石化した
aged
ammonite
ancestor
ancient
archaeology
biology
bone
bygone
carbon
creation
dead
deposit
dinosaur
eolith
evolution
evolve
excavation
extinct
extinction
forefather
fossil
fossilized remains
geology
impression
jurassic
mineral
mold
museum
nature
neolith
neolithic
paleolith
paleolithic
paleontology
past
petrifaction
petrified remains
prehistoric
prehistoric creature
prehistory
preservation
preserved
reconstitution
relic
remains
remnant
research
rock
science
skeleton
solid
specimen
stone
stone age
trace