a zipper?

[naturegirl]

NE Okla...sandstone, I guess..about 4-5 inches long and 1/4 inch wide..it sure is sharply defined...any idea? pics suc, I'm going back if it really is an ichnofossil...what do you think?

thanks

 

[Ninjafossils]

Looks like a crinoid imprint

 

[naturegirl]

I didn't think crinoid...it has a zig-zap, I went back and got a clay impression of it

 

[naturegirl]

Got it...an Oyster, or clam commissure. Or something like that.

 

[old digger]

''Naturegirl'', I also believe it's a crinoid fossil. The half-circular segments have eroded out leaving the zipper like appearance.

 

[Charlie P. (NY)]

I'm with Naturegirl. Edge of an oyster perhaps.

Also possible it's a trace fossil of something having moved itself along and left that pattern as a track.

 

[PennyG]

That’s not a typical pattern for crinoid .