Under the dates assigned by [[uniformitarian]] geologists, it represents approximately the period of Earth's history from 145 million years ago to 65 million years ago.<ref>Gradstein, F.M., and Ogg, J.G.,[http://www.stratigraphy.org/scale04.pdf Geologic Time Scale 2004 – Why, How, and Where Next!]</ref> | Under the dates assigned by [[uniformitarian]] geologists, it represents approximately the period of Earth's history from 145 million years ago to 65 million years ago.<ref>Gradstein, F.M., and Ogg, J.G.,[http://www.stratigraphy.org/scale04.pdf Geologic Time Scale 2004 – Why, How, and Where Next!]</ref> |