The several segmented structures in this Jerusalem stone pavement are fossils of marine crustaceans, related to crabs and lobsters. The black shadow is from the hands and camera of the professor who took this picture.The pavement is Jerusalem stone, about one million years old. These sea fossils indicate that what is now Jerusalem (along with most of Israel) was under the sea at that time. These, among the most abundant and clear fossils on this campus, are located in the row of pavement stones extending from the entrance to Canada Building to the outside staircase. Can you find the particular stone pictured here? The professor, not yet fossilized, is no longer there.