Option 1: This statement is incorrect. Natural gas is not found in Dharwar rock formation. Natural gas is typically found in sedimentary rocks, such as shale.

Option 2: This statement is correct. Mica is indeed found in Kodarma, a region in the state of Jharkhand, India. Kodarma is known for its rich deposits of mica, which is a mineral that is widely used in various industries.

Option 3: This statement is incorrect. The Cuddapah series is not famous for diamonds. The Cuddapah series is a geological formation in India that is known for the presence of shale, limestone, and other sedimentary rocks.

Option 4: This statement is incorrect. Petroleum reserves are not found in the Aravali hills. The Aravali hills are a range of mountains in India that are not known for significant oil or gas deposits.

In conclusion, the correct statement is Option 2, which states that mica is found in Kodarma.