What’s in this rock? Western CO

[sandhillhunter]

Saw this in this large sandstone boulder. Prehistoric? Petrified wood?

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[HairyScandinavian]

Looks like the rock's ear if the face is facing to the right.

 

[BBob]

Ammonite fossil

 

[Antares]

Concretion

 

[def90]

Mammoth balls

 

[TSAMP]

Dinosaur egg

 

[huntsman22]

petrified butt crack.... a big one.

 

[nobody]

petrified butt crack.... a big one.

Literally was about to post this, beat me to it dangit

 

[willtim]

Pretty cool looking.

 

[sierracharlie338]

Literally was about to post this, beat me to it dangit

 

[butcherboy]

Prehistoric Bigfoot sack. Post vasectomy.

 

[Will_m]

 

[HunterGatherer]

View attachment 966412

 

[nodakian]

Concretion

I agree it is something like this. We see them all over western ND.

 

[ReddingArcher]

View attachment 966412

That rock better chill!

 

[HuntHarder]

 

[Olsolitaire1]

Lots of smart a## folks with great answers here. Looks like Concretions, as stated above.
You can find all sorts of these concretions all around the area, if lucky you may find other types of fossils here as well.

Concretion - Wikipedia

en.wikipedia.org

 

[TaperPin]

Correct size, shape, and color of what a drunk sorority girl left on the asphalt next to our job site porta-potty at 2 am after discovering it was locked up. Quite honestly never looked at college girls the same after that. lol