For anyone interested in Paleontology, there are some interesting fossils in formations along the northeast ridge. The first I noticed were a large quantity of burrows (trace fossils) right after the first scramble. Later on there is a formation with Rugose Corals and Crinoid stems. All the formations intersect the route, so you don't have to leave the ridge to see them.
Also, as tempting as it may be to collect them, please leave them where they are so others can enjoy them (at least the ones on the ridge). They are in a hard limestone and getting them out would be painstaking and likely destroy them anyways. If you really want some, take the effort to go off-route a ways.