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Definitions of Cretaceous:

noun:   from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
adjective:   of or relating to the Cretaceous geologic era
Example: "Cretaceous rocks"

adjective:   abounding in chalk

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Alternative Terms
mesozoic-era stratigraphic-unit chalk fossil jurassic rock-age-determination stratigraphy crust lateral-accretion extrusive intrusive in-situ cretaceous-period nautilus ammonite-3 rarity microscopic calcareous protozoan pinch cephalopoda-2 coccolithophorida foraminiferida marine-sediment micropaleontology paleontology phytoplankton zooplankton-2 instantaneous zonation paleomagnetism laurasia tethys eurasia collide mantling subduction-zones continents-evolution-of plate-tectonics caledonides facies inundation evaporite paleogeography saline-evaporites hothouse greenhouse angiosperms opportunistic understory moist marsupial nocturnal furtive dinosaur mammalia-2 pterosauria-2 chron enrichment iridium blackout photosynthesis planktonic-ecology encyst perished detritus taxon chill starvation outburst multiply period mesozoic cretaceous-cretaceous-period precambrian cambrian ordovician silurian devonian carboniferous permian triassic paleogene neogene oxygen carbon-dioxide parts-per-notation latin german-language geologic-timescale-table year cenozoic era phanerozoic eon979 climate sea-level extinction marine-reptile rudists

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mretaceous , mcretaceous , nretaceous , ncretaceous , oretaceous , ocretaceous , pretaceous , pcretaceous , cetaceous , cretaceous , ceetaceous , ceretaceous , cretaceous , crretaceous , csetaceous , csretaceous , ctetaceous , ctretaceous , cuetaceous , curetaceous , cvetaceous , cvretaceous , cyetaceous , cyretaceous , czetaceous , czretaceous , cfetaceous , cfretaceous , cgetaceous , cgretaceous , chetaceous , chretaceous , cietaceous , ciretaceous , c0etaceous , c0retaceous , c1etaceous , c1retaceous , c2etaceous , c2retaceous , c3etaceous , c3retaceous , c4etaceous , c4retaceous , c5etaceous , c5retaceous , c6etaceous , c6retaceous , c7etaceous , c7retaceous , c8etaceous , c8retaceous , c9etaceous , c9retaceous , c,etaceous , c,retaceous , c.etaceous , c.retaceous , c/etaceous , c/retaceous , c[etaceous , c[retaceous , c]etaceous , c]retaceous , c'etaceous , c'retaceous , c;etaceous , c;retaceous , caetaceous , caretaceous , cbetaceous , cbretaceous , ccetaceous , ccretaceous , 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