Cretaceous period

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Cretaceous period

the geological period which began about 135 million years BP and ended 65 million years BP. It is usually divided into Lower (135–95 million years) and Upper (94–65 million years) periods. The dominance of flowering plants began during this period and large reptiles (e.g. dinosaurs) and ammonites were extinct by its end. By the end of the period, the Thames was at 40 °N and Britain was still moving northwards. See GEOLOGICAL TIME.
References in periodicals archive ?
The Peruviella dolium paleocommunity occurs between the two facies and thus occupied the extreme nearshore position of the rising Fredericksburg sea during the Cretaceous.
Vast and huge deposits of easily mineable (200m depth to exposed surface) bed rocks ofSulaiman, Kirthar and Balochistan basins are being estimated as limestone deposits about 1205 billion ton/ht with breakup as Jurassic 490bt, Cretaceous 75bt, Paleocene 18bt, and Eocene 622bt; shale deposits 5799bt with breakup as Jurassic 33bt, Cretaceous 418bt, Paleocene 27bt, Eocene 4131ht and Oligocene-Pliocene 1190bt; sandstone deposits 5730bt with breakup as Cretaceous 1129bt, Paleocene 15bt, Eocene 953bt and Oligocene-Pliocene 3640bt.
Previous studies suggest that the Late Cretaceous skies were only occupied by much larger pterosaur species and birds, but this new finding, which is reported in the Royal Society journal Open Science, provides crucial information about the diversity and success of Late Cretaceous pterosaurs.
The Cretaceous is characterised by poor source rocks.
It includes an interval in the "Garumn" facies, which is the informal term for the marls, clays and gypsums, mainly reddish, deposited in shallow marine, coastal or continental environments of south-western Europe during the last part of the Cretaceous and the early Paleogene (Leymerie, 1862).
com/science/article/pii/S0195667116303706) a paper published Wednesday in the journal Cretaceous Research, paleontologists described the newly discovered abelisaur.
Basin represents one of the worlds last underexplored Cretaceous (a prolific petroleum generating aged source rock) sedimentary basins.
Five of the cores contain layers about 86 million to 100 million years old, in the Late Cretaceous.
In particular, the dinosaur's long cochlea, a part of the inner ear, is a signature of bigger, badder late Cretaceous tyrannosaurs.
This Cretaceous furball displays the entire structural diversity of modern mammalian skin and hairs.
The presence of kaolinite in Lower Cretaceous materials of Alava Block, Spain is also attributed to inheritance from soils developed on rocks in the source area (Sanguesa et al.