Re: eggs with thin shells

[Crpntr@ix.netcom.com (Kenneth Carpenter)]

You wrote: 


>
> My reply now....  Yes the egg shell is thinned substantially by 
>compaction (>25 percent), but not through decalcification directly.  
>Impacting of quartz grains onto the eggshell surface has caused the 
>calcite to migrate through pressure solution into the surrounding 
>sediment.  This effectively thins the eggshell on the top and bottom  
>(at least in the eggs I have dealt with).  This produces an un-
>oxidised rim to the egg which is green as opposed to red (which is 
>the colour of most of the surrounding sediment).  The sediment is 
>cemented in these patches by a micrite (fine-grained calcite).
>


I stand corrected.