Lipid bilayers exhibit Structural diversity that contributes to the complex properties of the cell membrane. We use interfacial force microscopy to correlate mechanical properties with the two-dimensional phase behavior of supported lipid bilayers (SLBs). Upon indentation by a 500 lint tungsten tip, a contrast ill the mechanical response is observed for gel vs fluid phase SLBs. We Measure the yield force and time scale for recovery for these films. Consistent with a gel phase, it DSPC SLB has a relatively high yield force and slow recovery. In the higher mobility fluid phase, a DLPC SLB has it lower yield force and completely recovers within the experimental time scale. Friction measurements offer further contrast between the two SLBs.