Weird Fuslinids or Oncoids/oolites surrounding shells?

[Samurai]

Location: Missouri

Age:Pennsylvanian 

Geology: Oread fm?

Hey here is a quick question regarding a limestone that I had found in Nodoway County. 

 

I belive it to be the Kereford ls as it is oolitic in spots but it also contains some ooids to large to be normal. For context I have found large Bellerophon gastropods, Ameura sp., Amphiscapha snails, and large broken clams in this layer. There are some surefire fusulinids its just these are too weird. 

 

I initially thought fusulinid but when I brought out the hand lens they looked like clam shell/algea coated in calcium carbonate. I posted it to another group and they were thinking fusulinids. Some are long thin and curved, which could mean crushed? Others are looking too spherical and no surfsce striations. I am unsure.

 

They just dont seem to have visible chambers that I have seen on other specimens

 

 

 

Here is a true Fusulinid probably Triticies

 

 

 

Here is another piece 

 

 

 

This one had different nucleous than the others

 

 

 

I do think some of these are possible fusulinids for sure but not all of these look right. I wish I had access to a thin sectioning machine then I would be able to tell these apart. I will post more of the odd thin shaped ones later when I get home.

 

 

 

[Fossildude19]

The photography is not really conducive to seeing what exactly you actually have there. 

I understand sometimes we do the best we can, but, conversely, really detailed photos would be more helpful.

 

 

Cropped, color corrected, and brightened:

 

 

 

 

 

 

 

 

 

[Samurai]

12 minutes ago, Fossildude19 said:

The photography is not really conducive to seeing what exactly you actually have there. 

I understand sometimes we do the best we can, but, conversely, really detailed photos would be more helpful.

 

 

Cropped, color corrected, and brightened:

 

 

 

 

 

 

 

 

 

Sounds good. I tried the best I could do without a microscope. Ill try to see if I can get better pictures.

 

 

 

For clarity I am refering to the ooids/spheracles with the black cores

I circled a few here

 

 

 

 

[Samurai]

Here is an update, I was able to cut through the lime with my angle grinder and polished them. There are no chambers like in fusulinids and sizes are all over the place and therefor I am going with oolites that concreted around brachiopod and clam shells being crushed on the beach when they formed. Due to some technically being over 2mm some count as pisoids/Oncoids. 

 

Bonus image of my Trilobite cephalon having normal oolites in the same layer with a small gastropod that was probably eating the remains before the sediment came in on the bottom right. 

Edited July 26 by Samurai

[Missourian]

The ooid-like grains are likely Osagia. These are encrustations of calcareous algae and forams around shell fragments or other debris. They indeed are oncoids/oncolites. They are abundant in the Farley Limestone, and are diagnostic of that unit in the KC area. Some examples:

 

 

 

 

[Missourian]

Osagia in cross-section:

 

 

Not my specimen. See illustration in:  https://www.kgs.ku.edu/General/Geology/Shawnee/W/04_penn.html

[Samurai]

On 7/28/2024 at 2:02 AM, Missourian said:

The ooid-like grains are likely Osagia. These are encrustations of calcareous algae and forams around shell fragments or other debris. They indeed are oncoids/oncolites. They are abundant in the Farley Limestone, and are diagnostic of that unit in the KC area. Some examples:

 

 

 

 

Thank you! I knew they didn't look like fusulinids. Also this was actually around Nodoway County Missouri with a black shale/ possibly coal? right above it, I couldnt dig into it too much since I left my rock hammer at home.