Jump to content

Identification Help Requested ( Large Mississippian Bryozoa?)


Thomas.Dodson

Recommended Posts

Thomas.Dodson

Hi everyone,

 

These unidentified specimens were collected in Union County, Illinois. It's from Mississippian strata, likely the Ste. Genevieve Limestone or St. Louis Limestone. I haven't been able to track down a proper map of this quadrangle yet.

 

The smaller specimens resemble mound bryozoa like Prasopora and the cups of all of them display concentric layers like related bryozoans. There aren't any pores visible so I've been thinking about bisecting one of the smaller specimens to see if any radiating zooecia are visible.

 

What does everyone else think? Does anyone have any idea on what they are?

img1.png

img2.png

img3.png

img4.png

Link to post
Share on other sites
Thomas.Dodson

There were more obvious fluid vents in the site where these were collected so that seems very likely now that I think about it, especially given the variation and lack of any pore/cell structure. Very much appreciated.

 

In that case the concentric layers would represent infill structures of depositional events. While searching for variations in fluid vents I came across this interesting website on fluid venting systems. It's a good read for anyone wanting to learn more about these.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...