| Prehistoric Scratchpad|
The Interstate Park was covered with the basalt that was formed from the volcanic eruptions from the Midcontinental Rift System, which had closed up.
The Midcontinental Rift System caused volcanic eruptions that sent magma through this area 1.1 Billion Years Ago. This rift failed to split open the continent and closed up after 15-22 million years later.
During the Furongian epoch of the Cambrian period, this site was covered by a shallow sea, which deposited sandstone and siltstone atop the basalt (epoch originally called the Croixian in North America).
The St. Croix River Valley was being formed by torrents of water flowing south from the melting glaciers. Glacial potholes formed as the whirlpools in the Glacial St. Croix River dug into the ground The Glacial Gardens contains the greatest concentration of Glacial potholes in the world, and includes the Bottemless Pit, the deepest explored one in the world.
Interstate Park Web PagesEdit
Interstate Park In the NewsEdit
- https://www.youtube.com/watch?v=w4kkKx-Wcoo - Lake Superior and the Midcontinent Rift: the billion year story
- https://www.youtube.com/watch?v=AXEPUgNTmmA - Mid Continent Rift MN and WI