Looks like no one added any tags here yet for you.
Mold
hollow cavity left in sediment after original fossil has dissolved
cast
mold is later filled with sediment
replacement
atom by atom replacement of organic matter by minerals
permineralization
void space in bone or teeth filled by minerals
body fossil
remains of a part of the organism
trace fossil
evidence of past life that doesn’t include organism itself
algal fruiting body
spherical
aragonite
sponge
porous
silica, calcite
tube shaped
coral
septae (solitary or colonial)
calcite & aragonite
echinoid
pentagonal symmetry
calcite
looks like a sand dollar
bivalve
bilateral symmetry between x-axis
calcite
looks like an oyster
gastropod
conical tube
calcite
mobile snails
ammonite
coiled on horizontal plane
calcite
marine molluscs (giant shell)
brachiopod
bilateral symmetry between y-axis
calcite
looks like a muscle
fusilinid
resemble grains of rice or wheat
calcite
leaf impression
carbonaceous remains of plant material between fine layers
liginin and cellulose
wood
replacement of wood by silica
lignin and cellulose
bark structure
bone
spongy inner bone structure
calcium