A Mexican sheep-herder had collected some of these petrified bones for the foundations of his cabin, the first ever built of such strange materials.

The excavation of a promising outcrop was almost immediately rewarded by finding a thigh-bone nearly six feet in length which sloped downward into the earth, running into the lower leg and finally into the foot, with all the respective parts lying in the natural position as in life.

This proved to be the previously unknown hind limb of the great dinosaur _Diplodocus_.
In this manner the "Bone-Cabin Quarry" was discovered and christened.
The total contents of the quarry are represented in the diagram (not reprinted.) It has given us, by dint of six successive years of hard work, the materials for an almost complete revival of the life of the Laramie region as it was in the days of the dinosaurs.

By the aid of workmen of every degree of skill, by grace of the accumulated wisdom of the nineteenth century, by the constructive imagination, by the aid of the sculptor and the artist, we can summon these living forms and the living environment from the vasty deep of the past.
_The Famous Como Bluffs._ The circumstances leading up to our discovery serve to introduce the story.

From 1890 to 1897 we had been steadily delving into the history of the Age of Mammals, in deposits dating from two hundred thousand to three million years back, as we rudely estimate geological time.