1590 BCE
Earliest Maps Show Similar Coastlines
Ancient cartographers note the jigsaw fit of South America and Africa, but no scientific explanation is proposed. #geography #history
Chronological Storyline (46 Milestones)
1596 CE
Abraham Ortelius Suggests Continental Drift
Flemish cartographer Abraham Ortelius proposes that the Americas were 'torn away' from Europe and Africa by earthquakes and floods. #geography #history
By Peter Paul Rubens / After Adriaen Thomasz. Key - https://dams.antwerpen.be/asset/B2WNlLjMsJMcW7ZZVQnkrM6W, Public domain, https://commons.wikimedia.org/w/index.php?curid=12621085
1620 CE
Francis Bacon Notes Atlantic Fit
English philosopher Francis Bacon observes the complementary coastlines of Africa and South America in his work 'Novum Organum'. #philosophy #geography
By Paul van Somer I / Formerly attributed to Frans Pourbus the Younger - pl.pinterest.com, Public domain, https://commons.wikimedia.org/w/index.php?curid=19958108
1801 CE
Alexander von Humboldt Describes Continental Fit
German naturalist Alexander von Humboldt describes the geological similarities between Africa and South America, hinting at past connections. #geology #exploration
By Joseph Karl Stieler - [1], Public domain, https://commons.wikimedia.org/w/index.php?curid=10393110
1858 CE
Antonio Snider-Pellegrini Proposes Drift
French geographer Antonio Snider-Pellegrini publishes a map showing the Americas joined to Europe and Africa, suggesting a biblical flood caused separation. #geology #history
By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=400158
1885 CE
Eduard Suess Proposes Gondwana
Austrian geologist Eduard Suess hypothesizes a supercontinent 'Gondwana' linking southern landmasses based on fossil and rock similarities. #geology #paleontology
By Josef Kriehuber - File:Eduard Sueß.jpg (cropped), Public domain, https://commons.wikimedia.org/w/index.php?curid=31526345
1908 CE
Frank Bursley Taylor Proposes Continental Drift
American geologist Frank Bursley Taylor suggests that continents move due to tidal forces, but his idea lacks evidence. #geology #science
By Unknown author - Twenty-Fifth Anniversary Report (Report VII) of the Secretary of the Class of 1886 of Harvard College, 1911, pages 304–305, Public domain, https://commons.wikimedia.org/w/index.php?curid=130926971
Jan 6, 1912 CE
Alfred Wegener Presents Continental Drift
German meteorologist Alfred Wegener presents his theory of continental drift at a meeting of the Geological Association in Frankfurt, citing fossil, geological, and glacial evidence. #geology #science
By Unknown author - Bildindex der Kunst und Architektur: object 20550837 – image file fm426294a.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=18166661
1915 CE
Wegener Publishes 'The Origin of Continents and Oceans'
Alfred Wegener publishes his seminal book detailing the continental drift hypothesis, proposing a supercontinent Pangaea that broke apart. #geology #science
1924 CE
Arthur Holmes Proposes Mantle Convection
British geologist Arthur Holmes suggests that thermal convection in the Earth's mantle could drive continental drift, providing a mechanism. #geology #geophysics
By Unknown author - http://gsahist.org/gsat/gt02mar17_18.htm, Public domain, https://commons.wikimedia.org/w/index.php?curid=16620697
1926 CE
AAPG Symposium Rejects Continental Drift
A symposium of the American Association of Petroleum Geologists largely rejects Wegener's theory, citing lack of a driving mechanism. #geology #history
1929 CE
Arthur Holmes Publishes 'Radioactivity and Earth Movements'
Holmes elaborates on mantle convection as a driver for continental drift, linking radioactivity to internal heat. #geology #geophysics
1937 CE
Alexander Du Toit Publishes 'Our Wandering Continents'
South African geologist Alexander Du Toit provides strong evidence for continental drift from Gondwana sequences, supporting Wegener. #geology #science
1944 CE
Reginald Aldworth Daly Proposes Sliding Continents
Canadian geologist Reginald Aldworth Daly suggests that continents slide on a weak layer, anticipating asthenosphere. #geology #science
1950 CE
Paleomagnetism Studies Begin
Scientists like Keith Runcorn and Stanley Keith Runcorn study remanent magnetism in rocks, revealing polar wander paths that support continental motion. #geophysics #science
By CharlesC - Own work composite, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5890492
1953 CE
Marie Tharp Maps Mid-Atlantic Ridge
Geologist Marie Tharp and Bruce Heezen discover the rift valley of the Mid-Atlantic Ridge, key evidence for seafloor spreading. #geology #oceanography
By Credit Line: AIP Emilio Segrè Visual Archives, Gift of Bill Woodward, USNS Kane Collection - https://repository.aip.org/islandora/object/nbla%3A300331, CC0, https://commons.wikimedia.org/w/index.php?curid=125759265
1956 CE
Seafloor Spreading Hypothesis Proposed
Harry Hess and Robert Dietz independently propose seafloor spreading, where new oceanic crust forms at mid-ocean ridges. #geology #science
