How can we relate to the deposition of the Florissant Formation? Objective Students will learn about the specific layers of the Florissant Formation in which fossils have been found. By using food items to represent specific layers of the Florissant Formation, they will recreate the formation. Lastly, they will use 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 must be older than th Duration: 30 Minutes.