GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
North America, Mid Cretaceous period. Image 6 of 9. Computer artwork of the Mid Cretaceous period stage of a sequence showing the formation of the North American continent. The Cretaceous period extended from approximately 145 to 65 million years ago, ending with the extinction of the dinosaurs. The continents are slowly moved over the surface of the Earth by currents in the fluid mantle below the crust. Over millions of years the continents moved into the positions they are in today. For North America at different points throughout prehistory, see images E402/153 to E402/161.
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