It runs from the water gap formed with Bald Eagle Mountain by the Little Juniata River at Tyrone, south to the Sinking Valley anticline fold near Altoona then turns northeast to the Canoe Valley syncline fold, where the ridge becomes Canoe Mountain.

[1] Shortly after 11:00 a.m. EST on July 19, 1996, an F1 tornado touched down northeast of Altoona approximately 1 mile northwest of Sickles Corner on Brush Mountain.

This storm was the fourth in the family of tornadoes that had crossed Clarion, Jefferson, Indiana, Clearfield and Cambria counties.

This leaves the Tuscarora formation more parallel to the steeper western slope, with the crest marking the dividing line between the layers.

The tilted aspect of the rock layers leaves the Juniata formation more perpendicular to the upper portion of the shallower opposite slope, below the steep crest.

The Bald Eagle formation below holds back the eroding rock, creating a shelf above a steeper lower slope running down to Sinking Valley.