Days and weeks he may spend in fruitless search following along the outcrop of the formation, through rugged badlands, along steep canyon walls, around isolated points or buttes, without finding more than a few fragments, but spurred on by vivid interest and the rainbow prospect of some new or rare find.

Finally perhaps, after innumerable disappointments, a trail of fragments leads up to a really promising prospect.

A cautious investigation indicates that an articulated skeleton is buried at this point, and that not too much of it has "gone out" and rolled in weathered fragments down the slope.

For the tedious and delicate process of disinterring the skeleton from the rock he will need to keep ever in mind the form and relations of each bone, the picture of the skeleton as it may have been when buried.

The heavy ledges above are removed with pick and shovel, often with help of dynamite and a team and scraper.