Timeline of geology
16th and 17th centuries
Portuguese and Spanish explorers systematically measure magnetic declination to estimate the geographical longitude 
- 1701 - Edmund Halley suggests using the salinity and evaporation of the Mediterranean to determine the age of the Earth
- 1743 - Dr Christopher Packe produces a geological map of south-east England
- 1746 - Jean-Étienne Guettard presents the first mineralogical map of France to the French Academy of Sciences.
- 1760 - John Michell suggests earthquakes are caused by one layer of rocks rubbing against another
- 1776 - James Keir suggests that some rocks, such as those at the Giant's Causeway, might have been formed by the crystallisation of molten lava
- 1779 - Comte de Buffon speculates that the Earth is older than the 6,000 years suggested by the Bible
- 1785 - James Hutton presents paper entitled Theory of the Earth - earth must be old
- 1799 - William Smith produces the first large scale geological map, of the area around Bath
- 1903 - George Darwin and John Joly claim that radioactivity is partially responsible for the Earth's heat
- 1907 - Bertram Boltwood proposes that the amount of lead in uranium and thorium ores might be used to determine the Earth's age and crudely dates some rocks to have ages between 410-2200 million years
- 1911 - Arthur Holmes uses radioactivity to date rocks, the oldest being 1.6 billion years old
- 1912 - Alfred Wegener proposes that all the continents once formed a single landmass called Pangaea that broke apart via continental drift
- 1912 - George Barrow maps zones of metamorphism (the Barrovian sequence) in southern Scotland
- 1913 - Albert A. Michelson measures tides in the solid body of the Earth
- 1915 - Pentti Eskola develops the concept of metamorphic facies
- 1928 - N. L. Bowen publishes The Evolution of the Igneous Rocks, revolutionizing experimental igneous petrology
- 1935 - Charles Richter invents a logarithmic scale to measure the magnitude of earthquakes ()
- 1941 - Nickel-Strunz classification, Karl H. Strunz, Mineralogische Tabellen
- 1948-1959 - Felix Andries Vening Meinesz investigations show gravity anomalies, implying that the crust is moving (together with J.H.F. Umbgrove, B.G. Escher and Ph.H. Kuenen)
- 1951 - Alfred Rittmann links subduction, volcanism and the Wadati-Benioff zone
- 1953 - Maurice Ewing and Bruce Heezen discover the Great Global Rift running along the Mid-Atlantic Ridge
- 1960 - Harry Hess proposes that new sea floor might be created at mid-ocean rifts and destroyed at deep sea trenches
- 1963 - Frederick Vine and Drummond Matthews explain the stripes of magnetized rocks with alternating magnetic polarities running parallel to mid-ocean ridges as due to sea floor spreading and the periodic geomagnetic field reversals (Vine-Matthews-Morley hypothesis)
- 1966 - Keiiti Aki discovers the seismic moment ()
- 1979 - Thomas C. Hanks and Hiroo Kanamori, Moment magnitude scale (), it succeeds the Richter magnitude scale
- 1980 - Physicist Luis Alvarez, his son, geologist Walter Alvarez, and others propose that the impact of a large extraterrestrial object caused the extinction of the dinosaurs at the end of the Cretaceous Period, about 66 million years ago.
- ^ A. Salam (1984), "Islam and Science". In C. H. Lai (1987), Ideals and Realities: Selected Essays of Abdus Salam, 2nd ed., World Scientific, Singapore, pp. 179-213.
- ^ Stephen Toulmin and June Goodfield (1965). The Discovery of Time, p. 64. University of Chicago Press, Chicago.
- ^ Toulmin, S. and Goodfield, J. (1965), 'The Ancestry of science: The Discovery of Time', Hutchinson & Co., London, p. 64.
- ^ a b c Geoscience blog
- ^ Alvarez & Leitao, 2010, Geology, 38, 231-234, doi:10.1130/G30602.1
- ^ G. B. Vai et W. Cavazza, ed, Four centuries of the word 'Geology', Ulisse Aldrovandi 1603 in Bologna, Minerva Edizioni, Bologna, 2003