Found at Oregon coast a few years ago. Near the pier in Old Town Bandon, Oregon... Ro

[hardscapes]

 

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[SkaBa]

Don't know what it is, but very interesting looking.

 

[Molewacker]

Am I correct that this is stone?

If like the cliffs near Beverly Beach, which are sediment/sandstone material, I'm thinking a piece of wood or other organic material left a impression after it rotted away.

JMHO -

 

[kingskid1611]

A keyhole to a rocky world?

 

[hardscapes]

Yes it's stone, the impression has what looks like bone marrow residue, and is shiny

 

[BosnMate]

It's certainly an interesting rock. I would have packed it home also.

 

[yaxthri]

I think the impression was left by an animal or more probably a fish vertebra. Any fossils found near the location you found it?

 

[ARC]

It is a rock used to mark exact spot of treasure chest...

Too bad it is in your dining/living room

 

[motel6.5]

Ancient Chinese boat ancher ,foumdoff Calif. coast also.
,

 

[rich f]

looks like a hide a key stone to me lol

 

[trdking]

Prehistoric Black Widow sat there?

 

[Charlie P. (NY)]

Ancient Chinese boat ancher ,foumdoff Calif. coast also.
,

For an eight foot Chinese boat?

No real idea - maybe sandstone that formed around a shark or skate vertebrae?