Unidentified stone with unexplained formation

[westtexas100]

Greetings! This is my first post, so i apologize if it is a bit sloppy. This stone was found near Marathon, Texas. We cannot figure out what could have made it to have such an odd formation on the top of it. Man made? Shaped by nature? Any info would be greatly appreciated. Thanks!

 

[recondigger]

I have no idea but man it is cool

 

[nuggy]

I guess it's probably what is known here as a concretion, but it is super cool - looks like an alien relic ! Nuggy

 

[woodstock]

A worm with a degree in Engineering Woodstock

 

[bigfoot1]

a guess...clay or carvrd rock cattle ranch sign.indicates brand....perhaps J lazy H or the like...

 

[Gold Maven]

Very unusual. Is it stone for sure?

Uniquely cool. Anything similar in the area?

 

[dennco2000]

Are you sure thats a stone and not pottery? It definitely looks man made.

 

[Got_4by4]

I agree.....Pottery shard. Look for more pieces in the same general area.