By FCrameri - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=141068006
1960 CE
Harry Hess Publishes 'History of Ocean Basins'
Harry Hess publishes a paper outlining seafloor spreading, using bathymetric and magnetic data to explain continental drift. #geology #science
By Unknown author - http://pubs.usgs.gov/gip/dynamic/HHH.html, Public domain, https://commons.wikimedia.org/w/index.php?curid=1261842
1961 CE
Robert Dietz Coins 'Seafloor Spreading'
American geologist Robert Dietz publishes a paper coining the term 'seafloor spreading' and linking it to mantle convection. #geology #science
By Unknown author - University of California, San Diego. Digital Collections. Collection: Scripps Institution of Oceanography Photographs, Public domain, https://commons.wikimedia.org/w/index.php?curid=51678467
1962 CE
Magnetic Stripes Discovered on Ocean Floor
Vine and Matthews show symmetrical magnetic stripes on either side of mid-ocean ridges, confirming seafloor spreading. #geophysics #science
By W. Jacquelyne Kious and Robert I. Tilling - Web page, image. From This Dynamic Earth: The Story of Plate Tectonics (online edition), by W. Jacquelyne Kious and Robert I. Tilling., Public domain, https://commons.wikimedia.org/w/index.php?curid=37706730
1963 CE
Vine and Matthews Publish Magnetic Anomaly Paper
Fred Vine and Drummond Matthews publish their hypothesis that magnetic stripes on the ocean floor record reversals of Earth's magnetic field, providing strong evidence for seafloor spreading. #geophysics #science
1965 CE
Tuzo Wilson Proposes Transform Faults
Canadian geophysicist J. Tuzo Wilson introduces the concept of transform faults, linking seafloor spreading and plate boundaries. #geology #science
By Stephen Morris - Graphics Shop, Department of Physics, University of Toronto, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=43819116
1965 CE
Wilson Proposes Hotspots and Mantle Plumes
Tuzo Wilson suggests that volcanic island chains like Hawaii form as plates move over stationary mantle plumes. #geology #volcanology )
By Joel E. Robinson, USGS. - Cropped from the 108 MB PDF file available here and described here., Public domain, https://commons.wikimedia.org/w/index.php?curid=18129204
1967 CE
Dan McKenzie and Robert Parker Publish Plate Tectonics Paper
British geophysicists Dan McKenzie and Robert Parker independently develop the theory of plate tectonics using spherical geometry. #geophysics #science )
1967 CE
Jason Morgan Quantifies Plate Motions
American geophysicist Jason Morgan publishes a paper showing that Earth's surface is divided into rigid plates moving relative to each other. #geophysics #science
By National Science Foundation - [1]. Transferred from en.wikipedia to Commons by Ephraim33 using CommonsHelper., Public domain, https://commons.wikimedia.org/w/index.php?curid=7901252
1968 CE
Xavier Le Pichon Synthesizes Plate Tectonics
French geophysicist Xavier Le Pichon publishes a comprehensive model of six major plates and their motions. #geology #science
1968 CE
Deep Sea Drilling Project Confirms Seafloor Spreading
The Deep Sea Drilling Project (DSDP) on the Glomar Challenger retrieves sediment cores that confirm seafloor spreading and plate tectonics. #oceanography #science
By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=736329
1969 CE
Subduction Zones Explained
Seismic studies reveal that deep earthquakes occur along Wadati-Benioff zones, confirming subduction of oceanic plates. #geophysics #science
By USGS - https://earthquake.usgs.gov/learn/glossary/?term=Benioff%20zone, Public domain, https://commons.wikimedia.org/w/index.php?curid=25999379
1970 CE
Plate Tectonics Accepted by Scientific Community
By the early 1970s, plate tectonics becomes the unifying theory of geology, replacing geosyncline theory. #geology #science
By M.Bitton - Own work based on: Hasterok, Derrick (8 June 2022). New maps of global geological provinces and tectonic plates. American Institute of Physics - Phys.org. Retrieved on 27 March 2023., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=130076176
1971 CE
Global Plate Boundary Map Published
The first global map of plate boundaries is produced, showing divergent, convergent, and transform boundaries. #geology #science
1972 CE
Lunar Samples Reveal No Plate Tectonics on Moon
Apollo missions return lunar rocks showing that the Moon lacks plate tectonics, highlighting Earth's uniqueness. #space #geology
By Gregory H. Revera - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=11901243
1975 CE
Seismic Tomography Images Mantle Plumes
Advances in seismic tomography allow imaging of mantle plumes, supporting the hotspot theory. #geophysics #science
By Sanne.cottaar - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=64665106
1977 CE
Hydrothermal Vents Discovered at Mid-Ocean Ridges
Scientists discover hydrothermal vent ecosystems on the Galápagos Rift, showing unique life forms supported by geothermal energy. #oceanography #biology
