In the journal is given a glowing account of the work and an elaborate map of the same.

Modern research, however, has proved that this strange arrangement of walls and parapets is only a series of sand ridges formed by the currents of the river and driftings of sand.

Many of these so-called earthworks are situated on the west bank of the Upper Missouri, in North Dakota and South Dakota.
A few days later, the party saw a species of animal which they described as "goats,"-- very fleet, with short pronged horns inclining backward, and with grayish hair, marked with white on the rump.

This creature, however, was the American antelope, then unknown to science, and first described by Lewis and Clark.

While visiting a strange dome-shaped mountain, "resembling a cupola," and now known as "the Tower," the explorers found the abode of another animal, heretofore unknown to them.
"About four acres of ground," says the journal, "was covered with small holes." The account continues: "These are the residence of a little animal, called by the French petit chien (little dog), which sit erect near the mouth, and make a whistling noise, but, when alarmed, take refuge in their holes.