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

[Ruben Safir <ruben@mrbrklyn.com>]

On 10/29/19 6:06 PM, David Marjanovic wrote:
>> 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.
> 


would that imply that trace elements of soft tissue are in the concretion?

BTW - I know it must  be obvious to others, after all PBS posted that
image, but I can't find anything that looks like bone or a skull in that
rock.  :(

I just can't seem to figure out how to read it.  If I cracked it open, I
would have ended up just tossing that ..

My ex-wife was stationed in Colorado at Kit Carson and found a very
decent ammonite down on the field.  It was about 6 inches long and a
round spiral.  Inside it was a dark mud stone.  I had seen a lot of
rocks like in the photograph, and never once had an inkling that they
might have fossils in them, although it obvious that, they being round,
had some process going on that made them form like bubbles.