Anyone know about these "nut" looking rocks?

[curious kat]

....they have a skin like layer and a core inside. How were they made? The white one is something else, not one of them.

 

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[Brian T. Booth]

....they have a skin like layer and a core inside. How were they made? The white one is something else, not one of them.<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=919394"/><img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=919395"/><img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=919396"/>

Just at a glance, looks to be chert nodules with a milky quartz pebble. One of the chert nodules looks to have a dendritic pattern on the surface. Great specimens.

 

[curious kat]

I did some research on these and from what I've read, think they're "concretions" rather than nodules...as they have a center core/speck that is built upon, make sense?

 

[Brian T. Booth]

I did some research on these and from what I've read, think they're "concretions" rather than nodules...as they have a center core/speck that is built upon, make sense?

That does make sense. I agree with your statement. I think these are concretions.

 

[wilfndgold]

Ha that ones a pot seed

 

[pippinwhitepaws]

Moqui Marbles

 

[curious kat]

...Thanks pippinwhitpaws, I looked up the Moqui Marbles and they're a bit different kind of concretion than mine. The ones I have don't have the "Ironstone" coating but are more lighter in color and more sandstone looking....although that little dark one does seem a bit different than the rest. Most of mine have the "bumps" on each end, but that little dark one has "indents" instead....so who knows, guess there's many kinds, thanks again!

 

[Backbacon]

Chert and quartz x2.

 

[DanB]

kinda look like gullet stones that passed through a dinosaur.... where they found in a deposit....db

 

[curious kat]

You think so DanB, wouldn't that be something! But I think they're just concretions....darn!

 

[old digger]

That white quartz colored one looks very much like a gastrolith (gizzard stone).

 

[curious kat]

...I wish it were old digger...we have many like it in all sizes. This is a Very quartz filled area. I found all of the concretions in different places around the property. Are those stones you posted from Dino's? Cool if they are! I wonder how they can tell?

 

[old digger]

Yes they are dinosaur gastroliths (gizzard stones). They are commonly found in one general area, and there is a unique polished surface to them.

 

[old digger]

Here is the kind of area that I find those gastroliths, and some in situ.

 

[curious kat]

...awesome old digger, what's the story on them? What exactly are "gizzard stones"...for those of us who don't really know about them?

 

[old digger]

Gastroliths (gizzard stones) were used in the like manner a birds do when collecting small rocks and using them in the process of breaking down seeds and other foods so that they can be fully digested.

 

[curious kat]

...thank you old digger for enlightening those of us who didn't exactly know!