Arunachala Shiva Thiruvannamalai Three Billion Years Old, GSI
Geological experiments in and around Tiuvannamalai have revealed that the rock (charnokite) which makes up Arunachala covering is older than 3.5 billion years old ( Geological Survey of India) and
Banded Iron formations around Tiruvannamalai area are thought to be about 3 billion years old.
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