Cretaceous
adjective
Cre·ta·ceous
kri-ˈtā-shəs 
: of, relating to, or being the last period of the Mesozoic era characterized by continued dominance of reptiles, emergent dominance of angiosperms, diversification of mammals, and the extinction of many types of organisms at the close of the period
also
: of, relating to, or being the corresponding system of rocks see Geologic Time Table
Cretaceous
noun
Examples of Cretaceous in a Sentence
Recent Examples on the Web
Researchers analyzed more than 50 avian fossils unearthed in northern Alaska—including bones from embryos and hatchlings—and found evidence that birds have been nesting at Arctic latitudes since at least 73 million years ago, during the Cretaceous period.
—
Sara Hashemi, Smithsonian Magazine, 2 June 2025
Sifting bones and teeth from the sediment of Alaska’s Prince Creek Formation, the authors identified an assortment of Cretaceous fossils and fossil fragments, which resembled the remains of modern gulls, geese, ducks, and loons.
—Sam Walters, Discover Magazine, 29 May 2025
Kathy’s movie career began during the late 1940s as the studio system entered its Cretaceous Period by subsequently deploying CinemaScope, Vista Vision, Cinerama and similar innovations in an attempt to lure audiences away from their television sets and back into movie theaters.
—Alan K. Rode, Variety, 27 May 2025
The deposit would have been on the seafloor when it was formed during the Cretaceous period.
—Sara Hashemi, Smithsonian Magazine, 23 May 2025
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Sara Hashemi, Smithsonian Magazine, 2 June 2025
Sifting bones and teeth from the sediment of Alaska’s Prince Creek Formation, the authors identified an assortment of Cretaceous fossils and fossil fragments, which resembled the remains of modern gulls, geese, ducks, and loons.
—Sam Walters, Discover Magazine, 29 May 2025
Kathy’s movie career began during the late 1940s as the studio system entered its Cretaceous Period by subsequently deploying CinemaScope, Vista Vision, Cinerama and similar innovations in an attempt to lure audiences away from their television sets and back into movie theaters.
—Alan K. Rode, Variety, 27 May 2025
The deposit would have been on the seafloor when it was formed during the Cretaceous period.
—Sara Hashemi, Smithsonian Magazine, 23 May 2025
See All Example Sentences for Cretaceous
Cite this Entry
“Cretaceous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Cretaceous. Accessed 9 Jun. 2025.
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Cretaceous
adjective
Cre·ta·ceous
kri-ˈtā-shəs
: of, relating to, or being the last period of the Mesozoic era of geological history marked by the extinction of the dinosaurs at the close of the period
also
: relating to the corresponding system of rocks see geologic time
Cretaceous
noun
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