When deposited into fine layered mud, such evidence includes an impact depression beneath the dropstone, and indication that the mud has been squeezed up around the edges of the falling rock. Subsequent deposits of mud drape over the dropstone and its crater.
Upon being buried in a layer of fine sediment, this type of evidence is characterized by an indentation beneath the dropstone, as well as compression of the sediment around the edges of the falling rock. The subsequent sediment layers then cover the dropstone and its resulting depression.