Pangea

Pangea
Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; · CC BY 4.0 · source
Name	Pangea
Type	Supercontinent
Period	Late Paleozoic–Early Mesozoic
First formed	~335 Ma
Breakup	~175 Ma
Status	Supercontinent

Pangea was a late Paleozoic to early Mesozoic supercontinent that assembled most of Earth's continental crust into a single landmass. It influenced global plate tectonics, climate change, biogeography, and the distribution of fossil assemblages during the late Carboniferous, Permian, and early Triassic periods. Reconstructions of its configuration integrate data from Alfred Wegener–inspired continental drift hypotheses, modern plate reconstruction methods, and stratigraphic correlations across present-day Africa, Eurasia, North America, South America, India, Antarctica, and Australia.

Etymology

The name derives from Greek elements popularized in 20th-century geological literature by researchers following Alfred Wegener's 1912 proposals and later work at institutions such as the Geological Society of America and the Royal Society. It entered scientific usage alongside terms like Laurasia and Gondwana in syntheses by scholars associated with the British Geological Survey and the United States Geological Survey. Historical debates involving figures at the Smithsonian Institution and correspondence among geologists in the Royal Geographical Society influenced adoption of the term in textbooks and monographs by authors linked to Cambridge University Press and Elsevier.

Formation and configuration

Assembly models invoke collisions among continental blocks driven by plate motions recorded in Pangea reconstructions developed using paleomagnetic data from expeditions associated with Lamont–Doherty Earth Observatory, Scripps Institution of Oceanography, and researchers at ETH Zurich. Convergent margins involving proto-North America (Laurentia), proto-Europe (Baltica), and Siberia interacted with Gondwana fragments including South America, Africa, India, Antarctica, and Australia during mountain-building events such as the Hercynian orogeny and the Alleghanian orogeny. Reconstructions by teams at Princeton University, MIT, Stanford University, University of Cambridge, and University of Oxford show a configuration with a single megacontinent surrounded by the Panthalassa and marginal basins similar to those studied by scholars at the Woods Hole Oceanographic Institution and the National Oceanic and Atmospheric Administration.

Geological evidence

Multiple independent lines of evidence from paleomagnetism studies at Lamont–Doherty Earth Observatory, fossil correlations noted by paleontologists affiliated with the American Museum of Natural History and the Natural History Museum, London, and stratigraphic continuity identified by geologists at the Canadian Geological Survey and the Geological Survey of India support assembly. Shared glacial deposits across present-day Brazil, South Africa, India, and Australia were reported in monographs by researchers at Harvard University and Yale University. Orogenic belts such as the Ural Mountains and the Appalachian Mountains record collisional histories studied by teams at Arizona State University and the University of California, Berkeley. Marine faunal assemblages including brachiopods, trilobites, and ammonoids correlated by specialists at the Smithsonian Institution and the Natural History Museum of Vienna provide biostratigraphic links consistent with contiguous landmasses.

Paleoclimate and paleoecology

Pangea's vast interior produced arid conditions inferred from evaporite sequences examined by researchers at Texas A&M University and coal-bearing strata studied by scientists at the Pennsylvania Geological Survey and University of Glasgow. Climate modelling groups at Met Office and NASA Goddard Institute for Space Studies used general circulation models constrained by paleobotanical data from collections at the Royal Botanic Gardens, Kew and the New York Botanical Garden to simulate strong continental seasonal contrasts and monsoonal patterns that influenced distribution of taxa such as Glossopteris, Lystrosaurus, Cynognathus, and Mesosaurus, whose fossils were catalogued by curators at the Bolivian Geological Survey and the South African Museum. Mass extinction events at the end of the Permian—studied by teams at University of Tokyo and Max Planck Institute for Chemistry—had profound impacts on terrestrial and marine ecosystems across the supercontinent, as reflected in isotopic anomalies measured at facilities like ORNL and Lamont–Doherty Earth Observatory.

Breakup and rifting

Rifting initiated in the early Jurassic with progressive opening of oceanic gateways including the proto-North Atlantic and the Tethys Sea, processes analyzed in seismic surveys run by the USGS, Bureau of Ocean Energy Management, and academic consortia at Geological Survey of Norway. Mantle plume hypotheses involving anomalies similar to the Central Atlantic Magmatic Province and events recorded at sites investigated by the Istituto Nazionale di Geofisica e Vulcanologia and Geological Survey of Canada explain flood basalts and continental breakup stages. Chronologies refined using radiometric dating at laboratories such as Caltech and ETH Zurich link breakup to plate reorganizations that led to separation of Africa and South America, northward drift of India toward Eurasia, and isolation of Australia and Antarctica.

Tectonic legacy and modern continents

Remnants of collisional sutures and rifted margins persist in orogenic belts like the Himalayas, the European Alpine system, and the Atlas Mountains, researched by groups at Columbia University, ETH Zurich, and CNRS. Continental fragments dispersed by breakup accreted onto the margins of lithospheric plates studied by scientists at Imperial College London and University of California, Los Angeles. Modern paleogeographic frameworks produced by consortia including PALEOMAP Project and researchers at University of Wisconsin–Madison integrate sedimentary basin archives, paleomagnetic poles, and fossil distributions to trace how the supercontinent's fragmentation shaped present-day configurations of Africa, Eurasia, North America, South America, Antarctica, India, and Australia and influenced economic geology in provinces explored by the Energy Information Administration and mining surveys such as the Geological Survey of Brazil.

Category:Supercontinents