Jump to content
Missourian

Mystery Fossils (Pennsylvanian)

Recommended Posts

Missourian
17 hours ago, sTamprockcoin said:

Reminds me of my #1 fossil/mineral hunting rule  stop to look for the unusual in the usual places. Congrats on the finds and the diligent research!

 

Indeed. I'm just glad I had the presence of mind to pick up the odd-looking slabs along with the other fossils.

Share this post


Link to post
Share on other sites
Plantguy

Got nothing to add except that I've been apparently asleep or at least nodding off at the kitchen table while you've been exploring and posting about the countryside. Great thread! Enjoyed the photos, research and analysis. Aint got anything close to that aged material around here but I was staring at some telephone post tailings the other day wondering about their origin..no algae or structures like yours, just pondering its accumulation and the fossils within. 

 

Regards, Chris 

Share this post


Link to post
Share on other sites
Missourian
On 4/21/2019 at 7:43 AM, Plantguy said:

Got nothing to add except that I've been apparently asleep or at least nodding off at the kitchen table while you've been exploring and posting about the countryside. Great thread! Enjoyed the photos, research and analysis. Aint got anything close to that aged material around here but I was staring at some telephone post tailings the other day wondering about their origin..no algae or structures like yours, just pondering its accumulation and the fossils within. 

 

Regards, Chris 

 

Sometimes wondering & pondering are all that are needed. Once something takes hold, it can be unstoppable. :)

Share this post


Link to post
Share on other sites
Missourian

Marine garden:

 

P-010_IMG_4904_half.thumb.jpg.ef85f1bfbad0f0bb9967edc520a31bc6.jpg

 

This is a 'worm's eye' view of pahoeids/phylloid algae in growth position, i.e. the base/bottom sides are exposed here. On the left is a frond of fenestellid bryozoan that was overrun by the algae. A brachiopod can be seen near the top.

 

Accumulations of the thalli can be seen on the side of the slab:

 

P-010_IMG_4885_half.thumb.jpg.d96020540fc33f1c5f004c202d54fb46.jpg

 

Again, zoomed and in proper orientation:

 

P-010_IMG_4885_zoom.thumb.jpg.62362f4f11ec10078f96fbbd800f21da.jpg

 

Successive generations of algae are revealed. Sponges (dark ovals) can be seen sandwiched in between the layers.

 

This specimen was also shown in the original post of this thread:

 

http://www.thefossilforum.com/index.php?/topic/26021-mystery-fossils-pennsylvanian/

Share this post


Link to post
Share on other sites
Plantguy

Lots going on there...so just below the brach there is something that has a slight reddish coloration...is that another smaller brach perhaps or something else--can you tell? What about the other area in the lower middle left...looks granular like crinoidal debris or something else? 

5cc3c37f2231c_unknownsmissouriansthread.jpg.ebcd3c18f0f780bfa7a503878ffc4dea.jpg

I like looking at these crazy slabs...I could see staring at that outcrop for a while...

 

Regards, Chris 

Share this post


Link to post
Share on other sites
Missourian
12 hours ago, Plantguy said:

Lots going on there...so just below the brach there is something that has a slight reddish coloration...is that another smaller brach perhaps or something else--can you tell? What about the other area in the lower middle left...looks granular like crinoidal debris or something else?

[ ]

I like looking at these crazy slabs...I could see staring at that outcrop for a while...

 

Regards, Chris 

 

1)

 

4904-bottom.jpg.2308332e1b9a1f07d4bb28f75e85a09f.jpg

 

This is the scaly structure that covers thalli and other fossils on these slabs. Note it on the bryozoan on the left.

 

A close-up from another slab:

 

post-6808-0-14381800-1396863166.thumb.jpg.e0ced77f269b5deb55bb1c32a9fbdb6e.jpg

 

I've seen this stuff on fossils from many different sites across the metro area. I believe it is a diagenetic growth of calcite, but it is possible that it could be biogenic -- at least in part.

 

2)

 

4904-top.thumb.jpg.cf96dfc9a3a7c22cb88a921eecff58bc.jpg

 

I'm not sure of the identity of the tiny thing. I'm not even 100% sure the shell above it is a brachiopod or something like a Euphemites gastropod (I'll need to drag out the scope again at some point). Smaller fossils on these slabs are often difficult to make out because of the calcite coatings mentioned above.

 

What I could identify among the thalli on these slabs are sponges, encrusting forams, brachiopods (free and attached), horn coral, bryozoans, crinoids (debris) and gastropods. Filter feeders seem to dominate among the animal species. Their numbers are rather sparse in comparison with the plant thalli. Additionally, studies done at other algal reef sites indicate that these algae, once established, dominated the environment, which resulted in low biodiversity.

Share this post


Link to post
Share on other sites
Plantguy

Beautiful closeups..thanks for satisfying the curiosities! Regards, Chris 

Share this post


Link to post
Share on other sites
Missourian

In a post five years ago,

 

http://www.thefossilforum.com/index.php?/topic/26021-mystery-fossils-pennsylvanian/&do=findComment&comment=487647

 

I mentioned finding several pieces that I thought would fit together. They did, but I never got around to showing them. Better late than never....

 

Puzzle pieces:

 

P-015_3_IMG_0777_edit.thumb.jpg.b357e792210facadfb25db80d9386734.jpg

 

Assembled:

 

P-015_2_IMG_0762_edit.thumb.jpg.e3f7d345f47353b4ead5dbe56b391502.jpg

 

These pieces were found in situ.

 

A close up shows an attached bryozoan:

 

P-015_5_IMG_0782_edit.thumb.jpg.c62787d9d58ba4c6a90e25f4f651348b.jpg

 

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.

×