Re: [dinosaur] I can't see the skull

"David Marjanovic" <[email protected]>
Newsgroups gmane.science.dinosaurs.general
Message-ID <trinity-e8a13969-a96f-4983-822c-ac48b3d644f4-1572386763608@3c-app-gmx-bap76> 
> What process causes the concretion?

Precipitation of minerals from groundwater in the acidic-or-whatever microenvironment created by the decay of soft tissue. (Remember that most fossils are fossils of rotting cadavers.) Or maybe just crystal growth on the skull itself.
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