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Cretaceous Research was created in 1980.
Cretaceous.
Cretaceous chalk is a pure, oft, well-jointed limestone.
jurassic
The Triassic was the earliest period of the Mesozoic, followed by the Jurassic then the Cretaceous. The Cretaceous was of the greatest duration.
The period after the Cretaceous is the Paleogene period, which is part of the Cenozoic era. It includes the Paleocene, Eocene, and Oligocene epochs.