Lava Beds Natl Mon Devils Homestead Flow CA (1034)

That's an interesting ridge in the background. I'd be willing to bet that results from faulting along the lines of what slgwv described on those Nevada pictures.

The large lava flow that's essentially at the base of the cliffs confounds things for me somewhat...

I think Clint's correct that the slope up to the bench on the right reflects a fault scarp, such that the capping lava flow is truncated. From the pic, the relation of the foreground flow is unclear. I suspect that it's a considerably younger flow that was erupted after the faulting occurred, or at least after most of it occurred. You could test this by looking at the field relations of that flow against the scarp; does it lap up against it, or is it truncated? This would be an example of using the field relations to establish a relative chronology, a basic technique. (Things overlying other things are younger; a fault cutting units is younger than those units; and so on. As I'd tell classes, it's surprising how powerful such simple observations can be!) You also can often match up outwardly similar flows by comparing the details of their textures, mineralogy, and detailed composition (e.g., trace elements). Not all basalts look exactly alike! ;) So this can determine whether an apparently offset flow is, in fact, the same.