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The ExpeditionYellowstone River ReturnCoal in the Bank
1805: Carbonated Wood
Pumies Stone
 

Fort Union Formation



1805: Carbonated Wood
Pumies Stone


 
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)