Does anyone know when it became common practice to use coffins? Surely with older burials, if the family could afford a grave, it is possible that the finances would not have run to affording a coffin as well, so would they not have simply been buried in a shroud, as is still common practice for males in several muslim countries?
If no coffin was used, then either they would have been able to fit more people into the grave, or else they wouldn't have to dig as deep.
D