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Fossils at Perambalur
November 3 , 2020
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- More than 25 concretions (ammonium sediments) were found in Kunnam (Perambalur).
- The round-shaped Phosphatic nodules, called Uttatur potatoes, were also available in Kunnam and Karai areas.
- A fossilised tree and ammonite sediments were also found in Aanaivari stream in the area.
- The ammonite (ammonoids) was a large and diverse group of marine species
- It originated around 416 million years ago during the Devonian period.
- Ammonites survived three mass extinctions.
- Out of that, the Permian extinction is the most notable one
- It was a global warming brought on by volcanic activity about 252 million years ago.
- It killed 96 per cent of the planet’s marine species.
- Some years back, the Archaeological evidence suggests that dinosaurs lived in the Ariyalur area of Tamilnadu 6.5 billion years ago.
- But the remains of the eggs are rarely found.
- Earlier Ariyalur and Perambalur were submerged in the sea in present-day Tamil Nadu.
- Fossils in Kunnam might have formed about nine billion years ago when the depth of the sea was about 100 metres in the Turonian-Cenomanian Cretaceous period.
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