ancient
bivalve
bivalvia
clam
different
dinosaur
early
embedded
fossil
fossilization
fossilize
fossilized
geological
isolated
lamellibranchiata
limestone
mesozoic
mollusk
neogene
old
oysters
palaeontology
palaeozoology
paleontology
paleozoic
paleozoology
pelecypoda
rock
science
seashell
shell
species
spilifer
stone
valve
variety