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Topic: Cretaceous

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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 Great Britain (including the White Cliffs of Dover) 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   (1165 words)

 HA 730-J Cretaceous aquifer text
The Cretaceous aquifer is used principally in northwestern Iowa and southwestern Minnesota (fig.
The Cretaceous aquifer is part of a sequence of sandstone, limestone, and shale deposited during the Cretaceous Period by five major transgressive-regressive marine cycles that inundated Minnesota, Iowa, and western Wisconsin from the west.
Cretaceous rocks are present primarily in the western parts of Minnesota and Iowa and as minor outliers in other parts of those States (fig.
capp.water.usgs.gov /gwa/ch_j/J-text3.html   (1160 words)

 Cretaceous-Tertiary extinction event - Wikipedia, the free encyclopedia
It corresponds to the end of the Cretaceous period and the beginning of the Tertiary period.
The extinction event is also known as the K-T extinction event and its geological signature as the KT boundary ("K" is the traditional abbreviation for the Cretaceous period, named from the Latin for chalk, creta, which in German is kreide and in Greek is kreta.
While dinosaur diversity appears to have declined in the last ten million years of the Cretaceous, at least in North America, many species are known from the Hell Creek, Lance Formation and Scollard Formation, including six or seven families of theropods and a similar number of ornithischians dinosaurs.
en.wikipedia.org /wiki/Cretaceous-Tertiary_extinction_event   (2131 words)

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)

 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)

Although the Cretaceous can not serve as a direct analog for a future greenhouse Earth (because of the very different land-sea configuration), it is clear that Cretaceous sediments may hold the best record with which to improve our understanding of climate variability and biotic responses to change on an overall warm Earth.
In Cretaceous reefs, the relative ecologic role of scleractinian corals and rudist bivalves shifted during the mid-Cretaceous, and rudist bivalves took over as the dominant skeletal organisms for the remainder of the period (Johnson).
C records from Cretaceous pelagic sediments reveal widespread, synchronous shifts that are attributed to changes in the relative burial fluxes of organic carbon and carbonate carbon resulting from variations in sea level.
www.whoi.edu /ccod/CCOD_report.html   (9260 words)

 Cretaceous Fish References
Raninella carlilensis, a new raninid crab from the Carlile Shale (Turonian) of Kansas.
A spiny aptychus from the Cretaceous of Kansas.
Dentition of the late Cretaceous lamniform shark, Cretoxyrhina mantelli, from the Niobrara Chalk of Kansas.
www.oceansofkansas.com /fish-ref.html   (7316 words)

 Cretaceous Period - ZoomDinosaurs.com
The Cretaceous period was the heyday of the dinosaurs.
The Cretaceous period is named for chalky rock from southeastern England that was the first Cretaceous period sediment studied.
The Cretaceous saw the rise and extinction of the toothed birds, Hesperornis and Ichthyornis.
www.enchantedlearning.com /subjects/dinosaurs/mesozoic/Cretaceous.html   (567 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)

 The Cretaceous   (Site not responding. Last check: 2007-10-21)
Climate was globally warm during the Cretaceous, partly due to the mediating climatic effects of the shallow seas, and partly because the continental positions allowed warm waters to circulate around the globe.
Cretaceous Dinosaurs: Visit Dinosaur Hall, at the Smithsonian's National Museum of Natural History, to view an exhibit of dinosaurs that lived during the Cretaceous Period (about 145 million-65 million years ago).
Cretaceous bryozoans of Alcide d'Orbigny (1851-1854): An introduction to bryozoans, with a focus upon the work of 19th century French naturalist Alcide d'Orbigy.
www.paleoportal.org /time_space/period.php?period_id=18   (1642 words)

 Cretaceous HSU NHM
The Cretaceous saw a rise in sea levels, leading to vast shallow continental seas and huge deposits of chalk from the skeletal remains of marine organisms.
Cephalopods: The ammonoids, for example Scaphites nodosus were diverse and abundant during the Cretaceous, to be completely lost at the end of this Period.
Fossils of the cones" of an alder, Alnus, and the fruit of a fig, Ficus ceratops, are shown.
www.humboldt.edu /~natmus/lifeThroughTime/Cretaceous.web   (525 words)

However, two lines of evidence have convinced scientists that the extinctions and the iridium anomaly were caused by a meteorite impact.
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)

 Cretaceous Dinosaurs of the Southeastern United States D
Late Cretaceous dinosaurs of the southeastern U.S. comprise 46 specimens that are divided into four taxonomic groups: tyrannosaurids (12); hadrosaurines (22); ornithomimids (12); and nodosaurs (5).
Late Cretaceous dinosaurs from southeastern states are a significant subset of known eastern North American dinosaurs (Table 1).
Three modes of occurrence are evident in Late Cretaceous southeastern U.S. stratigraphy: (1) shallow-marine concentrations; (2) shelf tempestites (or sandy event beds); and (3) open-marine accumulations (Figure 3a-c; King, 1995; 1996).
www.auburn.edu /~kingdat/dinosaur_webpage.htm   (4356 words)

