石化した
aged
ammonite
ancient
antique
archaeology
arthropod
biology
dead
detail
dirty
earth
era
evolution
exoskeleton
exploration
extinct
fossil
gastropod
geological
history
imprint
invertebrate
jurassic
layer
limestone
macro
mineral
mollusc
mollusk
nature
old
organism
paleontology
prehistory
real
research
rock
sand
sandstone
sea
shell
snail
spiral
stone
structure