These laminations are an area of weakness and therefore, prone to increased weathering from wind and water. In fact, looking at the map view of the sandstone we see that the top-most lamination of the arkose sandstone is peeling away similar to how an onion peels into layers. Also present is a joint dissecting the rock perpendicular to the map view. The joint will widen over a period of time because of water and wind agents creating increased weathering. The rock located in these beds is fossiliferous limestone.
Different fossils are present such as coral, brachiopods, crinoids, and horned coral.
When these animals were alive they primarily were composed of a silica skeleton. The silica based fossils are slightly raised above the surface of the limestone because they are more resistant to weathering agents such as acid rain. This weathering agent creates small cavities in the limestone as well as giving the rock a rough texture. These rocks and their fossils provide evidence that a tropical marine sea once existed over most of Indiana and the rest of the mid-west region. The rocks also suggest a modern environment of active weathering from acid rain.