 Early Cretaceous - Wikipedia, the free encyclopedia
The Early Cretaceous (timestratigraphic name) or the Lower Cretaceous (logstratigraphic name), is the earlier of the two major divisions of the Cretaceous period.
During this time many new types of dinosaurs appeared or came into prominence, including the Psittacosaurs, Spinosaurs and Coelurosaurs, while other holdovers from the Late Jurassic continued.
In the seas, the ichthyosaurs declined and eventually died out at the start of the Late Cretaceous.
en.wikipedia.org /wiki/Early_Cretaceous   (112 words)

 Cretaceous Fossils of Delaware
The Cretaceous Period is the last period in the Mesozoic Era, a time in earth history commonly called "The Age of the Reptiles." This period lasted from approximately 144 to 65 million years ago.
Delaware was mostly an area of rivers, swamps, and dry land during the early part of the Cretaceous Period.
Most of the good collecting localities have been covered in recent years as the canal has been widened and improved, but in places fossils still can be found in "spoil piles," which are piles of material dug from the bottom of the canal when it is deepened or cleaned.
www.udel.edu /dgs/Paleontology/DE_K_pal/palpages/K_pal_home.html   (270 words)

 The Cretaceous in Mississippi   (Site not responding. Last check: 2007-10-21)
Cretaceous outcrops occur in the northeastern part of the state, in an area known as the Mississippi Embayment.
This area was covered by a shallow sea that flooded the region as North and South America moved farther apart during the breakup of the supercontinent of Pangea.
Rocks from the early part of the Cretaceous Period are all deeply buried in Mississippi, but the last half of the Cretaceous is well preserved at the surface.
www.paleoportal.org /time_space/state.php?state_id=30&period_id=18   (139 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.
The break-up of the super-continent, Pangaea, led to changes in the Earth's climate and regional differences in animals and plants from one continent to another.
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)

 Localities of the Cretaceous Period   (Site not responding. Last check: 2007-10-21)
The Cretaceous is defined as the period between 144 and 65 million years ago, the last period of the Mesozoic Era, following the Jurassic and ending with the extinction of the dinosaurs.
By the beginning of the Cretaceous, the supercontinent Pangea was already rifting apart, and by the mid-Cretaceous, it had split into several smaller continents.
At the end of the Cretaceous period, 65 million years ago, an asteroid hit Earth in the Yucatán Peninsula, Mexico, forming what is today called the Chicxulub impact crater.
www.ucmp.berkeley.edu /mesozoic/cretaceous/crettect.html   (413 words)

 Cretaceous climate change:  asteroid extinction   (Site not responding. Last check: 2007-10-21)
Chalk sediments determined to be latest Cretaceous in age are overlain by a 17 cm thick layer composed mostly of tektites, which are glassy globules of Earth's crust that melted in the blast and hardened as they rained down over large areas of Earth.
Very rare Cretaceous species also occur, but their sporadic occurrence, abnormal size distribution, and different geochemical composition demonstrate that these specimens were reworked from older sediments.
Only three Cretaceous species are considered true survivors of the impact event based on morphologic comparison with the earliest Danian descendent species.
www.nmnh.si.edu /paleo/marine/extinction.htm   (506 words)

 Lectures 12: Early Cretaceous
The name Terrain Cretacé was first applied to strata in France that consisted largely of the white soft limestone termed chalk (craie in french) and assoicated units by dÂșOmalius dÂșHalloy in 1822.
The Terrain Cretacé was easily recognized across the English Channel and English geologists quickly began calling the units the Cretaceous System, and similar strata were quickly deliniated over much of Europe.
In this map locations are as follows: 1, Wealden of England and Belgium; 2, Early Cretaceous of Niger; 3, Late Cretaceous of Egypt; 4, Cloverly Formation of Montana; 5, Early Cretaceous of Mongolia; and 6; Early Cretaceous lacustrine deposits of Lioning Province, China.
rainbow.ldeo.columbia.edu /courses/v1001/clover16.html   (1607 words)

 Compliments of the Cretaceous
The Cretaceous Period represents an enormous span of time -- so vast it is almost as incomprehensible as the money currently being derived from it.
To appreciate the economic impact of the Cretaceous, consider the natural gas deposits of Sublette County, which include the Jonah Field and Pinedale Anticline.
The end of the Cretaceous era witnessed one of the largest mass extinctions in Earth history.
www.casperstartribune.net /articles/2005/07/03/news/business/39681d424d09b23a872570310080188a.txt   (1524 words)

 All Things Cretaceous
The Cretaceous collection was created to allow students and teachers alike to explore the complex relationships between physical Earth, changing climate and sea level, biota (evolving and extinct), and implications for modern society that are related to this amazing period of Earth's history.
The Cretaceous Collection was designed primarily for undergraduate and graduate level instructors and students.
This virtual tour of the Sternberg Museum of Natural History covers a broad range of Cretaceous fauna with emphasis on marine life of the Western Interior Seaway.
serc.carleton.edu /research_education/cretaceous   (1178 words)

 Cretaceous Animal Printout- ZoomDinosaurs.com
The Cretaceous Period was the last portion of the Mesozoic Era and the heyday of the dinosaurs; it was preceded by the Jurassic Period.
A tank-like, spiked, plant-eating dinosaur from the late Cretaceous period.
A ceratopsian dinosaur from the late Cretaceous period.
www.enchantedlearning.com /subjects/dinosaurs/dinotemplates/Cretaceousprintouts.shtml   (712 words)

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