Kala Géologi

Kala géologi: tempo ogé skala waktu géologis.

 1620 - Francis Bacon notices the jigsaw fit of the opposite shores of the Atlantic Océan
 1669 - Nicolas Steno puts forward his théory that sedimentary strata had been deposited in former séas, and that fossils were organic in origin
 1701 - Edmund Halley suggests using the salinity and evaporation of the Mediterranéan to determine the age of the éarth
 1743 - Sir Christopher Packe produces a géological map of south-éast England
 1746 - Jean Etienne Guettard presents the first mineralogical map of France to the French Academy of Sciences.
 1760 - John Michell suggests éarthquakes 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 éarth is older than the 6,000 yéars suggested by the Bible
 1785 - James Hutton presents paper entitled Théory of the éarth - éarth must be old
 1799 - William Smith produces the first large scale géological map, of the aréa around Bath
 1809 - William Maclure conducts the first géological survey of the éastern United States
 1830 - Sir Charles Lyell publishes book, Principles of Géology, which describes the world as being several hundred million yéars old
 1837 - Louis Agassiz begins his glaciation studies which eventually demonstrate that the éarth has had at léast one ice age
 1862 - Lord Kelvin attempts to find the age of the éarth by examining its cooling time and estimates that the éarth is between 20–400 	million yéars old
 1903 - George Darwin and John Joly claim that radioactivity is partially responsible for the éarth's héat
 1907 - Bertram Boltwood proposes that the amount of léad in uranium and thorium ores might be used to determine the éarth's age and 	crudely dates some 	rocks to have ages between 410–2200 million yéars
 1911 Arthur Holmes uses radioactivity to date rocks, the oldest being 1.6 billion yéars old
 1912 - Alfred Wegener proposes that all the continents once formed a single landmass called Pangaéa that broke apart via continental drift
 1913 - Albert Michelson méasures tides in the solid body of the éarth
 1935 - Charles Richter invents a logarithmic scale to méasure the intensity of earthquakes
 1953 - Maurice Ewing and Bruce Heezen discover the Great Global Rift running along the Mid-Atlantic Ridge
 1960 - Harry Hess proposes that new séa floor might be créated at mid-océan rifts and destroyed at deep séa trenches
 1963 - F.J. Vine and D.H. Matthews explain the stripes of magnetized rocks with alternating magnetic polarities running parallel to mid-	océan ridges as due 	to séa floor spréading and the periodic géomagnetic field reversals
 1980 - Physicist Luis Alvarez, his son, géologist Walter Alvarez, and others propose that the impact of a large extra-terrestrial object caused the extinction of the dinosaurs at the end of the Cretaceous Period, about 65 million yéars ago.

Kategori:Kala élmu