As you follow this valley back, sharp peaks are on either side and where it gets steeper is actually the face of a rock glacier. Stay to the left and climb up to the ridge to see an awesome unobstructed view of Mount Rumble. From this point, look down over 4,000 feet to the head waters of Peter's Creek, which surround Mt. Rumble, which now towers straight up to over 7,000 feet. Should you continue back on the rock glacier, you will find many sink holes and other unusual land formations and eventually end up at bombardment pass.