Isograd meaning

īsə-grăd
A line on a map connecting points on the Earth where metamorphism of rocks occurred under the same pressure and temperature conditions. These lines are established on the basis of the distribution of index minerals and are useful in reconstructing the tectonic history of a given region.
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(geology) A line, either on a map or the surface of the Earth, joining points at which metamorphism reached similar pressures and temperatures; actually the intersection of a surface and that of the Earth.
noun
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