It is improbable that the Mimas–Tethys resonance was formed by a process analogous to Goldreich's process for e -type resonance Random forces, therefore, probably had a part in the formation. If tidal forces have acted to reduce the amplitude of libration then the tidal dissipation function, Q–1 , is probably independent of amplitude and frequency. Boundary layer turbulence at the base of the planetary atmosphere, therefore, is not at present a substantial source of energy dissipation.