ammonite
ancient living thing
ancient sea
ancient times
ann moen
anomalocaris
arthropod
burgess fauna
cambrian period
chambered nautilus
devonian period
discoverer
discovery
excavation
extinct organisms
extinction
fossil
husks
living thing
marine organism
mesozoic cretaceous
mining
mollusk
museum
ordovician period
paleontologist
paleontology
paleozoic silurian period
predation
rock
sea
shell
shellfish
stone
stratum
swims
univalve shell
unknown fossil
washington convention