石化した
ancient
animal
animals
background
biology
brown
closeup
collection
cretaceous
echinodermata
evolution
exoskeleton
fossil
fossil sea urchin
fossilized
fossils
geological
geology
history
isolated
macro
marine
mineral
mollusk
natural
nature
ocean
old
paleontology
prehistoric
rock
sea
sea urchin
shell
stone
texture
urchin