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Oceanic crust
██ 0-20 Ma
██ 20-65 Ma
██ >65 Ma
Geologic province
██ Shield
██ Platform
██ Orogen
██ Basin
██ Large igneous province
██ Extended crust
These geologic province maps depict only features approximately 150 km across and greater due to the fact that the resolution of the maps should be consistent with the resolution of the seismic refraction data.
Source: http://quake.wr.usgs.gov/research/structure/CrustalStructure/database/type.html ; original upload english wikipedia 22 April 2005 by SEWilco
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