Sibley Regional Volcanic Preserve has some spectacular places like this spot at the north end of the park, where you can visualize when this was a working volcano. Click the view below for a bigger version.
This set of rock layers was laid down flat, but since then it has been tilted counterclockwise to nearly vertical. The red zone appears to be the baked top of a sediment bed that was buried in lava. The sediments were themselves deposited on an earlier lava flow, at right. I didn’t inspect this close up, though, for a couple of reasons. One, I was out for a walk and didn’t have my boots on. For another, this is easy to look at but extremely steep and hard to get close to. Finally, it’s hazardous, being prone to rockfalls: