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" ... East Antarctica’s geology, as this map shows, is relatively frigid. This makes sense, because the rock, in this case, is stupendously old. This part of Antarctica is made up of cratons, which are huge masses of continental crust that have remained in a state of stability for billions of years. In fact, in East Antarctica the rocks date back to the Precambrian Eon, a huge expanse of time starting with the birth of Earth 4.6 billion years ago to around 541 million years ago, when complex life first exploded into the fossil record. ... "