Concept of Geologic Time

I visited the mid-eastern area of California, where there was a lot of complex, red and orange geologic markers according to the map.

If I were allowed 3 pieces of information or resources to best aid my understanding of the geology, I would request:
1. The history of volcanic activity, because the rocks there are volcanic rocks, meaning there must have been an active volcano there at some point, possibly even still today. This volcanic activity would change the entire make up of the rocks, vegetation, even landscape of the area.
2. The nearby fault lines, because this would determine the likelihood of an earthquake or other disaster in that area. I know that it is fairly common for earthquakes to occur in California. These natural events also alter the landscape to an extreme extent, as an earthquake is literally two plates scraping each other.
3. Lastly, I would request the rock make-up of the area. Is it primarily sedimentary, volcanic, or igneous? How old are the rocks and where did the rock originate? These questions help to build a better understanding of the geologic area and it's history.