People often confuse directions in this range by thinking that the U notch couloir faces east, but it actually faces north. This means that the ridge is actually running from east to west. As mentioned above, the Palisade Glacier (as seen to the right) is the largest glacier in the Sierra Nevada Mountains. But even this being so, it presents very little difficulty to the mountaineer.
Having crossed this glacier many times, about the most troublesome feature (during some years) has been deep sun cups. That's about it. Other than that, the glacier had no crevices of any magnitude to speak of, and even the bergschrund can usually be passed without too much difficulty in early season. But nevertheless, care should always be taken. On our last trip up Polemonium, my climbing partner Mike told me that he felt the snow bridge, (that we made use of the gain access to the U Notch couloir), vibrate when my son Sean kicked a step into the hard packed snow. If the bridge would have collapsed, we would have most likely found ourselves jammed in the crevice of the bergschrund below. Not a happy thought.
There are several less noteworthy glaciers in the area, the most notable being pocket glacier below the northeast face of Mt Agassiz. Others discount this, and consider it to be just part of a lobe of the main Palisade Glacier. Still others have renamed it Thunderbolt Glacier. So as you can see, there is still some controversy as to the naming of some of the permanent areas of ice and snow in the area.