The separation or overhang as JonF says it really is, without offering evidence or reasoning,
I thought it was so obvious that none was necessary. But since it's you... you wrote:
showing that the layers are separated from each other, not laid neatly one on top of the other as you see in fresh deposition
Separation is defined as:
quote:1. an act or instance of separating or the state of being separated. 2. a place, line, or point of parting. 3. a gap, hole, rent, or the like. 4. something that separates or divides.
"Separation" would mean gaps or something inserted between the layers (and the latter would be a layer in itself). I.e. layers floating in the air above each other. The layers are laid on top of each other, touching with no gaps. At the edge of the cut some layers were affected differently than others and formed overhangs. Neat or not, they are laid on top of each other, not separated.
Let's see your evidence and reasoning that they are "separated". I need a good laugh.
Yours is far too vague. Details. When and how did the original rocks formed, when and how did they get eroded, When and how did did the get buried deep enough to form metamorphic rock, when and how did they get exposed to the surface, when and how did they get eroded again, when and how did they get buried deep enough to form metamorphic rock, again,and when and how did they get exposed again.
We have detailed and physically possible answers to all those questions, and as a bonus those answers fit with everything else we know.
It just underscores your incredible ignorance of relevant processes. Large temperature changes, or addition or removal of material can change volume. Extreme pressure (which is applied "hydrostatically" or from all directions simultaneously can reduce volume in some cases. Stretching... not so much.