石化した
ancient
arid
bark
bead
brown
cambrian
close up
closeup
color
colorful
cracked
crystal
detail
dry
evolution
example
extinct
forest
fossil
fossilized
geology
hard
log
million
mineral
national
natural
nature
object
old
ornamental
paleontology
pattern
piece
polished
prehistoric
prehistory
research
rock
sample
section
sedimentary
shiny
slice
solid
stone
time
tree
wood