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Topic: Late Jurassic

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	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)

	Palaeos Mesozoic: Jurassic: Late Jurassic Period (The Malm Epoch)
		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.
		Allosaurids are also known from the Late Jurassic of China and the middle Cretaceous of Australia, indicating that these carnivores were able to wander widely over the Earth's surface (unlike the euhelopid sauropods which are not known outside of China).
	www.palaeos.com /Mesozoic/Jurassic/LateJura.html (1613 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)

	Highbeam Encyclopedia - Search Results for Jurassic (Site not responding. Last check: 2007-11-03)
		Jurassic period [from the Jura Mts second period of the Mesozoic era of geologic time, lasting from 213 to 144 million years ago.
		At the start of the Jurassic most of the continents were joined together until the Atlantic began to form and the Americas split off from Africa.
		Stegosaurus [Grroof lizard], quadriped ornithischian dinosaur of the late Jurassic period.
	www.encyclopedia.com /SearchResults.aspx?Q=Jurassic (640 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)

	Allister Rees Mesozoic
		In the Jurassic, five main biomes are recognised from the data: seasonally dry (summerwet or subtropical), desert, seasonally dry (winterwet), warm temperate and cool temperate.
		Most Late Jurassic dinosaur remains are known from low-latitude to marginally midlatitude regions where plant fossils are generally sparse and evaporites common.
		Late Jurassic (150 Ma) paleogeographic maps (Mollweide projection with 30 degree latitude and longitude lines; courtesy of Chris Scotese).
	www.geo.arizona.edu /~rees/Jurassic.html (2141 words)

	Eastern Offshore Tectonics
		A second episode of rifting occurred from the Late Jurassic to the earliest Cretaceous, and resulted in the growth of a series of mainly north-south- trending faults and coeval uplift of a broad area at the southern end of the basin, known as the Avalon Uplift.
		The Late Triassic to Early Jurassic structural episode was responsible for the creation of the large half-graben that dominates the architecture of the southern and central portion of the basin.
		Structures related to the Late Jurassic to Early Cretaceous phase of extension include uplift of a broad region referred to as the Avalon Uplift in the southern part of the basin and the development of north-south-oriented faulting, which characterizes the central Jeanne d'Arc Basin and Central Ridge.
	members.tripod.com /petroinca/nfectect.htm (2426 words)

	MESOZOIC the DINOSAURS Diorama Cretaceous, Jurassic, Triassic, Early, Middle, Late (Site not responding. Last check: 2007-11-03)
		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)

	Jurassic plants and climates (Site not responding. Last check: 2007-11-03)
		Late Jurassic floral localities, with each leaf genus assigned to a morphological category, represented as a percentage of the total at each locality.
		By repeating the Early Jurassic statistical analysis for Middle and Late Jurassic floras, we arrive at three separate ordinations (for J1, J2 and J3 intervals, comprising 196, 288 and 160 northern hemisphere plant localities respectively).
		Jurassic floral gradient, derived from the averaged axis 1 scores of genera common to J1, J2 and J3 floras.
	pgap.uchicago.edu /JURfossilplants.html (1314 words)

	Jurassic geography and climates (Site not responding. Last check: 2007-11-03)
		The Jurassic has, of course, been the subject of much popular attention over the past few years due to the interest in dinosaurs.
		This is one of eleven stage-length intervals of the Jurassic Period for which we have compiled this level of global data.
		Jurassic phytogeography and climates: new data and model comparisons.
	pgap.uchicago.edu /Jurassic.html (399 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).
		In the late Jurassic the two super continents Laurasia and Gondwana were separated by a broad seaway, the Tethyan Seaway (Fastovsky, 35).
		The late Jurassic is at the time that birds were believed to have evolved.
	www.denison.edu /biology/bio380-2001/jurassic.html (1246 words)

	Late Jurassic Period
		During the late Jurassic Period most of the continents were joined together until the Atlantic Ocean began to form and the Americas split from Africa.
		The climate of the Jurassic was thought to be mild at perhaps 15 degrees Fahrenheit which is warmer than those of today.
		The plant life of the Jurassic was dominated by cycads, but there were also many conifers, ginkgoes, horsetails, and ferns.
	pt3.sbu.edu /VFTs/Dinos/latejurassic.htm (100 words)

