Referenced In

"It rises in the Black mountains, and passes through a hilly country, with a poor soil."

"‘...a Canadian Frenchmen, who had been with the Chayenne Indians on the Black mountains, and last summer descended thence by the Little Missouri.’ The phrase ‘on the Black mountains’ is taken here as a reference to that geographic feature."

"It rises to the west of the Black mountains, across the northern extremity of which it finds a narrow rapid passage along high perpendicular banks…"