Jump to content
Billymacdaddy

Crinoid fossil or starfish fossi

Recommended Posts

Billymacdaddy

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.

 

image.jpeg

image.jpeg

image.jpeg

Share this post


Link to post
Share on other sites
DevonianDigger

Looks like Pentacrinus to me.

Share this post


Link to post
Share on other sites
Billymacdaddy

It sure does.  So type of Crinoid. Thankyou!  

Share this post


Link to post
Share on other sites
DevonianDigger

No problem. When I get home I will try to do a little digging and try to help you get a species.

Share this post


Link to post
Share on other sites
Fossildude19

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

 

criniod2-horz.jpg

Share this post


Link to post
Share on other sites
Tidgy's Dad

Nice Devonaster. for me too.

Great find. :)

Share this post


Link to post
Share on other sites
Billymacdaddy

Nice!  Thanks everybody.  Gotta love those comparative pics! :)

Share this post


Link to post
Share on other sites
Rockwood

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.

Share this post


Link to post
Share on other sites
DevonianDigger

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 :/ 

Share this post


Link to post
Share on other sites
abyssunder

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.

Share this post


Link to post
Share on other sites
Tidgy's Dad

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. :)

 

Share this post


Link to post
Share on other sites
DevonianDigger
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.

Share this post


Link to post
Share on other sites
Tidgy's Dad
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

Share this post


Link to post
Share on other sites
DevonianDigger
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

Share this post


Link to post
Share on other sites
DevonianDigger

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.

Share this post


Link to post
Share on other sites
Fossildude19
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

 

Share this post


Link to post
Share on other sites
abyssunder
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.

Share this post


Link to post
Share on other sites
Tidgy's Dad
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! :)

Share this post


Link to post
Share on other sites
Fossildude19

Cropped, enlarged, and contrasted:

 

image.thumb.jpeg.467a69adc4bedaced76ad1f39f2354e6.jpeg

 

 

Share this post


Link to post
Share on other sites
mikeymig
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

Share this post


Link to post
Share on other sites
abyssunder
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.

Share this post


Link to post
Share on other sites
Mark Kmiecik

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

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×