Hi there,

Some of the best colleges in DU offer BSc in geology such as:

Hans Raj College

Karori mal college 

Hansraj college

Hindu college

 Venkateswara college

 I.p college

 Maitri college

 College of science

 Bhaskar Acharya college

other than that you can opt for PU (Punjab University), CUK(Central University of Karnataka), Pondicherry University, IIT Kharagpur, Indian Institute of ecology and environment.

Hope this helps. Best of luck :)