incavation

noun4

1. •
   The act of making hollow.
2. •
   A hollow; a physical depression; a concavity.

   • This lip is in fact not a separate part of the pipe, but merely an incavation on the foot, having at its lower end the form of a tongue, as we see on fig. 1.-4 — 1855
3. •
   The act of caving in.

   • A case or curb to be used to prevent incavation in sinking wells and boring into loose ground — 1834
4. •
   An act of earthing artifacts; the burial or entombment of archaeologically interesting items.

   • Instead, what is incavated is archaeological evidence in itself, and incavations are thus about the very possibility of archaeology. — 2004