Yes! Fossils are made when something living
dies and is buried in the ground -- it can
takes thousands of years for it to become a
fossil. Then when we dig them up, although the
original living thing is gone, we have a
mineralized copy of it (which is the fossil).
For example, if a clam dies and is buried in the
sand, over a thousands of years it might become a
fossil. As water flows through the rocks years
later, the shell will dissolve, but other minerals
in the water might replace the shell. This happens
so slowly that the fossil is formed to look
exactly like the original clam shell.