Brachiopod, but which one?

[cngodles]

By far the most detailed Brachiopod I’ve found to date. The top impression, which isn’t shown, appeared to have two larger bands running down the center. The small piece in attachment 3 was somewhat of a steinkern or impression below it. Scale line is 1cm. Photos taken with a DSL through a microscope.

 

This came from eroded Limestone.

[caldigger]

I think @Tidgy's Dad would enjoy this one.

[Tidgy's Dad]

I don't know this formation, of course, and lots of these little productids look very similar. 

I would tentatively suggest Marginifera.

[hemipristis]

I have 2 of these guys. or what appear very similar, from the Deer Lake site in PA.  (Devonian Mahatango Fm).  Never did get an ID on 'em

[hemipristis]

54 minutes ago, Tidgy's Dad said:

I don't know this formation, of course, and lots of these little productids look very similar. 

I would tentatively suggest Marginifera.

Spot on, from what I can see after googling Marginifera

[Tidgy's Dad]

58 minutes ago, hemipristis said:

I have 2 of these guys. or what appear very similar, from the Deer Lake site in PA.  (Devonian Mahatango Fm).  Never did get an ID on 'em

Well, they won't be Marginifera, I'm afraid, the genus doesn't appear in the Devonian as far as I know. 

[ClearLake]

Not to muddy the waters, because @Tidgy's Dad is absolutely correct, these productids are difficult to ID, but you may also want to look at two other possible genera: Kozlowskia and Hystriculina.  Unfortunately one of the differentiating features is number and arrangement of spines, which do not appear to be preserved on your specimen (at least that I can see in the pictures).  Your specimen does have a nicely preserved interior and I have not found yet an illustration that looks just like yours.  I'm not sure if there is a publication that addresses your specific Group or Formation in Pennsylvania that might help you narrow down what has been previously reported, as I am referencing an Ohio publication (which should be pretty good for western PA) and Texas (same Pennsylvanian aged seaway at least).

[doushantuo]

Cngodles,that's some photography.

[cngodles]

At some point, I found a second one and I identified it as Eomarginifera longispinus. Here is a plate for it.

 

ID: CG-0162

Scale bar = 5 mm.