Id Needed For Some Oklahoma Concretion Fossils

[Missourian]

Another interesting one:

IMG_1337.JPG

IMG_1338.JPG

Any ideas?

Looks like a sailboat.

Otherwise, wow! I'd guess it has something to do with a fish fin.

[PetrolPete]

Looks like a sailboat.

Otherwise, wow! I'd guess it has something to do with a fish fin.

the weird part is how the lower part is smooth, but the upper part has striations running up to the tip

....which kinda makes it look more like a sailboat

[PetrolPete]

another interesting one, it kinda looks like an elongate petrodus of some sort. It's hard to see, but there are ridges running along the wall. Any Ideas?

[PetrolPete]

Missourian, those are some interesting spines. As for the big one my daughter is holding, I "found" it, but not in the field. It is the same one that was written up by Zidek in the paper I cited earlier. In that paper, it was said to be in a private collection. I was familiar with the paper when I happened to see it, and other Pennsylvanian vertebrate fossils, for sale by a fossil dealer. it turned out that he had gotten them from the widow of the collector. I bought the whole collection and donated it all to the American Museum of Natural History in New York after taking photos. This was about 15 years ago. The curator, John Maisey, gave me casts of the more interesting specimens, like the big Physonemus. The photo is the actual specimen.

PetrolPete, if the spine is completely nodeless, they could be worn off or it might be something else like Stethacanthus.

I've been trying to find a Stenthacanthus picture to compare it to, but I haven't had much luck. Any idea where to look?

Thanks again

[PetrolPete]

Here are some of the recent finds I posted in the trip page, but I'm putting them here too to see if they can get ID'd. Also note, I had to take these pictures rushed, so I'll try and some better ones later

This one was really interesting because it had symmetry and appeared to be made of tiny plates:

This one was really cool, but I have no idea as to what it could be:

Edited May 20, 2013 by PetrolPete

[PetrolPete]

I'm horrible at IDing cephalopods, so if anyone has any a good idea:

I'll need to add a better picture later but that one 'bone' in the lower right hand corner is interesting, it is V shaped and has a rounded split at one end:

Another one I have no Idea on

[PetrolPete]

And a couple more:

this one is kinda bowl shaped with some twisted nacre inside:

And this one is like one I've posted before, but I'm still not sure what it/they is/are

Thanks again for the help

Edited May 20, 2013 by PetrolPete

[Missourian]

This one was really interesting because it had symmetry and appeared to be made of tiny plates:

IMG_1361.JPG

I think this may be a weathered Lawrenciella.

Compare with these:

The 'plates' could actually be the 'cellular' structure within the cranium bones.

[PetrolPete]

you might be right. I can't do a good comparison though because it was found by a friend of mine and she has it. I'll let her know, thanks.

[PetrolPete]

Hopefully there pictures are betterIMG_1256.JPGIMG_1257.JPG

Could physonemus depressus (or something similar) be a possibility?

[Conostichus]

Image 1361 is almost certainly a paleoniscoid fish skull. Mark McKenzie and I (John McLeod) found these in the Missourian Graford Formation in some abundance. We misidentified them in the first version of our book Pennsylvanian Fossils of North Texas as possible shark skulls.  In the revised and expanded version (Color Guide to Pennsylvanian Fossils of North Texas) they were correctly identified with the help of Dr. John Maisey (AMNH).  At the time of publication the fauna was undescribed to Family level

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[Conostichus]

Some paleoniscoid braincase/skull pix from the Finis (Virgilian) and Graford (Missourian) respectively in North Texas (from CGPFNT)