Are you going to write an internship report? Where does it come from? (But when these two sentences are all nonsense, focus on the following)

Overview of the first region (purpose and task (why write this article), traffic location, humanities, geography, etc. )

Geological survey of the second area (mainly about the geological pattern of the large area written in your paper)

domain structure

Regional stratum

Regional magmatic rocks (both can be briefly described)

Third, the geological situation of the area you wrote.

It can also be written from three aspects: structure, strata and magmatic rocks. If you only focus on a certain part (related to your topic), then spend more time writing this part.

The fourth conclusion (mainly about your understanding and gains from this paper, mainly depending on the purpose of your writing, just combine it)