Visitors to the South Unit may experience up to 30 minute delays and rough road conditions due to road construction along East River Road. Check at South Unit Visitor Center for current road conditions. Updated 07/09/2014 5:16 pm MT
Glaciers / Glacial Features
Although glaciers are not to be found in Theodore Roosevelt National Park, the evidence of their geologically recent presence is throughout the park's landscape. During the Pleistocene Ice Age, tremendous ice sheets advanced from the north, redirecting the course of the Little Missouri River. Its new course caused the Little Missouri to carve more sharply into the soft sedimentary rock in the badlands, creating much of the broken topography found throughout the park.
Direct evidence of the glaciers' recent presence is found in the North Unit. There, at the north rim of the the Little Missouri River Valley, the Pleistocene ice sheets reached the southernmost point of their advance. As the ice sheets stalled there, the conveyor belts of ice continued to transport rock from far away, depositing it at the foot of the glacier. Some of the rocks carried and deposited by the glaciers in this manner are called glacial erratics. These rocks are particularly noticeable because they are made of granite, an igneous rock found nowhere else in Theodore Roosevelt National Park's sedimentary rock layers.
A pullout along the North Unit Scenic Drive highlights the presence of glacial erratics.
Did You Know?
Prairie dogs are often persecuted for their apparent destructiveness to the plants in their towns. Although they do keep the grass's growth to a minimum, the rodent's foraging habits promote the growth of forbs, upon which other grazing animals such as bison, elk, deer, horses, and pronghorns feed. More...