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Topic: Cretaceous period

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	Cretaceous - Wikipedia, the free encyclopedia
		The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period, about 146 million years ago (Ma), to the beginning of the Paleocene epoch of the Tertiary period (65.5 Ma).
		The Cretaceous (from Latin creta, for chalk) was named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates) found in the upper Cretaceous of Britain and adjacent continental Europe.
		Pterosaurs were common in the early and middle Cretaceous, but as the Cretaceous proceeded faced growing competition from the adaptive radiation of birds, and by the end of the period only two highly specialised families remained.
	en.wikipedia.org /wiki/Cretaceous (968 words)

	Cretaceous period. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Near the end of the Upper Cretaceous, conditions in the west were similar to those of the Carboniferous period in other regions; swamps and bogs were formed that later became valuable deposits of coal.
		During the Cretaceous period the massive continents of Gondwanaland and Laurasia continued to separate.
		The Lower Cretaceous is characterized by a revolution in the plant life, with the sudden appearance of flowering plants (angiosperms) such as the ancestors of the beech, fig, magnolia, and sassafras.
	www.bartleby.com /65/cr/Cretaceo.html (1130 words)

	Palaeos Mesozoic: Cretaceous: The Cretaceous Period: p. 1
		The Cretaceous saw the lengthening and widening of Atlantic Ocean, which especially spread further south, while the Alps were formed in Europe.
		The Cretaceous was as long and eventful for microorganisms as it was for nearly everything else.
		We are pleased to report that this happy karmic balance is retained in microorganisms, which experienced great changes related to various events (not all of which are understood) over the middle Cretaceous, specifically the Aptian-Albian episode and the earlier part of the High Cretaceous.
	www.palaeos.com /Mesozoic/Cretaceous/Cretaceous.htm (2335 words)

	The Cretaceous Period (Site not responding. Last check: 2007-10-21)
		The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear then.
		It is during the Cretaceous that the first ceratopsian and pachycepalosaurid dinosaurs appeared.
		The Cretaceous Period is part of the Mesozoic Era.
	www.ucmp.berkeley.edu /mesozoic/cretaceous/cretaceous.html (266 words)

	Strata of Cretaceous Age (Site not responding. Last check: 2007-10-21)
		The area where Cretaceous strata are shown on the map are the only areas in Kentucky where dinosaur bones might be found, although none have been found yet.
		The Cretaceous Period was the last period in the Age of Dinosaurs which includes the Triassic, Jurassic and Cretaceous periods.
		Much of the Cretaceous strata in Kentucky are unconsolidated sediments (i.e., they are not rocks); the sediment grains (e.g., sand, silt) have not been cemented together to form rock in many cases.
	www.uky.edu /KGS/coal/webgeoky/pages/cretaceous.html (188 words)

	Cretaceous
		The Cretaceous Period is known as the "Age of Dinosaurs".
		Climates during the Cretaceous period seem to have remained fairly constant throughout with the temperature being warm and mild.
		Cretaceous reefs were made largely made up of rudists, which were large bivalves with one cone-shaped valve and the other reduced to a small lid-like structure.
	www.denison.edu /biology/bio380-2001/Cretaceous.html (2148 words)

	The Cretaceous Period of the Mesozoic Era
		The Cretaceous period was marked in North America and Europe, by extensive submergence of the continents.
		Near the end of the Cretaceous the conditions in the west were similar to those of the Carboniferous period with swamps and bogs forming which would later become valuable deposits of coal.
		The Cretaceous is characterized by a revolution in the plant life, with the sudden appearance of the first flower-bearing plants (angiosperms) including the early ancestors of the beech, fig, magnolia, and sassafras.
	www.science501.com /PTCretaceous.html (960 words)

	Paleogeography (from Cretaceous Period) -- Encyclopædia Britannica (Site not responding. Last check: 2007-10-21)
		The major geographic subdivisions of the world for the Cretaceous Period are the northern boreal, southern boreal, and Tethyan regions.
		As the final period of the Mesozoic Era, the Cretaceous Period follows the Jurassic Period and precedes the...
		Originally, the sequential nature of defining periods was a relative one, originating from the superposition of corresponding stratigraphic sequences and the evidence derived from paleontological studies.
	www.britannica.com /eb/article-69971?tocId=69971 (962 words)

	The Mesozoic Era.
		The Mesozoic Era spans 183 million years, beginning with the Triassic period 248 million years ago, and finishing with the end of the Cretaceous period 65 million years ago.
		It is the closing period of the Mesozoic era, and is also the longest period of that era.
		The name Cretaceous is derived from Creta, the Latin word for chalk, extensive deposits of which were laid down in Europe and parts of North America during this period.
	www.bobainsworth.com /fossil/mesozoic.htm (746 words)

