Discussion
The age of Takche Formation, Spiti Valley, Himachal is :
Answer: A
The key gives Ordovician.
The Takche Formation of the Spiti Valley overlies the Thango Formation in the Sanugba Group of the Tethyan Himalaya. Its fossils, conodonts and chitinozoans, date it to the Late Ordovician and early Silurian, so it is commonly described as an Ordovician (to Silurian) carbonate unit.
The Cambrian is represented lower in the Spiti sequence by the Kunzam La Formation, and Jurassic and Palaeocene rocks lie far higher in the succession, so the only option matching the Takche's age is the Ordovician.
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