I know the picture isn't the best example. Actually the shale I am thinking of is more gray to black in color. I have lot's of experience with shale from Lake Cumberland in Kentucky. At least 50% of the shore line is shale. The I was going to try to recreate some drill marks in the cut closer to the potral and mine entrance on the layout. This is somewhat what I want to accomplish. or this: I have played with the idea of a using something like a hair pic or comb to score the layers. I will have to do some experimenting.