This is a typical scene from shortly after a funeral.
The flower car will have arrived first, and the flowers
will be arranged around the grave site by people from the
mortuary. Earlier that day, the mound of dirt will have
been covered with astroturf, as will the bare ground
surrounding the actual grave. The hearse, at the head of
the slowly proceding funeral procession, will then
arrive, and the pallbearers will carry the casket to the
grave, placing it on a set of straps across the hole that
it will be lowered into, usually after the mourners are
gone.
This photo shows the casket after it has been lowered
into the grave. Note that there is plenty of room left
for another one on top, which is commonplace in most
American cemeteries today.
One student found these cement casket liners at the
very edge of one end of the cemetery.