Sonnie Trotter:

In 1975 three Rockies legends scoured The Bow Valley in search of the next great aid line. At the time, they were preparing themselves for a very early repeat of the Shield on El Capitan in Yosemite, and hoped to find the perfect training ground close to home. The Shield is a thin, technically challenging seam, and the three local boys (found in this photo below), finally discovered what they thought would be the ideal line, a rare and steep splitter finger crack on a blank wall.

Cool story.