Cratons are characterized by Archean crust in surface observations of basement rocks and a thick mantle keel based on xenoliths and geophysical observations.  To preserve this keel, its mantle must be chemically depleted for buoyancy to counteract thermal densification. However, this is often not observed, as shown by metasomatized xenoliths and seismic observations that are at odds with simple mantle structure, suggesting cratons do not always maintain their longevity. We invite contributions from geophysics, geology, geodynamics, and geochemistry addressing formation, tectonic processes and interactions, and destruction of cratons. Part of this interdisciplinary session will focus on the Wyoming province, a former craton that has since been subjected to Phanerozoic continental collision, subduction processes, a possible loss of the mantle keel or other buoyancy changes in the crust and/or mantle, and interaction with a possible hotspot in Yellowstone. We welcome field, laboratory, and numerical studies, particularly those of cross-disciplinary interest.