- Geology of Interstate Park (PDF) (dnr.state.mn.us)
Interstate State Park, at Taylors Falls, Minnesota, contains some of the most outstanding and unique geological features to be found anywhere in the world. The story of how these features came to be as we see them today is complex but fascinating.
- Late Jurassic (Wikipedia)
The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 161.5 ± 1.0 to 145.0 ± 0.8 million years ago (Ma), which is preserved in Upper Jurassic strata.