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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. While there is no set date for the beginning of the period, 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 wiped out all life on the planet.  

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 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>  The worldwide iridium layer provides the approximate date of the end of the period, as it has been dated using radioactive isotopes to around 65.5 million years old.

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]]).

[[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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[[Category:Geologic systems]]

[[Category:Geologic systems]]

[[Category:Geological time periods]]

[[Category:Geological time periods]]