Tony,
I have both styles. The surface rocks are more of a flat weather worn rocks that would be seen allmost flat with the groud surface. Picture a huge rounf boulder buried undergound with just a portion of one surface exposed. Out croupings are a much more jagged edge type of outcropping. Most of what is in the picture abouve is outcroppings.
At least that is the way I use them, I am sure many other will chime is and show some pictures.
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