I guess this is what I am confused about where the bunker ends and through the green begins. The sod/grass above the bunker has it's dirt/roots exposed above where the sand ends. So if I am standing in the bunker I can see the grass/rough on top, then about an inch or two of dirt/roots, then the sand directly below it. My ball drove directly into the roots/dirt which was not touching the sand but it looks like from the definition this would be considered "lip of bunker not covered with grass"? Correct? Now to put a twist on it, had the grass been neatly folded down to the lip of the bunker such that the dirt/roots were not exposed and there was a definite sand/grass border then if the ball had embedded in the grass I could have got relief from embedded ball. Appreciate the discusstion guys. Was playing by myself and was perplexed about what to do. I dropped in the bunker with penalty stroke and played on which looks like it was correct thing to do.