Q. Which series of the Dharwar geological system is alternatively referred to as the "Delhi Series"?
Answer: Rialo Series
Notes: The Rialo Series is part of the Dharwar geological system and is also known as the Delhi Series. The Dharwar system is the second oldest Precambrian rock system in India. It was formed approximately 2.6 billion years ago in the regions of Karnataka, Andhra Pradesh, and Tamil Nadu. It was named after the city of Dharwad, where these rocks are most prominently found.

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