	Jurassic Dinosaurs of Utah - Utah Geological Survey
		ugs / utah geology / dinosaurs and fossils / jurassic dinosaurs
		Allosaurus, Utah's State Fossil, was the dominant predator of North America during the Late Jurassic.
		Stegosaurus, the plated dinosaur, was one of the major plant-eaters of the Jurassic Period.
	geology.utah.gov /utahgeo/dinofossil/dinojur.htm (784 words)

	JURASSIC PERIOD (Site not responding. Last check: 2007-11-03)
		Gondwanaland was now breaking up, but until late in the period all the continents could still be crossed by dinosaurs.
		This was a quiet geological period, with steady deposition of sedimentary rocks - a period that favoured a burst of life both on land and in the water, where cephalopods such as ammonites and squid often reached enormous size (eg ammonites 1.2 m in diameter).
		By the late Jurassic the first birds were leaping into the air, where new, highly evolved pterosaurs flew.
	www.dinoruss.org /de_4/5c5cb13.htm (386 words)

	Clark - theropod gaps
		Applying this logic to the fossil record of coelurosaurians, the presence of Archaeopteryx in the Late Jurassic documents that the bird lineage was present at this time.
		For example, a lower jaw bone from the Early Jurassic of southern China appears to be from a therizinosaur (Xu, Zhao, and Clark, 2001, Journal of Vertebrate Paleontology 21:477-483).
		Protoavis from the Late Triassic of Texas, once touted as a true bird, appears to be a basal coelurosaurian, although Shuvosaurus from the same beds, described as an ornithomimid, is probably not a member of this coelurosaurian group (Rauhut, 1997, pp.
	www.gwu.edu /~clade/faculty/clark/theropodgaps.html (689 words)

	Jurassic and Cretaceous Field Trip - Fossil Forest, Dorset, England
		The Fossil Forest is a limestone ledge with a late Jurassic soil and remains of rooted trees.
		Late in the summer there were phases when the dried-up lagoon flooded again, perhaps as a result of the first major rains or because winds from the east backed up the lagoon waters and blew them over this marginal area.
		Tectonism occurred in the mid-Cretaceous (Late Kimmerian) and in the Tertiary (Alpine).
	www.soton.ac.uk /~imw/forest.htm (8011 words)

	The Jurassic in Europe (Site not responding. Last check: 2007-11-03)
		The boundary between the Triassic and Jurassic was originally identified by the ammonoid near-extinction (Gilluly and Woodford, 1961).
		In the Jurassic, Pangaea is divided into Tethyan and Boreal realms: Europe would have been one the border between the warmer, moister Tethyan and cooler Boreal climate.
		Still there was little relief in the Jurassic world: sometimes the blocks/massifs were covered with the seas and they were very low islands when they weren't covered so there is little evidence of coarse clastics (Gilluly and Woodford, 1961).
	www.oberlin.edu /Geopage/projects/204projects/spalding/The_Jurassic_in_Europe.html (1071 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.
		Though the epicontinental Sundance Sea left marine deposits in parts of the northern plains of the United States and Canada during the late Jurassic, most exposed sediments from this period are continental, such as the alluvial deposits of the Morrison Formation.
		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 (985 words)

	Late Jurassic to Recent (150 Ma - present day)
		During the late Jurassic – Early Cretaceous (150–120 Ma) early rift-fill lacustrine and fluvial sediments and minor volcanics (Casterton Formation and Crayfish Group) were deposited in a series of half-grabens formed in the Otway, and possibly Bass, basins as part of the Gondwana breakup.
		With the onset of sea-floor spreading between Australia and Antarctica during the Late Cretaceous Cenomanian, the terrestrial to marginal marine Sherbrook Group was deposited in the Otway Basin.
		This contrasts with the lacustrine rift-fill sediments of the Emperor and Golden Beach subgroups in the Gippsland Basin, associated with the development of the Tasman Sea rift during the Cenomanian to Early Campanian (95–80 Ma).
	www.dpi.vic.gov.au /dpi/nrenmp.nsf/FID/-A38C0EAC2CAFA246CA256C71001399AD?OpenDocument (580 words)

