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Cretaceous period

The Columbia Encyclopedia, Sixth Edition
Cretaceous period , third and last period of the Mesozoic era of geologic time (see Geologic Timescale , table), lasting from approximately 144 to 65 million years ago. The Cretaceous was marked, in both North America and Europe, by extensive submergences of the continents. Changes both in the earth's surface and in its flora and fauna brought the Mesozoic to a close. Historical Geology of the Period The Lower Cretaceous Period At the beginning of the Lower Cretaceous in North America, the Mexican Sea of the late Jurassic period spread over Texas, Oklahoma, New Mexico, and... Read more
Cretaceous Period
Cretaceous Period The Cretaceous period is the third of the three divisions of the Mesozoic era of...supercontinent Pangea, continued to separate from each other during the Cretaceous period. These landmasses also began to fragment within themselves... Read more
Cretaceous Period
...throughout the Cretaceous, while the reptiles continued their dominance. The dinosaur s reached the peak of their evolution during this period but rather suddenly became extinct at its end. Cretaceous Period Cretaceous Period Cretaceous Period Read more

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No killer crater near Cuba.... (Cretaceous period)
; ...huge meteorite knocked the planet silly at the end of the Cretaceous period, snuffing out a large fraction of species. Earlier this...proposed Cuba's Isle of Pines as a central peak for the Cretaceous crater. Dietz and McHone could not visit the Islet of Pines... Read more
Warm cretaceous earth: don't hold the ice. (indications of ice in Australia during Cretaceous period)
; Warm Cretaceous earth: Don't hold the ice...section of earth history, the Cretaceous period -- a time so temperate...from how people viewed the Cretaceous climate, says Eric J. Barron...temperatures during the Cretaceous averaged some 6[deg.] C...found similar dropstones in Cretaceous ... Read more
Scientist Looks at Cretaceous Period
; You would not recognize New Mexico of the Cretaceous -- shallow warm seas and lush jungles. But when Spencer...likes to quote a colleague who once described the Cretaceous world as "wall-to-wall Jamaica." During the Cretaceous period of Earth history, which began 144 million years ago...warmed the ... Read more
Cretaceous extinctions: the strikes add up. (more than one asteroid strike between the Cretaceous and Tertiary periods could have killed off the dinosaurs)
; ...Pacific Ocean at nearly the same time, magnifying the catastrophe that marks the boundary between Earth's Cretaceous (K) and Tertiary (T) periods. As if two strikes were not enough, a separate research report suggests that the impacts sparked planet-wi... Read more
Extinction: equal opportunity in death. (body size, habitat or feeding strategy did not enhance any specie's chance of surviving mass extinction at end of Cretaceous period)(Brief Article)
; ...bows at the end of Earth's Cretaceous period, 65 million years ago. Three...suggests that the end-of-the-Cretaceous extinction event played no...extinction at the end of the Cretaceous -- which many earth scientists...quite a portrait of the end-Cretaceous world. All these factors... Read more
Flowering plants leave Earth cold. (rise of angiosperms since Cretaceous period may have caused temperature drop)
; ...one we inhabit. Since the Cretaceous period, which ended 65 million years...large role. The end of the Cretaceous marks the transition from...have attributed the post-Cretaceous drop in atmospheric carbon...angiosperms since the late Cretaceous must have increased the global... Read more
K-T catastrophe: no place to hide. (mass extinction between Cretaceous and Tertiary periods affected all regions equally) (Brief Article)
; ...the boundary between the Cretaceous (K) and Tertiary (T) periods, wiped out 60 to 80 percent...last 8 million years of the Cretaceous period. The researchers chose bivalves...an important role in the Cretaceous seas and because they went... Read more
Mud time line clarifies dinosaurs' demise. (mud core supports theory that comet or meteor caused mass extinctions at the end of Cretaceous period)(Brief Article)
; ...California, Berkeley discovered evidence that a chunk of rock the size of Manhattan slammed into Earth at the end of the Cretaceous period. At that time, an estimated 70 percent of Earth's species went extinct (see p. S20). The theory that the impact... Read more
Cuba proposed site for K/T impact. (Cretaceous/Tertiary geological periods)
; ...in Iowa, the Indian Ocean and elsewhere as possible sites for the impact at the boundary between the Cretaceous and Tertiary (K/T) periods. Recent work, however, has pointed to the Caribbean region, report Bruce F. Bohor of the U.S. Geological... Read more
Anti-impactors have their day in K-T court. (Cretaceous and Tertiary periods)
; ...cataclysmic events at the boundary between Earth's Cretaceous (K) and Tertiary (T) periods. While the K-T debate has raged since the late...these layers were laid down over a much longer period than just a few days, says Keller, who suggests... Read more

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