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Abraham ortelius
Thought America, eurasia, and africa were once joined and were separated by floods and earthquakes.
AB -
Period: to
Nicolaus Steno
The Law of Superposition: That newer layers form atop older layers. -
James Hutton
The geoloical forces at work in the present day are the same as those that operated in the past. e used Steno's laws to develope this theory. -
Alfred Wegener
Continental drif theory: Noticed that there were different glacial deposits in South America and Africa. Fossils often indicate a cimate very different from the climate of today. -
Aurthur Holmes
He predicted that convection currents within the Earth's mantle are driven by radioactive heat might furnish the mechanism for the Continental drift theory. -
Harry Hess
Came up with the sea floor spreading theory. Idea that the seafloor itself moves and carries continents with it as it expands from a central point. -
Dan Mckenzie
Theory of plate tectonics-combination of continental drift and sea floor spreading
