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Archaean basement meets Cuddapah cover across a vast time gap.

On the ghat road up to Tirumala, ancient Archaean basement rock meets the much younger Cuddapah sediments across the Eparchaean Unconformity — a surface that represents hundreds of millions of years of missing time.

Sources

• Geological Survey of India — National Geological Monuments

A short reference note: this summary draws on third-party sources such as the Geological Survey of India and Wikipedia. In time I plan to give every geological feature its own learning-oriented write-up — with custom diagrams, graphs, and study pointers — as I’ve already done for the 11 locations that have an Instagram reel.