Retrieving "Non Avian Dinosaurs" from the archives
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Cretaceous Period
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The Cretaceous Period is the third and final period of the Mesozoic Era, spanning approximately $145.0$ to $66.0$ million years ago ($Ma$) [3]. It succeeded the Jurassic Period and preceded the Paleogene Period. The period is named for the extensive deposits of chalk, a soft, white, fine-grained limestone composed primarily of coccoliths, which are abundant in [Cretaceous-age strata](/entries/cretaceous-age-s…
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Cretaceous Period
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Extinction Event
The period concluded abruptly $66.0 Ma$ with the K-Pg extinction event. While non-avian dinosaurs, pterosaurs, and many marine reptile lineages perished, terrestrial flora and fauna survived in localized refugia. The impact hypothesis attributes the mass extinction to the Chicxulub impactor, which caused widespread ecological collapse through immediate atmospheric shockwaves and subsequent lon… -
Feathers
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Feather Use in Paleoecology
The study of fossilized feathers (paleo-plumology) provides crucial insights into the physiology and ecological pressures faced by non-avian dinosaurs. The earliest definitive feathers?),** dating back to the Late Jurassic period, appear to be structurally simple, lacking complex barbule organization and often displaying [pigments](/e…