"The Cretaceous ( /krɪˈteɪ.ʃəs/, krih-TAY-shəs) is a geological period that lasted from about 145 to 66 million years ago (mya). It is the third and final ...
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period of the Mesozoic Era. The name is derived from the Latin creta. It is usually abbreviated K, for its German translation Kreide.
The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. During this time, new groups of mammals and birds, as well as flowering plants, appeared." - (en.wikipedia.org 28.03.2020)