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trace fossils(30)
trace fossil(23)
ichnology(6)
fossil record(5)
fossils(5)
marine fossils(5)
trace elements(5)
cambrian(4)
china(4)
phylogenetic analysis(4)
trace element(4)
a window(3)
abelisauroid theropod dinosaur(3)
abstractnon-technical explanationthe latter half(3)
accurate paleogeographic reconstruction(3)
amiid fish(3)
anembalemba member(3)
back-filled burrow(3)
berivotra study area(3)
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