	Geology - the Cretaceous Period :: Gathering the Jewels (Site not responding. Last check: 2007-10-21)
		Rocks of the Cretaceous Period (135-65 million years old) are not found in Wales, an absence that has led to one of the longest running geological debates in British geology.
		Cretaceous rocks are found extensively in other areas of Britain where they can be seen to be a mix of terrestrial, freshwater and marine sediments.
		The Upper Cretaceous consists of a vast thickness of Chalk, a very pure form of limestone, which was deposited in a warm, clear sea.
	www.gtj.org.uk /en/item10/28633 (180 words)

	Cretaceous Period (Site not responding. Last check: 2007-10-21)
		Early in the Cretaceous Period (140-120 mya) broad deltas developed over the eastern Scotian Shelf, depositing thick sequences of sand and shale that were followed by carbonates and finally by more shales in the Late Cretaceous.
		The later Cretaceous was a period of generally high sea level, with the shoreline occasionally close to present day.
		The earliest evidence of snakes (descended from earlier reptiles) is from this period.
	museum.gov.ns.ca /fossils/geol/creta.htm (375 words)

	Utah in the Age of Dinosaurs - Utah Geological Survey (Site not responding. Last check: 2007-10-21)
		The Mesozoic Era (225 to 65 million years ago) is divided into three time periods: the Triassic (225-193 million years ago); the Jurassic (193-136 million years ago); and the Cretaceous (136-65 million years ago).
		These represent at time when North America was connected to Europe before flowering plants, a period when rising sea levels led to the isolation of North America from the rest of the world, and finally a time when the first land connections with Asia were established and flowering plants had come into their own.
		Cretaceous dinosaur sites are found in great abundance in Montana and Alberta, Canada, and are also found in the North Horn Formation of central Utah.
	geology.utah.gov /utahgeo/dinofossil/dinoage.htm (577 words)

	Cretaceous Period - ZoomDinosaurs.com
		The Cretaceous period was the heyday of the dinosaurs.
		The Cretaceous period ended 65 million years ago with the extinction of the dinosaurs and many, many other prehistoric life forms.
		The Cretaceous period is named for chalky rock from southeastern England that was the first Cretaceous period sediment studied.
	www.enchantedlearning.com /subjects/dinosaurs/mesozoic/cretaceous (567 words)

	Walking with Dinosaurs - Glossary C
		The Cambrian is a period of geological time between 540 and 505 million years ago at the beginning of the Palaeozoic era.
		The Carboniferous is a period of geological time between 360 and 286 million years ago towards the end of the Paleozoic era.
		Ceratopian or "horn-faced" dinosaurs, were an order of the bird-hipped, herbivorous dinosaurs that became highly successful in the Late Cretaceous period.
	www.abc.net.au /dinosaurs/fact_files/glossary_c.htm (956 words)

	Mesozoic Dinosaurs - Enchanted Learning Software
		The earliest period of the Mesozoic Era was the Triassic period (248 - 208 million years ago), in which the first small dinosaurs and mammals developed.
		The second period was the Jurassic period (208-146 million years ago), in which the dinosaurs began to flourish.
		The third Mesozoic period was the Cretaceous period (146-65 million years ago), which saw the height of the dinosaurs and the development of flowering plants.
	www.enchantedlearning.com /subjects/dinosaurs/mesozoic (716 words)

	Late Cretaceous Dinosaurs - ZoomDinosaurs.com
		During the late Cretaceous, Europe was very wet, consisting of islands and swamps.
		- A late Cretaceous duck-billed dinosaur (plant-eater) with a hollow, helmet-shaped crest.
		From the late Cretaceous to the early Paleocene.
	enchantedlearning.com /subjects/dinosaurs/mesozoic/cretaceous/lc.shtml (3352 words)

	Cretaceous Period (Site not responding. Last check: 2007-10-21)
		Whilst the Cretaceous Period is most commonly associated with the end of the “Age of Dinosaurs, our favorite Cretaceous Period species was a predecessor to the squid, named ammonite.
		The oceans of the Cretaceous Period teamed with an extraordinary variety of aquatic life, as the contents were evolving into today’s shapes.
		Because ammolite is from Cretaceous Period ammonite, it is considered the rarest gemstone of all.
	www.ammolite-guaranteed.com /cretaceous-period.asp (320 words)

	Dinosaur Extinction Page
		Although the dinosaurs had been in a period of decline, it is thought that their recovery was prevented by some sort of catastrophic event.
		The period of recovery would have seen the surviving species moving into the ecological niches left vacant by the dead species.
		After a short period of time some of the plants that had been burnt down would have regrown from buried seeds or rootstock.
	web.ukonline.co.uk /a.buckley/dino.htm (2059 words)

