com
		At the beginning of the Jurassic, the Earth's continents were still jammed together, forming the supercontinent Pangaea
		Early in the Jurassic, the continents were jammed together into a supercontinent (Pangaea), making much of the inland area dry and desert-like.
		Towards the middle of the Jurassic, when Pangaea becgan to break up, there were vast flooded areas, temperate and subtropical forests, and coral reefs.
	www.enchantedlearning.com /subjects/dinosaurs/mesozoic/jurassic (565 words)

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