I'm not 100% satisfied with how I've done the finish of the strata that end mid-tier. In the turquoise section, I used a "blunt" finish, slightly curved, which you can see in the left third of the turquoise section above. I've tried something else in the orange-red tier. One finish, about a third of the way in from the left, is slightly "stepped" rather than curved; hard to see in the photo above, a bit more visible below. A second is done with a series of points, readily seen below, towards the right edge of the photo.
I was excited to try these other methods, but, in the end, I think I like the blunt end better.