Which of the following statements are correct about Rock system in India 1 Most of the coal found in...........

Geography (CDS) World Physical Aspects

Which of the following statements are correct about Rock system in India?

1. Most of the coal found in India is a part of the Carboniferous rocks.

2. Purana Rock System includes the Cuddapah System and the Vindhyan System.

3. Dravidian Rock System are sedimentary rocks, and abundant fossils can be found in them.

Select the correct answer using the code given below:

1 and 2 only

2 and 3 only

1 and 3 only

1, 2 and 3

Archaean Rock System (Pre-Cambrian Rocks): Rocks formed prior to the Cambrian system. They include:
Archaean Gneisses and Schists (4 billion years old)
Oldest rocks (formed in the pre-Cambrian era – about 4 billion years ago).
These rocks were formed due to solidi fi cation of molten magma – the earth’s surface was very hot then.
They are known as the ‘Basement Complex’ (they are the oldest and forms the base for new layers)
They are azoic or unfossiliferous plutonic intrusions (magma solidi fi ed below the surface).
Dharwar System (1 to 4 billion years old)
Formation period ranges from 4 billion years ago to – 1 billion years ago.
They are highly metamorphosed sedimentary rock-system (formed due to the metamorphosis of sediments of Archaean gneisses and schists).
They are the oldest metamorphosed rocks.
They are found in abundance in the Dharwar district of Karnataka.
They are economically the most important rocks because they possess valuable minerals like high-grade iron-ore, manganese, copper, lead, gold, etc.