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problematic fossils
Scope Notes: Before 1978, also search fossils AND (problematical OR problematic OR problematic organisms). Before 1981, Hyolithidae was included as a narrower term, now see Hyolithes. Before 1981 Receptaculitaceae was included as a narrower term. Before 2009 Dacryoconarida was included as a narrower term.
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problematical fossils
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