Unformatted text preview: c (later
called the Mid-Atlantic Ridge) OCE 661 Chronology of recent discoveries in this area
a. 1947: Maurice Ewing determines the existence of a vast
b. 1947: Oceanographers abandon the idea that the
Oceans' floors are flat and produce arguments in favor of
the continental drift hypothesis.
c. 1950's: Prompted by studies of paleomagnetism in the
1940's, geologists and oceanographers begin to accept the
concept of continents moving relative to magnetic poles
and to one another. This change represents the beginning
of sea floor spreading and plate tectonics.
d. 1953 : American geologists Maurice Ewing and Bruce
Heezen discover an underwater canyon , and in 1956 they
propose the existence of the Mid-Oceanic Ridge,
accompanied by a formation of canyons called the Great
Global Rift. The discovery that the rift separates the Earth's
crust into plates contributes to the development of the
theory of plate tectonics.
e. 1960: US Geologist Harry Hess proposes the concept
of sea floor spreading, a key idea in plate tectonics. Hess
suggests that new crust fo...
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- Winter '14
- Plate Tectonics, Atlantic Ocean, Mantle, Alfred Wegener, Richards