65.5 - 145.5 mya
Cretaceous period is usually known for being the last portion of dinosaurs period. Reptiles were the main species during this time period. The first appearance of flowering plants in this era. Many of the well known dinosaurs were found in this period. Reptiles in this time period were Triceratops, Centrosaurus, and Tyrannosaurus Rex
The Cretaceous climate was humid and snow was thought to have fallen in higher altitudes of the world. Rocks made up nearly 29% of Earth total land masses. Cretaceous rocks are the most studied part of the Phanerozoic rock column. Cretaceous oceans covered 50% of the president day North American continent. 79 million years ago was warm and had high sea level.