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Crinoid fossil or starfish fossi


Billymacdaddy

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Hi everyone, Billy Mac again.  My family was picking through the Marcellus Shale formation in Tully Ny several years ago.  We find trilobites, Cephalopods, bivalves, and lots of Crinoids there.  One of the boys found this small fossil that looks like a starfish.  The Crinoids typically have a ring around the star shape but this does not.  I tried getting some close ups but lacking a macro lens I had a hard time.  I hope the pics are ok.  The fossil is only about 6mm round.  So starfish or Crinoid is my question.  Thanks for any help.

 

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This actually looks more like Devonaster sp.  to me. :unsure: 

 

criniod2-horz.jpg

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The lumen is small enough to pass for a starfish madreporite, but to leave an impression like this it would have to be very robust.

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I am going to be the odd man out and maintain that I do not see Devonaster here. The terminations of the "legs" are nothing like what presents in a starfish. I am still going Pentacrinus on this one, sorry guys :/ 

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Jay A. Wollin

Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve

Hamburg, New York, USA

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The specimen looks to have a curvature, curving arms, at least that's what I'm seeing in the pictures. It may be just an optical illusion, I don't know.
I have never seen crinoid columnals with curved facets.

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

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And Pentacrinus / Pentacrinites occurs from the Triassic to the Eocene.

This is Devonian strata.

There are star shaped crinoid stems in the Devonian, but this still looks starfish to me. :)

 

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2 hours ago, Tidgy's Dad said:

And Pentacrinus / Pentacrinites occurs from the Triassic to the Eocene.

This is Devonian strata.

There are star shaped crinoid stems in the Devonian, but this still looks starfish to me. :)

 

That's my mistake, I was confused with the name. I know I've found them in the Hamilton, but am having a hard time finding the right match.

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Jay A. Wollin

Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve

Hamburg, New York, USA

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2 minutes ago, DevonianDigger said:

That's my mistake, I was confused with the name. I know I've found them in the Hamilton, but am having a hard time finding the right match.

I understand, but you are right in that there are pentameral, star-shaped crinoid stems about at this time, so you may be right. 

But I still think it's Devonaster ! :D

Life's Good!

Tortoise Friend.

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2 minutes ago, Tidgy's Dad said:

I understand, but you are right in that there are pentameral, star-shaped crinoid stems about at this time, so you may be right. 

But I still think it's Devonaster ! :D

 

I will be the first to jump for joy if it is a Devonaster. I have been looking for one for years! From everything that I've seen they just have a very distinct almost corn-on-the-cob-like appearance. 

 

10320026856_8b1c473d3c_b.jpg.42fb66e5fa9aedac25def19f4c303955.jpg

611683-large.thumb.jpg.e7fc58bd8eb1df8f991c931b83428ac1.jpg

034777-large.thumb.jpg.937d5d8e9940762da90b10b67ec58b56.jpg

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Jay A. Wollin

Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve

Hamburg, New York, USA

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Star shaped crinoid columnals that I find from The Devonian of NY are Thylacocrinus clarkei.  Its not a starfish. 

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2 hours ago, mikeymig said:

Star shaped crinoid columnals that I find from The Devonian of NY are Thylacocrinus clarkei.  Its not a starfish. 

Thanks for this, Mikey.  Looks like you nailed it!  :) 

I Googled Thylacocrinus clarkei, and came up with this post from the Forum in 2017. 

I agree, this is the likely ID. Good job!

@DevonianDigger

 

5970c7c5d56fd_Thylacocrinusclarkei.jpg.ff22ee16e6abea18f16620511aec9b4d.jpg

 

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"In every walk with nature one receives far more than he seeks."
John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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4 hours ago, mikeymig said:

Star shaped crinoid columnals that I find from The Devonian of NY are Thylacocrinus clarkei.

Can you post an image of one of the Thylacocrinus clarkei columnals you've found, showing its facet, for comparative reason?
Thank you.

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

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On 4/1/2019 at 2:24 AM, DevonianDigger said:

Do we have a starfish expert on the forum? This one is going to drive me nuts!!! Maybe @GerryK has an idea. As much as I hate to draw his attention to my misuse of the Pentacrinus name, lol.

Well done, you were right, good call! :)

Life's Good!

Tortoise Friend.

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Cropped, enlarged, and contrasted:

 

image.thumb.jpeg.467a69adc4bedaced76ad1f39f2354e6.jpeg

 

 

    Tim    VETERAN SHALE SPLITTER

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__________________________________________________
"In every walk with nature one receives far more than he seeks."
John Muir ~ ~ ~ ~   ><))))( *>  About Me      

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On 4/2/2019 at 6:43 PM, abyssunder said:

Can you post an image of one of the Thylacocrinus clarkei columnals you've found, showing its facet, for comparative reason?
Thank you.

Sorry, I just saw this request. 

DSC07403.JPG

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Many times I've wondered how much there is to know.  
led zeppelin

 

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3 hours ago, mikeymig said:

Sorry, I just saw this request. 

Very nice pluricolumnals! :)
Now they can be used as reference.
Thank you for the picture.

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

My Library

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Found this photo one with the "arms" less robust as the specimen in question. It's a crinoid columnal.

 

cr1.jpg

 

 

Edited by Mark Kmiecik
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Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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