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rudist bivalves
An extinct group of coral- and horn-shaped bivalves (Bivalvia, subclass Heterodonta). They have a variable morphology and many species are not easily seen to be bivalves. They are adapted to a ...
trace fossil
A biogenic sedimentary structure formed by the behavioural activity of an animal on or within a given substrate. The study of trace fossils is called ‘ichnology’. Traces are most frequent at the ...
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