The wall-like, canyon formations were charted by Lewis and Clark as “The Stone Walls.”  Their fantastic outlines have been admired and described by modern tourists, and some of them have been named “Cathedral Rocks,” “Citadel Rock,” “Hole in the Wall,” and so on.

Passing out of this wonderful region, the expedition entered upon a more level country, here and there broken by bluffy formations which extended along the river, occasionally interspersed with low hills.  Their journal says: 

“In the plains near the river are the choke-cherry, yellow and red currant bushes, as well as the wild rose and prickly pear, both of which are now in bloom.  From the tops of the river-hills, which are lower than usual, we enjoyed a delightful view of the rich, fertile plains on both sides, in many places extending from the river-cliffs to a great distance back.  In these plains we meet, occasionally, large banks of pure sand, which were driven apparently by the southwest winds and there deposited.  The plains are more fertile some distance from the river than near its banks, where the surface of the earth is very generally strewed with small pebbles, which appear to be smoothed and worn by the agitation of the waters with which they were, no doubt, once covered.”

Under date of June 2d, the journal says:—­

“The current of the river is strong but regular, the timber increases in quantity, the low grounds become more level and extensive, and the bluffs are lower than before.  As the game is very abundant, we think it necessary to begin a collection of hides for the purpose of making a leathern boat, which we intend constructing shortly.  The hunters, who were out the greater part of the day, brought in six elk, two buffalo, two mule-deer, and a bear.  This last animal had nearly cost us the lives of two of our hunters, who were together when he attacked them.  One of them narrowly escaped being caught, and the other, after running a considerable distance, concealed himself in some thick bushes, and, while the bear was in quick pursuit of his hiding-place, his companion came up, and fortunately shot the animal through the head.”

Here the party came to the mouth of a large river which entered the Missouri from the northwest, at the site of the latter-day town of Ophir, Montana.  This stream they named Maria’s River, in honor of another Virginia damsel.  So large and important in appearance was Maria’s River that the explorers were not certain which was the main stream, that which came in from the north, or that which, flowing here in a general course from southwest to northeast, was really the true Missouri.  The journal says: