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The ExpeditionYellowstone Aerials
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Badlands (Wark aerials)

Yellowstone Badlands

Badlands in the vicinity of Terry, Montana
Badlands west of Terry, Montana, looking westward.

ere Larocque had it easy, traveling on the southeast side (the viewer's right) of the Yellowstone. The following summer (July 29, 1806), Clark recorded his impression of the breaks on the northwest side: "The hills are high and ruged Containing Coal in great quantities." That is all he could see of the stream-deposited, coal-bearing, extensively eroded sediments of the Paleocene Epoch (6558 million years ago), in what geologists today call the Tullock member of the Fort Union formation.

Badlands near Terry, Montana
Badlands in the vicinity of Terry, Montana.

Rainsplash, wind, and runoff erosion have carved the soft, pale gray mudstone and somewhat harder ledges of brown sandstone into fantastic layered shapes.

Copies of Jim Wark's aerial photos of the Lewis and Clark Trail
are available direct from AIRPHOTO North America.

Where's Pompy?
More Badlands (Wark aerials)

From Discovering Lewis & Clark ®, http://www.lewis-clark.org © 1998-2014
by The Lewis and Clark Fort Mandan Foundation, Washburn, North Dakota.
Journal excerpts are from The Journals of the Lewis and Clark Expedition, edited by Gary E. Moulton
13 vols. (Lincoln: University of Nebraska Press, 1983-2001)