Belated DSR Report: Part I - Bivalvia

[Peat Burns]

These were collected on the TFF DSR trip last spring.  I'm just now getting around to processing the fossils.  I'll start with the bivalvia, because they were the primary reason I wanted to go to DSR (and to meet fellow forum members, of course!).  My phone editor doesn't have italics, so the names on the photos are not italicized.  Scale is in mm.  If you see a specimen that is misidentified, please let me know.  I have also included some for which I don't yet have a confident ID.  Please chime in if you know them.

 

 

 

 

 

 

 

 

 

 

 

 

Not sure on this one.  Shaped like Prothyris but has radial striae.

 

 

Not sure on this one...

 

 

Paleoneilo.  Which species?

 

 

Not sure...

 

 

Not sure...

 

 

Not sure...

 

 

Sharp angle at posterior end is throwing me off...

 

 

 

 

 

[Peat Burns]

And the last one

 

And a photo of the site and participants:

 

[connorp]

Wow this was quite the haul! I particularly love the Orthonota.

[Misha]

Awesome finds!

I am hoping to get out there this summer, mostly for the bivalves and gastropods.

 

[Peat Burns]

1 hour ago, connorp said:

Wow this was quite the haul! I particularly love the Orthonota.

Yeah, thank goodness I got one (and a good one).  The other species of which I'm particularly fond is the Grammysia bisulcata.  It kind of reminds me of the freshwater Unionid Amblema plicata.

1 hour ago, Misha said:

Awesome finds!

I am hoping to get out there this summer, mostly for the bivalves and gastropods.

 

Thank you.  

 

I've never seen such Paleozoic bivalve diversity as present at DSR.  The rest of the goodies were icing on the cake. 

[Pemphix]

Nice !

[Mediospirifer]

10 hours ago, Peat Burns said:

Not sure on this one...

 

 

Looks like Glossites of some species to me.

 

10 hours ago, Peat Burns said:

Paleoneilo.  Which species?

 

 

P. filosa, I think.

 

10 hours ago, Peat Burns said:

Not sure...

 

 

Tellinopsis subemarginata.

 

10 hours ago, Peat Burns said:

Not sure...

 

 

Might be Paleoneilo emarginata, but the diagnostic end is missing. Is there a shallow crease from the beak to the missing margin? It's hard to tell from this angle.

 

10 hours ago, Peat Burns said:

Sharp angle at posterior end is throwing me off...

 

 

One of my favorites! Orthonota parvula. Not in the Wilson guide to NY Devonian fossils, but does appear in Linsley's NY Devonian fossil guide. 

 

You found some very nice specimens on that trip. 

 

[Ludwigia]

Excellent collection results and great photos! Thanks for sharing.

[Ruger9a]

Ditto!  I'm impressed.

[Monica]

Beautiful bivalves!!!  

[minnbuckeye]

What an astounding collection of bivalves! Were most in need of prepping or did they split out of the matrix as pictured? 

 

 Mike

[FossilNerd]

So jealous! Brachiopods abound in my area, but I’m sorely lacking in bivalves! 

[Peat Burns]

@Pemphix, @Ludwigia, @Ruger9a, @Monica, @FossilNerd Thanks very much!

 

@Mediospirifer, thanks so much.  Very helpful! 

 

@minnbuckeye.  Many came out pretty clean and needed only slight prep.  Others were almost completely unexposed and needed full prep (which i love because I'm more likely to end up with an unblemished specimen).  Did you get my PM about Keokuk brach identification? 

[Nimravis]

Great finds Tony, love how you preped some of them out and the pics are great.

[RuMert]

17 hours ago, Peat Burns said:

never seen such Paleozoic bivalve diversity

Exactly. Good preservation too

[Jeffrey P]

Good to see that others appreciate the bivalves from a remarkable site as much as I do. As far as the IDs, #1 I'm unsure, a few possibilities, but I would need a top down picture to know for sure. #3 is Nuculoidea corbuliformis. I agree with yours and Diane's IDs. You scored a lot of nice specimens there. Also, wonderful photos. Congratulations.  

[minnbuckeye]

7 hours ago, Peat Burns said:

 Did you get my PM about Keokuk brach identification? 

 Yes I did! Thank you. I see you didn't get my response. I forget to hit send quite often.Such was the case with this.

[Peat Burns]

5 hours ago, Nimravis said:

Great finds Tony, love how you preped some of them out and the pics are great.

Thanks, Ralph 

2 hours ago, Jeffrey P said:

Good to see that others appreciate the bivalves from a remarkable site as much as I do. As far as the IDs, #1 I'm unsure, a few possibilities, but I would need a top down picture to know for sure. #3 is Nuculoidea corbuliformis. I agree with yours and Diane's IDs. You scored a lot of nice specimens there. Also, wonderful photos. Congratulations.  

Thanks, Jeff.  You're so lucky to live relatively close to that site and that it is still accessible. It's amazing. I love palaeozoic molluscs. I appreciate your help when we were at the site and with the IDs and confirmations that you provided herein.

[Peat Burns]

There was one more hiding in with the brachiopods.

 

Pterinopecten conspectus

@Mediospirifer, @Jeffrey P do you agree with that assignment? (Scale in mm)

 

[Jeffrey P]

I have to do more research, but my preliminary judgment is that is a correct ID. I confess I've never seen that genus/species from DSR. So, as far as I'm concerned it is a new bivalve species for the site. Big congratulation Tony!

[Peat Burns]

52 minutes ago, Jeffrey P said:

I have to do more research, but my preliminary judgment is that is a correct ID. I confess I've never seen that genus/species from DSR. So, as far as I'm concerned it is a new bivalve species for the site. Big congratulation Tony!

Woo woo!  That's awesome.  Thanks, Jeff 

[Mediospirifer]

On ‎6‎/‎14‎/‎2020 at 10:53 PM, Peat Burns said:

Pterinopecten conspectus

@Mediospirifer, @Jeffrey P do you agree with that assignment? (Scale in mm)

 

I can't really say, I don't find as many pectens complete enough to be identifiable, so my eye isn't trained to spot the differences yet. And there are a myriad of pectens in the Linsley reference!

 

It's a beautiful specimen. The intact valve has a curious mark on the midline, about 2/3rds from the margin, that looks to me like something chipped the edge of the shell and left a scar. Too bad the other valve is missing that area, it would be cool to see if that feature was present on both valves! It could be the scar from a nautiloid bite.

 

Very cool piece!

 

[Tidgy's Dad]

Marvelous finds. 

The diversity is astounding for the Palaeozoic as has been mentioned. 

[Wrangellian]

What Adam said. It looks like you were lucky to score so many different species from that spot, but that spot has a high degree of diversity in many things, I understand. Especially considering the bivalves only became more dominant in the Mesozoic and Cenozoic - I think it beats the number of bivalve species I can find at my local Cretaceous site!

[Peat Burns]

On 6/11/2020 at 8:37 PM, Peat Burns said:

Not sure on this one.  Shaped like Prothyris but has radial striae.

 

 

I think I figured this one out.  Unfortunately, the shape of the valves is difficult to determine because they are folded about midway.  I think this is Grammatodon hamiltoniae.

 

Here are some additional pics. Note that the striae are interupted by the edges of the lamellae.

 

Here's a commisure view showing how the margin of the valve is folded backward toward the hinge.

 

@Mediospirifer, @Jeffrey P