Brachiopod unknown

[minnbuckeye]

I collect in Coralville Iowa frequently and always run across these brachiopods. Yet I am unsure of their name in spite of investigation on line. They are NOT uncommon so the ID should be easy but eludes me. So here I am asking for assistance! They are flat as a pancake if that helps.

 

[MeargleSchmeargl]

Interesting...

[Raggedy Man]

You get these at the gorge? Or a quarry? Formation? Im assuming these are devonian? 

[Fossildude19]

Looks like a strophodontiid to me. 
Do you have this PDF?

It might give some possible candidates. 

Sorry I cannot be more helpful. 

 

[Raggedy Man]

Thanks @Fossildude19 The pdf I have is 46MB. Reason I asked for the formation so I can post the plates as they're different. The database is down atm from ISU that provides identification charts for the area he hunts. 

[Fossildude19]

@Raggedy Man

Tags say Cedar Valley Formation, and Devonian. 

I know, I miss them all the time too. 

 

[Peat Burns]

I think this one is Pseudoatrypa or Atrypa.  Not sure about the others. I'd have to "sit down" with them in hand.

 

[minnbuckeye]

 

 

Thanks @Peat Burns. I thought this to be a possibility but none of the matrix had any domed concave material. Yet, I must have collected close to 20 flatter pieces. This is why I thought it impossible for an ID.

 

Thanks @Fossildude19 for the pdf. Will take some time to  read and digest it's content.

 

 @Raggedy Man, Is the dog hanging in there? Hopefully not suffering. Collected these from a pile of rip rap to prevent erosion.

[Peat Burns]

2 minutes ago, minnbuckeye said:

 

 

Thanks @Peat Burns. I thought this to be a possibility but none of the matrix had any domed concave material. Yet, I must have collected close to 20 flatter pieces. This is why I thought it impossible for an ID.

 

Thanks @Fossildude19 for the pdf. Will take some time to  read and digest it's content.

 

 @Raggedy Man, Is the dog hanging in there? Hopefully not suffering. Collected these from a pile of rip rap to prevent erosion.

It's definitely one of those two.  I'll try to remember to look at the brachs I collected from the Coralville site you directed me to this summer and see if that sheds any light.  I might have some with both valves.

[piranha]

These should be useful.  The attached version of Day 1992 is keyword searchable.  PM sent for Stainbrook 1938. 

 

Day, J. 1992

Middle-Upper Devonian (late Givetian-early Frasnian) brachiopod sequence in the Cedar Valley Group of central and eastern Iowa.

Iowa Department of Natural Resources Guidebook Series 16:53-105

 

Stainbrook, M.A. 1938

Atrypa and Stropheodonta from the Cedar Valley beds of Iowa.

Journal of Paleontology, 12(3):229-256

[Peat Burns]

@minnbuckeye   I just noticed some other goodies in your specimens.  An inarticulate brachiopod, cf. Petrocrania (circled) and a microconchid, cf. Palaeoconchus  (arrow)

 

[Tidgy's Dad]

13 minutes ago, Peat Burns said:

@minnbuckeye   I just noticed some other goodies in your specimens.  An inarticulate brachiopod, cf. Petrocrania (circled) and a microconchid, cf. Palaeoconchus  (arrow)

 

Good spot! 

[Al Dente]

Atrypa iowensis is a large Atrypa that is found in the area.