By P. Rona / OAR/National Undersea Research Program (NURP); NOAA - NOAA Photo Library. Memento (WayBack Machine archive.org), Public domain, https://commons.wikimedia.org/w/index.php?curid=262511
1980 CE
Mount St. Helens Eruption Linked to Subduction
The 1980 eruption of Mount St. Helens is understood as a result of the Juan de Fuca Plate subducting under North America. #volcanology #geology
By Austin Post - Huge tif converted to jpeg and caption from USGS Mount St. Helens, Washington May 18, 1980 Eruption Images, Public domain, https://commons.wikimedia.org/w/index.php?curid=3157557
1982 CE
Global Positioning System (GPS) Used to Measure Plate Motion
GPS technology begins to directly measure plate movements, confirming rates of a few centimeters per year. #geodesy #science
By U.S. Air Force - Original source: http://www.losangeles.af.mil/shared/media/ggallery/hires/AFG-100825-006.jpg See also: https://www.af.mil/News/Photos.aspx?igphoto=2001638810 Full resolution: https://www.gps.gov/multimedia/images/GPS-III-A.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=20220437
1985 CE
Very Long Baseline Interferometry (VLBI) Measures Plate Motion
VLBI provides precise measurements of plate motions, corroborating GPS data. #astronomy #geophysics
By ESO/B. Tafreshi/TWAN (twanight.org) - http://www.eso.org/public/images/potw1222a/, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=19646814
1990 CE
Pangaea Reconstruction Refined
Paleomagnetic and geological data refine the reconstruction of Pangaea, showing its assembly and breakup. #geology #paleontology
By Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; Kocsis, Ádám T. - "Phanerozoic-scope supplementary material to "The Cretaceous World: Plate Tectonics, Paleogeography, and Paleoclimate (doi:10.1144/sp544-2024-28)" from the PALEOMAP project". doi:10.5281/zenodo.10659112 https://zenodo.org/records/10659112, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=155112439
1991 CE
Discovery of Slab Windows
Geologists identify slab windows where subducting plates tear, allowing upwelling of asthenosphere and unique volcanism. #geology #science
By Candyyeung168 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=110752762
1995 CE
Seismic Evidence for Inner Core Rotation
Studies suggest Earth's inner core rotates faster than the mantle, influencing geodynamics. #geophysics #science
By IsadoraofIbiza - File:Earth poster.svg, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=146405186
2000 CE
Plate Tectonics on Other Planets?
Evidence suggests that Venus and Mars may have had plate tectonics in the past, expanding comparative planetology. #planetaryscience #geology
2003 CE
EarthScope Project Launched
The US EarthScope project deploys thousands of seismic, GPS, and strain instruments to study North American plate dynamics. #geophysics #science
2005 CE
Sumatra Earthquake and Tsunami Highlight Subduction
The 2004 Indian Ocean earthquake (M9.1) results from subduction of the Indo-Australian Plate under the Burma Plate, causing devastating tsunami. #geology #disaster
By U.S. Navy photo by Photographer's Mate 2nd Class Philip A. McDaniel - This image was released by the United States Navy with the ID 050102-N-9593M-040 (next). This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. العربية ∙ বাংলা ∙ Bahasa Indonesia ∙ Bahaso Jambi ∙ Deutsch ∙ Deutsch (Sie-Form) ∙ English ∙ español ∙ euskara ∙ فارسی ∙ français ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ Plattdüütsch ∙ Nederlands ∙ polski ∙ پښتو ∙ português ∙ русский ∙ slovenščina ∙ svenska ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−, Public domain, https://commons.wikimedia.org/w/index.php?curid=8241767
2010 CE
Mantle Plume Imaging Improved
High-resolution seismic tomography reveals detailed structure of mantle plumes beneath hotspots like Hawaii and Iceland. #geophysics #science
By Brews ohare - Own work based upon Matyska & Yuen (2007) "Figure 17 in Lower-mantle material properties and convection models of multiscale plumes" in Plates, plumes, and planetary processes, Geological Society of America, p. 159 ISBN: 0813724309., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=9454468
2015 CE
Plate Tectonics Found on Europa?
Images from NASA's Galileo mission suggest plate tectonics may be active on Jupiter's moon Europa, with ice plates moving. #planetaryscience #astronomy )
By NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill - File:Europa - Perijove 45 (53255790801).png, from https://www.flickr.com/photos/kevinmgill/53255790801, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=154053125
2019 CE
New Model of Plate Driving Forces
Researchers propose that slab pull and ridge push are the primary forces driving plate tectonics, with mantle convection playing a supporting role. #geology #science
2022 CE
Ancient Plate Tectonics Evidence in 3.8 Billion-Year-Old Rocks
Geochemical evidence from Greenland suggests plate tectonics may have started as early as 3.8 billion years ago. #geology #precambrian