Science of Geology

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1669

Nicolas Steno

1669 - 1670

Danish geologist who was the first person to give a historical reconstruction of the formation of the geological layers of an area on earth, Tuscany, Italy

John Michell

1760

suggests that earthquakes are caused by one layer of rock rubbing against another

James D. Dana

1880 - 1881

The first geological study of the volcanoes of the Hawaiian Islands

John Milne

1880

invention of the horizontal pendulum seismograph

Marcel Bertrand

1884

proposed the theory that some mountains, Alps, were formed by folding and over thrusting of the earth's crust

Birth of Charles Richter

1900

John Joly

1903

radium used to date the earth and formulation of the theory of thermal cycles

Arthur Holmes

1911

radioactivity used to date rocks

Alfred Wegner

1912

proposal that all continents were one land mass, Pangaea, that broke apart - plate tectonics

Charles Richter

1935

invention of a logarithmic scale used to measure earthquakes - still used today, Richter Scale