Hey, 

B.Sc. Geology hons is a three year undergraduate course for which the fees ranges from INR 5000 - INR 150000. Most of the colleges have eligibility criteria as : the applying candidate shall have atleast obtained 50% in 10+2th from a recognized board 

Best colleges for B.Sc. Hons Geology in India are 

• Hans Raj College, Delhi
• Ashutosh College, Kolkata
• St. Xavier's College, Ranchi
• Maharaja Sayajirao University of Baroda
• Jogmaya Devi College, Kolkata
• Gossner College, Ranchi
• Panjab University, Chandigarh 
• Banaras Hindu University, Varanasi

Hope it helps :)