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180 mya
segmented shell
minerals
oxynoticeras spp
palaeontology
pattern
permian
predators
quartz crystals
relative of nautiloids
sedimentary
septa
mesozoic
shallow seas
silicates
strata
stratigraphy
survived 200 mill years
sutures
texture
venter
worldwide
metamorphic
keel
ammonite
cretaceous mass extinction event
ammonoidea
ammonoids
ancient
bio stratigraphic
carnivore
cephalopods
closeup
coiled shell
correlation
darwin
jurassic
dating
environment
exoskeleton
extinct
faunal succession
fossil
gas filled
habitat
internal mould
involute
zone fossil
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