	USGS OF99-50I, Browse Basin, Australia- Rocks pt1 - Petroleum Occurrence (Site not responding. Last check: 2007-11-03)
		In the Browse Basin Province 3913 the Late Jurassic, Early Cretaceous-Mesozoic TPS is characterized by source rocks of Late Jurassic and Early Cretaceous age and potential and proven reservoir rocks that range in age through the entire Mesozoic (Fig.
		The Late Jurassic (Kimmeridgian) is not as thick or as rich in TOC as is found in other areas of offshore Australia, however, the interval is considered as possible source rock.
		An unconformity of Middle to Late Jurassic (Callovian-Oxfordian) age was characterized by Late Jurassic lava flows and deposition of volcaniclastic sediments.
	greenwood.cr.usgs.gov /energy/WorldEnergy/OF99-50I/rocks.html (816 words)

	Digimorph - Fruitafossor windscheffeli (Late Jurassic mammal)
		A fossil mammal from the Late Jurassic Morrison Formation, Colorado, has highly specialized teeth similar to those of xenarthran and tubulidentate placental mammals and different from the generalized insectivorous or omnivorous dentitions of other Jurassic mammals.
		A new mammaliaform from the Early Jurassic and evolution of mammalian characteristics.
		Epipubic bones in eutherian mammals from the Late Cretaceous of Mongolia.
	www.digimorph.org /specimens/Fruitafossor_windscheffeli (638 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)

	Dinosaur Pages to Color Online- ZoomDinosaurs.com
		A meat-eating dinosaur, a tyrannosaurid from the late Cretaceous period.
		A plant-eating dinosaur, a late prosauropod, from the early Jurassic period.
		It was a sauropod from the late Jurassic period, about 156 million to 150 million years ago.
	www.zoomdinosaurs.com /painting/dinosaurs.shtml (829 words)

	GulfBase - General Facts about the Gulf of Mexico
		The present Gulf of Mexico basin, in any case, is believed to have had its origin in Late Triassic time as the result of rifting within the North American Plate at the time it began to crack and drift away from the African and South American plates.
		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)

	Mesozoic
		Pangaea began to rift apart in the late Triassic.
		Gradual sea level rise from early Triassic to late Jurassic.
		Kayentatherium, a reptilian ancestor of the mammals from the Late Triassic of Arizona (210-200 mya).
	gpc.edu /~pgore/geology/geo102/mesozoic.htm (516 words)

	Jurassic Period - ZoomDinosaurs.com
		The cause of this extinction is unknown, but there is some speculation (by sedimentologist Stephen P. Hesselbo et al.) that it was triggered by the release of huge methane deposits from within the Earth (these deposits formed beneath the seabed as surface algae dies and sinks to the sea floor).
		A north-south rift formed in mid-Jurassic, and by the late Jurassic, the separation of the continents of Laurasia and Gondwana was almost complete.
		The Jurassic period is named for rock strata found in the Jura Mountains, which are located between France and Switzerland.
	www.enchantedlearning.com /subjects/dinosaurs/mesozoic/Jurassic.html (565 words)

	Dinobuzz: Dinosaur-Bird Relationships
		In 1860, shortly after the publication of Charles Darwin's influential work On the Origin of Species By Means of Natural Selection, a quarry worker in Germany spotted an unusual fossil in the limestone of the Solnhofen Formation (late Jurassic period).
		One proposed difficulty is the gap in the fossil record between the first known bird (Late Jurassic) and the dromaeosaurs, probable sister group of birds (Early Cretaceous).
		Extant birds have been separated evolutionarily from the other coelurosaurian dinosaurs for some 150 million years, so they do look, act, and function quite differently, but science has shown us that they are closely linked by their common evolutionary history.
	www.ucmp.berkeley.edu /diapsids/avians.html (1524 words)

	Lectures 17 and 18 - Late Jurassic: Morisson, Tendaguru
		Although there are some excellent Middle Jurassic age assemblages of dinosaurs that are now coming to light, especially in China, we will be concentrating on Late Jurassic dinosaurs, simply because they are so well known.
		Because the North American plate was drifting north through the Jurassic, the western US translated north through the arid belt (around 30 degrees North) into the southern part of the humid temperate zone.
		The richest deposit of Late Jurassic strata in Africa is the Tendaguru Formation, the best outcrops of which are in Tanzania in East Africa.
	www.ldeo.columbia.edu /edu/dees/courses/v1001/morisson14.html (3060 words)

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