The Geography of the Puranas c13.s7.4
The Geography of the Purāṇas c13.s7.4
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c13.s7.4
The great disturbances of the earth's crust that opened the next, the Late Palaeozoic, chapter of the earth's history are known as the Caledonian revolution. The processes repeat themselves and similar revolutions occur in the ages which followed it. The Appalachian or Hercynian revolution took place in about 150,000,000 B.C. while the Alpine-Himalayan revolution occurred in about 40,000,000 B.C.