Jump to content
ByronNWT

Crinoid segments or not a fossil?

Recommended Posts

ByronNWT

Found on blackstone river NWT Canada. Not sure what formation it is but its either devonian or cretaceous nothing between. My best guess is Fort Simpson formation so late devonian. 

D5853568-71D5-40D0-B5B1-B4A57BBD6F45.png

Share this post


Link to post
Share on other sites
ByronNWT

F3862C15-0D05-44B8-BC7B-1B782DB69C8C.thumb.png.80631e936248393d9ab0d7024a534026.png

Share this post


Link to post
Share on other sites
ByronNWT

Small piles about 4cm long. 

Share this post


Link to post
Share on other sites
ByronNWT

Full rock. It has many strange things on it i have never seen anywhere else in area.

5806A769-E5CE-425A-817F-A68F250226E3.png

Share this post


Link to post
Share on other sites
ByronNWT

Betterish

52F2D1C8-BC70-446B-9391-2120B42C7191.png

Share this post


Link to post
Share on other sites
Rockwood

I can't really come up with a guess better than crinoid pieces of some sort.

Share this post


Link to post
Share on other sites
Jasperfossils

I don’t see a crinoid in this, crinoids are geometrically divided in 5 sides, because it is an echinoderm. Crinoid discs can be round, five-sides and star shaped but, you can see a star shape just like sea urchins if they are not very damaged. Those on your photo are six sided, so it can never be an echinoderm.

Share this post


Link to post
Share on other sites
ByronNWT

I know thats why i was intrigued/confused as to what this is.

Share this post


Link to post
Share on other sites
ByronNWT

Could they be parts of a crinoid cup crushed? I think there are parts of cup that can be hexagonal in shape?

Share this post


Link to post
Share on other sites
Herb

looks like a busted up sea urchin to me

Share this post


Link to post
Share on other sites
Rockwood
1 hour ago, Jasperfossils said:

 Those on your photo are six sided, so it can never be an echinoderm.

I don't think this is an absolute.

Share this post


Link to post
Share on other sites
Jasperfossils
Posted (edited)

I don’t think that either. It is too thick to be a piece of a sea urchin, pieces of sea urchins are thin.

Edited by Jasperfossils

Share this post


Link to post
Share on other sites
Rockwood
1 hour ago, Jasperfossils said:

I don’t think that either. It is too thick to be a piece of a sea urchin, pieces of sea urchins are thin.

Sorry, but I don't think that is an absolute either. Some urchin spines are sizable units. 

Share this post


Link to post
Share on other sites
Mark Kmiecik
3 hours ago, Jasperfossils said:

I don’t see a crinoid in this, crinoids are geometrically divided in 5 sides, because it is an echinoderm. Crinoid discs can be round, five-sides and star shaped but, you can see a star shape just like sea urchins if they are not very damaged. Those on your photo are six sided, so it can never be an echinoderm.

Here's a crionoid calyx with several six-sided parts.

 

crinoid.jpg

Share this post


Link to post
Share on other sites
ClearLake
6 hours ago, Jasperfossils said:

don’t see a crinoid in this, crinoids are geometrically divided in 5 sides, because it is an echinoderm. Crinoid discs can be round, five-sides and star shaped but, you can see a star shape just like sea urchins if they are not very damaged. Those on your photo are six sided, so it can never be an echinoderm.

I think you are assuming they have to be crinoid columnals. There are lots of other parts to a crinoid, such as arms, cups, etc that could have pieces that are shaped similar to these. I’m not saying that proves they are crinoids, just saying it can still be in the running.  

Share this post


Link to post
Share on other sites
ByronNWT

Also on this rock 

D61975B2-4931-41B9-BE7D-4791E34029B1.png

Share this post


Link to post
Share on other sites
Spoons

Can OP provide a scale in the photos? I’m having a really hard time judging how large these “chrinoid pieces” are. 
 

My first reaction would be mineralogical in origin but as to what mineral it could be... :shrug:

Share this post


Link to post
Share on other sites
ByronNWT

The deposits are around 4cm long. Size of each “chrinoid” piece not really sure. Sorry my pictures suck.

Share this post


Link to post
Share on other sites
Spoons
5 minutes ago, ByronNWT said:

The deposits are around 4cm long. Size of each “chrinoid” piece not really sure. Sorry my pictures suck.

Nah it’s all good. We all start somewhere and my photography is nowhere near professional myself. 

Share this post


Link to post
Share on other sites
Herb

I see this type of groupings in the Miss. around here quite often, in areas of high echinoderm fossil concentrations, crinoids, sea urchins .

 

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.

×