Samurai Posted July 23 Share Posted July 23 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. Link to comment Share on other sites More sharing options...
Fossildude19 Posted July 23 Share Posted July 23 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: Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Samurai Posted July 23 Author Share Posted July 23 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 1 Link to comment Share on other sites More sharing options...
Samurai Posted July 26 Author Share Posted July 26 (edited) 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 1 Link to comment Share on other sites More sharing options...
Missourian Posted July 28 Share Posted July 28 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: 1 Context is critical. Link to comment Share on other sites More sharing options...
Missourian Posted July 28 Share Posted July 28 Osagia in cross-section: Not my specimen. See illustration in: https://www.kgs.ku.edu/General/Geology/Shawnee/W/04_penn.html 1 Context is critical. Link to comment Share on other sites More sharing options...
Samurai Posted August 3 Author Share Posted August 3 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. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now