Bite marks

[Rockin]

[Rockin]

6 minutes ago, Rockin said:

Found in my back yard after digging, very heavy for its size, bottom is flat,  smooth, house built in 1961, I'm second owner and never had any "fill or rocks"  added to property.

Just odd to find a solid rock here.

[Kane]

Very likely differential weathering. A fossil skull would have bone texture and bilateral symmetry, which this piece does not. I would class this as a dimpled stone, but not a fossil.

[Fossildude19]

Sorry, but not a skull. No bone textures. No sutures. No bilateral symmetry. No skull morphology.

This looks like a rounded river cobble, with the expected marks from repeated collision/percussion with/against other rocks.

[doushantuo]

fully agree with Kane and Tim

the result of geomorphological processes ( probably fluvial erosion, as Tim pointed out ,the result of collisional impact between particles 

But: I like it as it is, it's still a nice find 

 

[Rockin]

Thank you, those were  fast responses, and very much appreciated!