age
allonautilus
ammonite
ammonoid
ammonoidea
ancient
animal
antique
archaeological
archaeology
archeologic
archeological
archeology
cephalopod
earth
era
evolution
excavation
exoskeleton
extinct
fossil
fossilized
geologic
geological
geology
historic
historical
history
imprint
jurassic
marine
mineral
mollusc
natural
nature
nautilus
palaeontologic
palaeontology
paleontologic
paleontology
period
petrifaction
petrification
prehistoric
prehistorical
prehistory
shell
skeleton
snail
spiral