Shake holes are the hollows left when boulder clay is washed into fissures in the underlying limestone. Non-specialists seem to extend the term to the hollows created above the collapsed roofs of near-surface cave systems, or by dissolution of surface bedrock, but that's not strictly accurate; the latter are called dolines. Irrespective of specific term, the difference is that these depressions are in the overlying glacial drift deposits, whereas dolines are collapse structures in the bedrock itself.

Nuclear physicists are... different. I suppose it's logical to interpret these depressions as evidence of anti-moles.