North Dakota
North Dakota’s stone story is shaped by glacial deposits, broad river systems, and sedimentary bedrock of the northern Great Plains. This page highlights common rock types and what they tell us about past environments.
What to look for
- Glacial erratics: transported granites and metamorphic rocks left behind by ice sheets.
- Sedimentary rocks: sandstones, shales, and lignite-bearing layers in parts of the state.
- River gravels: mixed cobbles and pebbles that are great for beginner identification practice.