North America, Mid Cretaceous period

North America, Mid Cretaceous period

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This image is part of the sequence Environment: Artwork of the formation of the North American continent from Cambrian to Tertiary periods

Credit: GARY HINCKS/SCIENCE PHOTO LIBRARY

Caption: 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. The present day position of the United States of America (USA) is shown outlined in white. For North America at different points throughout prehistory, see images E402/163 to E402/171.

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Keywords: america, ancient, artwork, continent, continental, continental drift, continents, cretaceous, dinosaurs, dynamic, dynamics, earth observation, earth science, geographical, geography, geological, geology, geomorphology, historical, history, illustration, land, lithosphere, mesozoic era, mid cretaceous, morphology, north america, north american, ocean, palaeogeographic, palaeogeology, paleogeographic, paleogeology, past, plate tectonic theory, plate tectonics, prehistoric, prehistory, sea, sequence, series, theory, timeline, timescale, united states, united states of america, usa, water

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