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On this day in Lewis & Clark history...

After waiting for the Missouri River fog to lift near present Nemaha, Nebraska, the Expedition sets out at 7 am. Lewis' chronometer, necessary for calculating accurate longitude, stops running.

From the journals...

July 15th, Sunday

this plain appeared to extend 20 or 30 miles, those Hills have but little timber, and the Plain appears to Continu back of them—

William Clark

"Typical surface of the country underlain by the Ogallala formation of the High Plains of western Kansas, buffalo wallow; shallow circular depression in the level surface, in foreground. Haskell County, Kansas." (U.S. Geological Survey, 1920). Photo has been digitally modified.

Kansas buffalo wallow

Large oval depression in an endless prairie

Photo by an unknown photographer: Plate 2 in U.S. Geological Survey. Folio 212. 1920.