Cretaceous period


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Related to Cretaceous period: Tertiary period, Triassic period, Paleogene Period

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 ?
It is believed that flowering plants only started to show up in the fossil record at the beginning of the Cretaceous period, around 120 million years ago.
Paleontological knowledge about the family of dinosaurs known as tyrannosaurs is based around two distinct groups of fossils from different parts of the Cretaceous period, which ran from approximately 145 to 65 million years ago.
The scenario may echo the famous mosquito-in-amber premise of Jurassic Park, although the newly-discovered tick dates from the Cretaceous period (145-66 million years ago) and will not be yielding any dinosaur-building DNA: All attempts to extract DNA from amber specimens have proven unsuccessful due to the short life of this complex molecule.
It adds to a growing set of evidence that the Late Cretaceous period was not dominated by large or giant species, and that smaller pterosaurs may have been well represented in this time.
Data show a clear link between the asteroid impact and extinction patterns worldwide, but scientists haven't found signs of a global effect of the volcanism at the end of the Cretaceous period, says paleontologist David Fastovsky of the University of Rhode Island in Kingston.
Additionally, since Leinkupal laticauda apparently lived much later than its North American and African cousins, its existence suggests that the supposed extinction of the Diplodocidae around the end of the Jurassic or beginning of the Cretaceous period didn't occur globally, but that the clade survived in South America at least during part of the Early Cretaceous.
Dating from the Cretaceous period, the seven eggs are somewhere between 65 and 145 million years old and were discovered in the Gobi desert in China.
Australornis appeared to be most similar to two species described from the late Cretaceous period (around 70 million years ago) of the Antarctic Peninsula and highlighted the links between Antarctica and New Zealand in the late Cretaceous and early Paleocene periods.
Segnosaurus was a meat-eating dinosaur that roamed earth during the late Cretaceous period and can be seen at Gemcraft all week.
ISLAMABAD -- A doctoral student, and member of Scientific Board of Geology Department, Razi University of Kermanshah, has discovered a fossil belonging to Cretaceous period in 73 million years ago.
Both species, herbivores that lived during the Late Cretaceous period, 75 to 83 million years ago, are described in research published in the June 2012 issue of the journal Cretaceous Research.