echinoderm or what?

[pcjr65]

this is 1/2" across, the opening is 3/8"

 

 

 

 

 

 

sandstone matrix, calcite thingamacallit found in Meade Co, KY about 300 feet above the Ohio River. Thanks for help 

[goatinformationist]

What was the name of that movie?   Ah yes, Aliens.  Don't get your face to close to this.

[FossilDAWG]

I think it is an upside down crinoid calyx with the basals missing, revealing a trilobite pygidium that drifted into the calyx at some point.   Ery unusual and cool fossil!

 

Don

[piranha]

Fossil of the Day!

[Wrangellian]

Seems to have 6-fold symmetry instead of 5. Is that normal, unusual, or...?

[Walt]

45 minutes ago, FossilDAWG said:

I think it is an upside down crinoid calyx with the basals missing, revealing a trilobite pygidium that drifted into the calyx at some point.   Ery unusual and cool fossil!

 

Don

That sounds like something I would say and be verbally horse whipped for 

[Walt]

That is a great find!  Very unique! 

[FossilDAWG]

29 minutes ago, Wrangellian said:

Seems to have 6-fold symmetry instead of 5. Is that normal, unusual, or...?

Good observation.  There are a few crinoids with 6-fold symmetry in the calyx.  For example Hexacrinus is a Devonian crinoid with that structure.

Don

[pcjr65]

34 minutes ago, Wrangellian said:

Seems to have 6-fold symmetry instead of 5. Is that normal, unusual, or...?

that's why I can't figure it out, or find another photo in my books or online. It's  a strange little dude. I thought it may be a mutation...

 

[pcjr65]

29 minutes ago, Walt said:

That is a great find!  Very unique! 

thanks! 

[crinoid1]

This appears to be a Talarocrinus sp. Perhaps T. sexlobatus. These do appear six-sided, as one of the six "sides" is the anal interray. 

 

 

[pcjr65]

Very nice. 

I think you got it!