Reference pack by atenitsky
http://www.fotoref.com/products/porous-limestone-cliffs-1?variant=2115643146264
5 3d samples of the location surfaces.
They are in a range of 500-1500k triangles per .obj Each goes with an 8192x8192 .tif texture.
These are not production/game ready. Essentially, it is raw photogrammetry to build your work upon.