Petrified wood or oyster/clam shell?

[cajundetector]

Found in a gravel pile nearby my work. Looks like wood but may be a shell and wishful thinking on my part. Totally clueless with regard to fossil hunting although I am researching and have a couple of hunts planned. Any insights are greatly appreciated!

 

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[antmike915]

Looks like part of a shell

 

[cajundetector]

Looks like part of a shell

Agreed. Thank you!