Today you can locate anything on Earth to within a meter very easily, thanks to GPS technology. But old records specify locations using different methods that geologists must be familiar with. One of these is the U.S. Public Land Survey System, which covers most of the country except the original 13 eastern states plus Kentucky, Tennessee, Texas and Hawaii. It can record the location of a feature (property, well, monument or bedrock exposure) very compactly by using simple fractions and a few key geographic points.
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