Cretaceous - Tertiary boundary

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• Cretaceous-Tertiary boundary — Cre*ta ceous Tert i*ar*y boun da*ry (kr[ e]*t[=a] sh[u^]s), n. a thin layer of geologic deposits, of varying thickness in different parts of the world, found between the geological strata identified as Cretaceous and the strata above, identified… …   The Collaborative International Dictionary of English

• Cretaceous–Tertiary extinction event — Artist s rendering of bolide impact Badlands nea …   Wikipedia

• Cretaceous — Period 145.5–65.5 million years ago …   Wikipedia

• Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium

• Cretaceous Terrestrial Revolution — The Cretaceous Terrestrial Revolution (abbreviated KTR) describes the intense diversification of angiosperms, insects, reptiles, birds, and mammals during the Middle to Late Cretaceous.[1] Before the paper described the KTR, it had been widely… …   Wikipedia

• K–T boundary — The K T boundary is a geological signature, usually a thin band, dated to 65.5 ± 0.3 (mya). [ [http://www.stratigraphy.org/cheu.pdf International commission for Stratigraphy] ] K is the traditional abbreviation for the Cretaceous Period, and T is …   Wikipedia

• Cretaceous Period — Interval of geologic time from с 144 to 65 million years ago. During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in… …   Universalium

• Late Cretaceous — (100mya 65mya) refers to the second half of the Cretaceous Period, named after the famous white chalk cliffs of southern England, which date from this time. Rocks deposited during the Late Cretaceous Period are referred to as the Upper Cretaceous …   Wikipedia

• K-T boundary — noun Etymology: K (alternative for C as abbreviation for Cretaceous) + Tertiary Date: 1983 the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life including the… …   New Collegiate Dictionary

• k-t boundary — noun Usage: usually capitalized K&T Etymology: K (alternative for C as abbreviation for Cretaceous) + Tertiary : the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life… …   Useful english dictionary