What is a Stratigraphic Column? What is a Cross Section? How do rock layers relate to a Stratigraphic Column? Objective 1. Students will learn about the specific layers of the Florissant Formation in which fossils have been found 2. Using food to represent each rock layer in a stratigraphic column 3. Using a plastic knife to cut the sandwich in half and show a cross section of their formation Background Stratigraphy is the study of rock beds (layers) and their ages in relation to one another. The law of superposition states that any rock layer underlying another mu st be older than the one abo Duration: 30 Minutes.