The Ross Sea bergs we saw earlier in the trip tended to be flat topped, sharp edged, and unworn. Earlier a crewmember had told me he thought the Amundsen Sea bergs were more interesting than those of the Ross Sea. Stan Jacobs has done some thinking about the difference. He told me that the Ross Sea bergs may be younger because the water is deeper and they don't tend to ground there. Additionally, currents may be stronger in the Ross Sea, moving the bergs offshore to melt before they get old.
Some floes have small snowdrifts, and many have evidence of life.
Seal belly tracks look like the little snail tracks you see in the bottom of tide pools, only much larger. Some floes are covered with these grooves, all tending to converge on one place where the seals gathered. Zipper-like penguin tracks are more common. A zipper with a line down the middle indicates the penguin was sliding along on its belly. If there is no line, then the bird was walking.