A portal into underwater, prehistoric Wisconsin found in the heart of Waukesha County

science • 10/13/2025

In 1984, paleontologists found and saved a portal to prehistoric Wisconsin right in Waukesha County. Scientists are still discovering new fossils from it — most recently a leech that has pushed back the origins of the species by millions of years.

In 1984, paleontologists found and saved a portal to prehistoric Wisconsin right in Waukesha County. Scientists are still discovering new fossils from it — most recently a leech that has pushed back the origins of the species by millions of years. It... [2466 chars]