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connorp

Pennsylvanian unknowns. Fish scales? + gastropod?

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connorp

Going through last year's finds I found a few things that I don't recognize. All are from Pennsylvanian marine limestone. The first few all appear to be fish material of some kind. I find plenty of chondrichthyan teeth, but none of these look like any teeth I've seen, although they may be partials. Possibly some kind of bony fish scale? All images were taken under a microscope, no scale cube but they all are about 1/2" at the widest point.

 

#1)

S20200213_004.jpg.fddf0af839779a56fdc575d83f99e4c6.jpg S20200213_005.jpg.ca8881a0b4723e05d8c14782fb63eb84.jpg

S20200213_006.jpg.f111d35b51981bf215d61c32e1797572.jpg

 

#2)

S20200213_011.jpg.8566b41e5b35975ab60c04fca3840ce7.jpg S20200213_012.jpg.6d27f25ef6fa3f412632cb38b8c40d72.jpg

S20200213_013.jpg.3f4f090588e10637bef8ef85d94d08ae.jpg

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connorp

#3)

S20200213_023.jpg.873c75f293012ab2454e2f7e2f38d85f.jpg S20200213_030.jpg.adb627f596345aecd68ff3e166b4e2dd.jpg

 

And #4 appears to a gastropod. It was on a block of matrix with a tooth that was in a vinegar bath, and I only noticed it after a few hours in the bath. So I'm guessing there's not enough detail for an ID, but was hoping it was possible to narrow it down, maybe even just to family or order. Not very impressive, but it's the only gastropod I've ever found at this site.

 

#4)

S20200213_035.jpg.7358e932167b3bf05aa21c9b29c7f284.jpg S20200213_038.jpg.864a154ff22b35bad38937e02464a54c.jpg

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connorp
14 hours ago, Fossildude19 said:

@jdp

 

Looks like paleoniscoid skull elements and possible scales. Something like Haplolepis sp possibly? 

Can't help with the gastropod cross section.  

Great finds, in my opinion.  :) 

Thanks for posting these.

That seems likely, not sure where else thick bony elements would come from. Are the holes in the elements anything specific to paleoniscids? They are present in all the specimens I showed, I've also seen similar holes in microfossils from the Pennsylvanian black shales I've searched, like the one below.

scales2b_excello.thumb.jpg.91b7e1d0fea6953da3bbbd0111d2d9df.jpg

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Fossildude19
5 hours ago, connorp said:

That seems likely, not sure where else thick bony elements would come from. Are the holes in the elements anything specific to paleoniscids? They are present in all the specimens I showed, I've also seen similar holes in microfossils from the Pennsylvanian black shales I've searched, like the one below.

scales2b_excello.thumb.jpg.91b7e1d0fea6953da3bbbd0111d2d9df.jpg

 

Well, the sheen from the black "holey" elements are very indicative of fish scales/bone/skull elements. 

Not sure if the holes are specific to paleoniscoid fish.  It could be that they are artifacts of erosion of thinner parts of the scales/bones. 

Some holes seem to indicate areas of interlocking components.

I know that the ornamentation on paleoniscoid fish can vary greatly. 

 

 

These elements seem more bone like, to me.  :headscratch:

 

scales2b_excello.thumb.jpg.91b7e1d0fea6953da3bbbd0111d2d9df.jpg

 

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