Hi r/EarthScience, I'm a solo developer who got obsessed with how much you can tell about a place from its rocks alone, and ended up building a small browser puzzle around the idea. Each day it picks one location in the US or Canada and shows you the stratigraphic column for that point plus a unlabeled geologic map. You drop a pin on a regular map where you think it is. Closer = higher score. Practice mode replays past days. All geological data, units, ages, lithologies, formation names, comes from Macrostrat (https://macrostrat.org/). Geologic-map snippets are generated from Macrostrat's tile API. It's free, no signup. Built as a hobby project. Open to feedback, especially from anyone who teaches intro earth science. I'd love to know whether this works as a classroom warm-up. submitted by /u/edwinorange [link] [comments]