If you check the Minimum Eligibility qualification on the official website of IIT JAM then you will find that the qualifications mentioned there doesn't matches for any of the IIT's or participating institutes offering the course of MSc in Geology. So through IIT JAM examination, you aren't eligible for the MSc in Geology course by qualifying the Geology paper.

For more information regarding Minimum Eligibility requirement of IIT JAM,  consider the link below:

https://jam.iitr.ac.in/minimum-educational-qualifications.html

For more information regarding IIT JAM consider the link provided below:

https://university.careers360.com/exams/jam

I hope this helps. Wish you a great eve!