Can anyone tell me what this is?

[Grooveman]

Found on a ranch on SW Texas. Weight 64g. TIA!

 

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[NJearthman]

Dinosaur Gastrolith. https://en.wikipedia.org/wiki/Gastrolith Hey, it’s fun to imagine!

 

[Crabs]

Concretion.
https://en.wikipedia.org/wiki/Concretion

'Crabs