2 Middle Devonian Unknowns

[bockryan]

OK first is a find from near Lebanon, NY from a quarry that exposes rocks from the Moscow formation of the Hamilton group. This was the most recent NYPS field trip actually. I have not seen this variety of shell before. I assume it is some type of bivalve. I also did not see an obvious match in the Field Guide to the Devonian Fossils of New York nor in the excellent Middle Devonian album @Jeffrey P has put together. Any ideas? I will tag @Darktooth and @Fossildude19 as well as veteran NY Devonian collectors.

 

 

 

 

 

 

The other one I am pretty sure about - this comes from a huge slab of limestone at the construction site at my parents' new house/subdivision in Commerce Township, Michigan. The site is built on a gravel quarry and this slab is the only limestone I have seen, so it is either:

 

a. the underlying bedrock

b. glacially transported

c. moved by people for some reason

 

Mine looks almost exactly like Concardium cuncus both in form and preservation from this image, again from @Jeffrey P's Middle Devonian album:

 

Given that similarity, I am tempted to say that my limestone is also from the Dundee Formation, as it is also present in Michigan. I found some unidentified brachiopods as well, which I have posted in case that is indicative. Any other ideas or opinions? My initial thought was a gastropod, which maybe remains possible?

 

 

 

 

 

 

[Fossildude19]

Hey Ryan,

I think your first item is the pteriomorph bivalve,  Palaeopinna flabellum. (Although, I would not completely rule out Lunulicardium clymeniae )

Your second item is definitely from the Dundee formation, and is the rostroconch, Concardium cuncus.

I think the white, Dundee Fm. brachiopod is a strophomenid. Not sure which one, though.

Maybe Brachyprion sp?

 

 

 

Plate from Linsley 1984.

[FossilDAWG]

15 minutes ago, Fossildude19 said:

Your second item is definitely from the Dundee formation, and is the rostroconch, Concardium cuncus.

I think the current name for these is Hippocardia cunea (Conrad, 1840).  See Hoare 1989 Taxonomy and paleoecology of Devonian rostroconch molluscs from Ohio.  Journal of Paleontology 63 (6): 838-846.

 

Don

[bockryan]

Fantastic, thank you so much! I agree re the brachiopod, I'm sure I can get a good ID once I dive in a little more, I have a few more plates of them that I haven't looked at closely yet. One trilobite pygidium as well, although in terrible shape. Still, will try to smash the whole block up next time I'm home, it seems to be packed with fossils and maybe other cool things will pop out.

[bockryan]

6 minutes ago, FossilDAWG said:

I think the current name for these is Hippocardia cunea (Conrad, 1840).  See Hoare 1989 Taxonomy and paleoecology of Devonian rostroconch molluscs from Ohio.  Journal of Paleontology 63 (6): 838-846.

 

Don

 

Thanks Don, extremely helpful  This is the first and only rostroconch in my collection so far

[doushantuo]

good find !!!!

[TqB]

25 minutes ago, FossilDAWG said:

I think the current name for these is Hippocardia cunea (Conrad, 1840).  See Hoare 1989 Taxonomy and paleoecology of Devonian rostroconch molluscs from Ohio.  Journal of Paleontology 63 (6): 838-846.

 

Don

It's changed again, to Hoareicardia cunea.

In: N. S. Rogalla and M.R.W. Amler. 2006. Revision der Familie Hippocardiidae Pojeta & Runnegar, 1976 (Mollusca, Rostroconchia). Paläontologische Zeitschrift 80(3):238-276

(I haven't got this one.)

[FossilDAWG]

Thanks!  I found the paper, but it's in German and Google Translate does not do well with scientific terminology, so I have to go by the photos.  Well, or else learn to read a very specialized literature in German.  Anyway I also have to wonder when every single species is now in its own genus.  Is that justified, or is it another case of over-splitting?  

 

Don