What is this?

[Rww1987]

What kind of fossil is this?

 

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[Ninjafossils]

They look like internal shell casts, but also somewhat like bryozoan chuncks.

 

[Inyo]

Deleted by author.

 

[Rww1987]

Thanks Inyo, that's exactly what they are. I never known what they were. They did come out of the same spot as crinoids stems.