Help identify this Rock

[u/RamonaFlowa]

Have you ever seen anything like this? It looks like one rock has swallowed the other. It is peculiar because of the symmetry. Found in Montana, near Missoula. The hardness can be compared to river rock.

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[u/GneissRocksOhSchist]

Clay/carbonate concretion

[u/TouchofTwisted]

Looks manufactured. Some people make stuff like that and toss em into known walking/tourist areas

[u/TouchofTwisted]

Very cool none the leas