GGT was conceived by the Inter-Union Commission on the Lithosphere (ICL), a 'child' of the International Union of Geological Sciences and the International Union of Geodesy and Geophysics (IUGG), at the IASPEI conference in Tokyo in August 1985.

Transects are drawn to common scales and formats so that the Earth's crust in different parts of the world can be directly compared. Since its inception in 1985, GGT has encouraged geoscientists in all countries of the world to compile cross sections of the Earth up to a few thousands of kilometers in length and drawn to the base of the crust using all available geological, geophysical, and geochemical information. The Global Geoscience Transects Project (GGT) is an ambitious international effort that draws together geoscientists in a variety of disciplines to produce the best possible portrayal of the composition and structure of the Earth's crust. Published by the American Geophysical Union as part of the Global Geoscience Transects Series, Volume 1.

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