Reply #153: Since Pepperbelly offered no data.... [View All]

No, I can't. I can tell you that sandstone is any stone made of sand, sand being grains of either minerals or rock fragments between 0.0625 and 2.0 mm. Sand can be made of any mineral and be any color. All that matters is that it is between 0.0625 and 2.0 mm. If it's smaller, it's silt, if it's larger it's pebbles.

There are CLEAR laminae that parallel the laminae in the surrounding rock, and they appear to be dipping in the same direction. The "Albedo problem" Pepperbelly aluded to is almost certainly a result of two factors, angle of the rock face in question, and staining from dust that was blown out of the cracks.

It's almost certainly a chunk of in situ sandstone experiencing exfoliation (like its neighbors), that has the cracks surrounding it less full of dust, making it appear to be on top of the soil, rather than within it.