Sandstone piece - Layers and layers

Looking at various types of Sandstone and am fascinated by the textures and varieties.  I put down a general geometric pattern, added texture and carved line.

Added more lines for the layers and is getting really interesting.  Have been thinking about where the natural breaks would be, and though of using nylon cord for them, instead of just painting them.  Put in some rust wash for the red sandstone, and may not need to do much more.  The texture filled it out nicely.