The red Spearfish Sandstone formed the rim of the sinkhole, so this image shows one edge of the sinkhole.
Out tour guide mentioned that the grinding surface of mammoth molars looked like the bottoms of sneakers. Since we heard that, now when we see mammoth teeth, we always imagine some poor kid buried face down in the rocks!
Another of the animals found was the extinct Short-faced Bear. This is a cast replica in their exhibit hall.