About Geological Rock Garden
The Geological Rock Garden in Tirumala is a notified National Geo-Heritage Monument located on the Tirumala Hills in Tirupati district, Andhra Pradesh. It showcases the Eparchaean Unconformity, a major geological discontinuity between 1600-million-year-old Cuddapah quartzites and 2100-million-year-old Archaean granite. Situated near the Silathoranam Natural Arch, it is maintained for visitor education on the region's ancient rock formations.
Visitors guide
Visitors can expect an open-air display of ancient rock formations, boulders and quartzite outcrops set within the forested Tirumala Hills. The site features informative signage explaining the Eparchaean Unconformity, fenced viewpoints, paved pathways and landscaped garden areas. The terrain is rocky and undulating with views of the surrounding Eastern Ghats. It is located close to the Silathoranam Natural Arch and is visited as a short stop en route to Tirumala Temple.
Key highlights
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Eparchaean Unconformity - geological boundary between Archaean granite and Proterozoic quartzite
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Rocks dated to approximately 1600 million years old, declared a National Geo-Heritage Monument by Geological Survey of India
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Located adjacent to Silathoranam, a natural quartzite arch
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Well-preserved quartzite and granite formations of the Cuddapah Supergroup
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Scenic setting within Tirumala Hills of the Eastern Ghats
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Interpretation boards explaining geological history for visitors
History of Geological Rock Garden
The site exhibits the Eparchaean Unconformity, representing a time gap of about 500 million years between the formation of Archaean granite (around 2100 million years) and overlying Nagari Quartzite of the Cuddapah Supergroup (around 1600 million years). It was declared a National Geological Monument by the Geological Survey of India to preserve and showcase this significant stratigraphic boundary.
Culture & Context
Located in the sacred Tirumala Hills, a major pilgrimage centre for the Tirumala Venkateswara Temple, the Rock Garden adds educational and natural heritage value to the pilgrimage route. The nearby Silathoranam arch is traditionally associated with local beliefs and is a point of interest for pilgrims and visitors.