Fossilized Egg?

[romeo-1]

I posted this on the Fossil forum but thought I would take advantage of the expertise of the What is It forum as well. Thoughts?

http://www.treasurenet.com/forums/fossils/294981-fossilized-egg.html#post2783172

 

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[timekiller]

I've had the same thought in the past on them.Cause not many rocks found here on the coast where I live unless it's a foundation or ballast stones from sailing ships.At least not on the surface here they can be found around the big phosphate mine we have but the are digging on old marine life from millions of years ago and it's pretty deep digging.But the vein they work on does surface in places here.Anyway all that said looks like a concreation to me here's some like I find & some that's still in it's matrix I've found around here.The matrix is petrified mud.
Take Care,
Pete,

 

[Jason in Enid]

It's just part of a conglomerate stone. River worn rocks, trapped in mud that then becomes solidified into a new rock.

 

[romeo-1]

I'm going to take this into the geology department at the university I work at and have it cut open...it's possible that a piece of organic matter is the nucleus of many concretions...may be a seed, a bone, a tooth or just a blade of grass...

 

[cbac]

That bears a strong resemblance to a Gastrolith or Stomach stone.
Here's an article describing them.
The Great Cretaceous Walk: Why Eat a Rock? Gastroliths (‘Stomach Stones’) as Trace Fossils

I've a couple sitting around and took one to the local museum, their dinosaur specialist showed me their collection.
Apparently, much like birds, they swallowed rocks to aid in digestion.