What period follows the Cretaceous?
Q: What period follows the Cretaceous?
A: The Cainozoic era follows the Cretaceous period.
Q: How long did the Cretaceous period last?
A: The Cretaceous period lasted 80 million years, from 145 to 65 million years ago (mya).
Q: How many epochs are in the Cretaceous period?
A: There are two very long epochs in the Cretaceous period - Upper and Lower.
Q: How long was the Lower Cretaceous epoch?
A: The Lower Cretaceous epoch lasted 45 million years, from 145.5 mya to 100.5 mya.
Q: What is chalk made up of?
A: Chalk is 95% to 99% made up of coccoliths, which are calcium carbonate (CaCO3) plates produced by tiny single-celled algae (coccolithophorids).
Q: What caused an extinction event at the end of the Upper Cretaceoues period?
A: At the end of the Upper Cretaceoues period, a famous meteorite strike combined with volcanic flood basalts spewed out in India caused an extinction event known as K/T extinction event.
