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Estimating weight of a "fresh" bone from its fossil




Does anyone know the average density of unfossilized compact bone from,
say, a croc?

When someone reports the unfossilized weight of a T. rex skull, are they
usually basing this estimate on the cumulative densities of various bones
in the skull (compact bone , compact/porous bone, compact/porous/medulary
bone, etc.), or are they cutting a few corners and using the density of
compact bone, only?


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