the best known example of pith casts are in the Carboniferous sphenophyta calamites and
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The best known examples of pith casts are in the Carboniferous Sphenophyta (Calamites) and cordaites (Artisia).
Explanation:
A subset of such fossils are pith casts, where the centre of a stem is either hollow or has delicate pith. After death, sediment enters and forms a cast of the central cavity of the stem. The best known examples of pith casts are in the Carboniferous Sphenophyta (Calamites) and cordaites (Artisia).
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