Hira, Geology was previously accommodated with Geography, Botany, Zoology, n i guess along with Chemistry n Physics. These all subjects carried the load of 200 marks each. Now, after the regrouping, they are distributed in two different Groups. Geology was the least opted subject previously due to its rough nature, broad syllabus, n especially it requires background because the paper often comes very analytical n you are supposed to reply the examiner in a research paper tone. So, Students (generally) didn't bother that load in Past. Now, things are different. to be very rational i don't see any (Major) Comprenssion in new syllabus following the Capacity of Century, but (Slight) Expansion!
Meanwhile, it is a SAFE Choice along any Math's Optional or Statistics.
Hope this helps..
Jazak-Allah