As the bone decays is is replaced by a chemical sedimentary rock formed by water seeping in and precipitating particles that eventually form the rock or fossil.
(the bone; decays; ) (particles; form; the rock or fossil; T:eventually) (a chemical sedimentary rock; formed; by water) (water; seeping; L:in)
the bone particles a chemical sedimentary rock water
decays form formed seeping
the rock or fossil T:eventually
by water
L:in