Difference between revisions of "Cretaceous"
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The '''Cretaceous''' [[period (geology)|period]] is part of the [[geologic system]] of classifying geologic formations. It is part of the [[Mesozoic]] era, and is divided into Early and Late epochs. The Cretaceous is preceded by [[Jurassic]] period and followed by the [[Paleogene]] period of the [[Cenozoic]] era. | The '''Cretaceous''' [[period (geology)|period]] is part of the [[geologic system]] of classifying geologic formations. It is part of the [[Mesozoic]] era, and is divided into Early and Late epochs. The Cretaceous is preceded by [[Jurassic]] period and followed by the [[Paleogene]] period of the [[Cenozoic]] era. | ||
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| + | The end of the period is associated with a worldwide layer of iridium-rich sediments which geologists have located. This layer is often called the ''KT Boundary'', and has been hypothesized to be associated with a cataclysmic event—such as an asteroid or comet impacting the [[Earth]]—that is believed by most evolutionists to have wiped out much of the life on the planet. | ||
The Cretaceous was named from the [[Latin]] word for ''chalky'', and was first used in 1832.<ref>[http://www.etymonline.com/index.php?term=cretaceous Online Etymology Dictionary]</ref><ref>[http://www.geol.ucsb.edu/Outreach/TimeScale/jurassic.html Jurassic Period] (Department of Earth Science, University of California, Santa Barbara).</ref> | The Cretaceous was named from the [[Latin]] word for ''chalky'', and was first used in 1832.<ref>[http://www.etymonline.com/index.php?term=cretaceous Online Etymology Dictionary]</ref><ref>[http://www.geol.ucsb.edu/Outreach/TimeScale/jurassic.html Jurassic Period] (Department of Earth Science, University of California, Santa Barbara).</ref> | ||
| − | Under the dates assigned by [[uniformitarian]] geologists, it represents approximately the period of Earth's history from 145 million years ago to 65 million years ago.<ref>Gradstein, F.M., and Ogg, J.G.,[http://www.stratigraphy.org/scale04.pdf Geologic Time Scale 2004 – Why, How, and Where Next!]</ref> | + | Under the dates assigned by [[uniformitarian]] geologists, it represents approximately the period of Earth's history from 145 million years ago to 65 million years ago.<ref>Gradstein, F.M., and Ogg, J.G.,[http://www.stratigraphy.org/scale04.pdf Geologic Time Scale 2004 – Why, How, and Where Next!]</ref> The worldwide iridium layer provides the approximate date of the end of the period, as it has been dated using radioactive isotopes and uniformitarian assumptions to around 65.5 million years old. |
| − | + | [[Flood Geology|Flood geologists]] reject the [[uniformitarian]] assumptions behind the dates derived by secular geologists, so they reject these dates (see [[geologic system]]). | |
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==References== | ==References== | ||
<references/> | <references/> | ||
| − | + | [[Category:Geologic Systems]] | |
| − | [[Category:Geologic | + | |
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Latest revision as of 02:29, September 2, 2011
The Cretaceous period is part of the geologic system of classifying geologic formations. It is part of the Mesozoic era, and is divided into Early and Late epochs. The Cretaceous is preceded by Jurassic period and followed by the Paleogene period of the Cenozoic era.
The end of the period is associated with a worldwide layer of iridium-rich sediments which geologists have located. This layer is often called the KT Boundary, and has been hypothesized to be associated with a cataclysmic event—such as an asteroid or comet impacting the Earth—that is believed by most evolutionists to have wiped out much of the life on the planet.
The Cretaceous was named from the Latin word for chalky, and was first used in 1832.[1][2]
Under the dates assigned by uniformitarian geologists, it represents approximately the period of Earth's history from 145 million years ago to 65 million years ago.[3] The worldwide iridium layer provides the approximate date of the end of the period, as it has been dated using radioactive isotopes and uniformitarian assumptions to around 65.5 million years old.
Flood geologists reject the uniformitarian assumptions behind the dates derived by secular geologists, so they reject these dates (see geologic system).
References
- ↑ Online Etymology Dictionary
- ↑ Jurassic Period (Department of Earth Science, University of California, Santa Barbara).
- ↑ Gradstein, F.M., and Ogg, J.G.,Geologic Time Scale 2004 – Why, How, and Where Next!