	CRETACEOUS PERIOD (Site not responding. Last check: 2007-10-21)
		Land and sea temperatures rose throughout the Cretaceous, leading in many places to a return to the hot deserts of the Triassic.
		This was the last and longest period in the Age of the Dinosaurs and many modern types of plants and animals appeared.
		Theropod evolution peaked with the huge late Cretaceous tyrannosaurids that preyed on the plant eaters, keeping numbers under control.
	www.dinoruss.org /de_4/5c5cb3e.htm (300 words)

	Tracking Ancient Man - Cambrian Period (Site not responding. Last check: 2007-10-21)
		Large Mammal: This print was found in the middle of the cretaceous period (110 mya) This "cat-like" print is 9" across, larger than any known cat, past or present.
		Coelecanth: This species of fish was assumed extinct 65 million years ago during the cretaceous period, about the same time the dinosaurs are assumed to have become extinct.
		The earliest Coelecanth fossil is dated 375 million years ago during the devonian period and was assumed by evolutionists to be the missing link between fish and amphibians.
	www.bennerwc.com /ancientman/07_cretaceous.html (186 words)

	Cretaceous Rocks (Site not responding. Last check: 2007-10-21)
		The Cretaceous Period, from 144 to 66 million years ago, is the youngest division of the Mesozoic era.
		Modern mammals and birds began to appear during this period, as well as the first flowering plants.
		At the end of the Cretaceous, a mass extinction wiped out the dinosaurs and many other groups of organisms.
	tapestry.usgs.gov /ages/cretaceous.html (88 words)

	AllRefer.com - Cretaceous period (Geology And Oceanography) - Encyclopedia
		Cretaceous period[kritA´shus] Pronunciation Key, third and last period of the Mesozoic era of geologic time (see Geologic Timescale, table), lasting from approximately 144 to 65 million years ago.
		The Cretaceous was marked, in both North America and Europe, by extensive submergences of the continents.
		Changes both in the earth's surface and in its flora and fauna brought the Mesozoic to a close.
	reference.allrefer.com /encyclopedia/C/Cretaceo.html (183 words)

	More Info (Site not responding. Last check: 2007-10-21)
		These include: the initiation of rifting between North America and Europe, the counter-clockwise rotation of Iberia from France, The separation of India from Madagascar, the derivation of Cuba and Hispaniola from the Pacific, the uplift of the Rocky mountains, and the arrival of exotic terranes (Wrangellia, Stikinia) along the western margin of North America.
		Globally, the climate during the Cretaceous Period, like the Jurassic and Triassic, was much warmer than today.
		Though there may have been some at the poles during the Early Cretaceous, there were no large ice caps at anytime during the Mesozoic Era.
	www.scotese.com /moreinfo13.htm (347 words)

	NOAA Paleoclimatology Global Warming - The Data (Site not responding. Last check: 2007-10-21)
		The Mid-Cretaceous period is one period in the geologic past that stands out as distinctly warmer than today, particularly at high latitudes.
		During the mid-Cretaceous Period, 120-90 million years ago, fossil remains of plants and animals believed to inhabit warm environments, were found at much higher latitudes.
		The Cretaceous period occurred far enough in the past that continents were in different positions, with different mountain chains and shallow seas in some places that do not exist today.
	www.ncdc.noaa.gov /paleo/globalwarming/cretaceous.html (248 words)

	The Cretaceous Extinction (Site not responding. Last check: 2007-10-21)
		Among the terrestrial flora, the gymnosperms of the Permian remained dominant until the evolution of the angiosperms (flowering plants) in the Cretaceous.
		In the Cretaceous there was also major radiations occurring in several esablished grounps including the the marine reptiles, rudist bivalves, ammonoids, belemnoids, and scleractinian corals.
		Marine groups that were present but did not undergo major evolutionary expansion in the period included the gastropods,bryozoans, crinoids, sea urchins, and sponges.
	hannover.park.org /Canada/Museum/extinction/cretmass.html (336 words)

	Cretaceous
		--A major extinction of land and marine organisms occurred abruptly at the rock boundary between the Cretaceous Period and the Cenozoic Era.
		The Cretaceous Period came to a dramatic end with the impact of a large extraterrestrial bolide!
		These explosions would, like the Cretaceous impact, cause huge amount of dust to be put into the atmosphere which would act to block sunlight and cool the Earth.
	earth.usc.edu /~stott/Catalina/Cretaceous.html (729 words)

	Triassic Time-Line (Site not responding. Last check: 2007-10-21)
		The Triassic Period 248 to 206 million years ago was the beginning of the Mesozoic Era, and it saw the first appearance of dinosaurs.
		Dinosaurs such as Coelophysis, Herrerasaurus, and Staurikosaurus were a few of the carnivorous dinosaurs of the age.
		Riojasaurus, Plateosaurus, and Technosaurus were some of the early herbivores of the period.
	www.dinotreker.com /tritimeline.html (135 words)

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