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I am looking for confirmation of the identity of this rodent jaw from the White River Group of NW Nebraska. I am thinking Ischyromys. Thoughts? Scale is mm. Occlusal view enlarged and not to scale. @jpc, @Fruitbat, @Nimravis

I collected thousands of micro Squamate (lizards, legless lizards and snakes) specimens from anthill matrix from my sons’ Eocene/Oligocene, White River Group, M&M Ranch in Nebraska in 2016 and 2017 that I donated to the Smithsonian Institution. I spent over 3,000 hours over a year and a half picking the specimens from the anthill matrix. All of the squamate specimens have been with a squamate researcher in Germany since late 2017/early 2018. Unfortunately Covid and two other major projects that the researcher was working on, a major Messel Pit publication and a climate paper, delayed the study of my specimens. However, based upon recent communications with the researcher, the study of these squamate specimens should begin in earnest this summer. Because my specimens closely span the Eocene/Oligocene boundary in Nebraska, the researcher is eager to use these specimens to describe in practice his climate theories and how climate affected the evolution of squamate species. I just had a major publication, Korth Boyd Person Anderson 2022 Fossil mammals from ant mounds situated on exposures of the Big Cottonwood Creek Member of the Chadron Formation latest Eocene early Oligocene Sioux County Nebraska, published this May on the mammal micro specimens from the M&M Ranch, that I donated to the South Dakota School of Mines Geology Museum, and look forward to a major publication on these squamate specimens. Below I’ll show a few of the donated specimens and hopefully use this thread to update the progress of the study and eventually the progress of the publication. Below are a few pictures of the anthills that the Squamate specimens came from. The Squamate researcher currently has specimens from 19 different anthill sites in the flats (latest Eocene to early Oligocene) of the M&M Ranch. Below are Squamate specimens from several of the anthill sites, so you can see the large quantity of specimens that I found from each anthill site: A few pictures of the lizard Specimens. Lizard skull cap: Lizard premaxilla: Lizard jaws: Lizard osteoderms. Glyptosaur osteoderms. These are the most common shape found. Note the variety of colors. Note these are not Peltosaurus per the researcher. Additional Glyptosaur (Not 100% sure of this ID)osteoderms of different shapes: Another species Osteoderm: A few pictures of some amphisbaenian (legless lizard) specimens. Amphisbaenian jaw pieces: Amphisbaenian vertebrae: Snake skull pieces and jaw pieces are rarely found as fossils because of their fragile nature. Snakes are typically described and identified by their vertebrae. Snake vertebrae: I also sent over 200,000 (number estimated based on weight and weight of 100 specimen samples) cranial and post cranial bone pieces/fragments that I could not recognize to the squamate researcher. He picked several thousand squamate cranial and post cranial bone specimens from these bone pieces/fragments that will also be part of his study. Below is a picture of these bones picked from a single anthill site, so you can see the quantity of these bones. Marco Sr.

Hi guys i have these brule fm jaws from sioux county, Nebraska and i was wondering if anyone could confirm if the Id's i have for them are correct, thanks 1.leptomeryx spp. would a species level be possible?

Hello TFF. This was brought to me today with no location info. It looks like Oligocene White River Group. Person who brought it in said it was collected by his grandparents who took trips to S. Dakota, etc. It is pretty "beat up". My first thought was Hyracodon from the White River Group. It's not Oreodont. Teeth are heavily eroded. The matrix is more reddish than anything I have collected in Nebraska, so maybe it's from S. Dakota? Thoughts? @Nimravis, @jpc (darn blurry pics. I even used a copy stand and timer...) Labial Lingual Occlusal (lingual side toward bottom)

Looking for confirmation or correction on this jaw fragment from the White River Group (Oligocene) of Nebraska. I have it as a Lagomorph cf. Palaeolagus. Scale is in mm. (Occlusal view on lower right is enlarged and not to scale).

Dear TFF members, I am seeking confirmation of the class and order of vertebrate to which these vertebrae belong. This is a ventral view. I am thinking turtle caudal vertebrae. White River Group. Nebraska. Oligocene. Scale in cm/mm

I'm looking for confirmation on this. I think it is Leptomeryx. The two occlusal views are the same but with different lighting. The other photos are labial and lingual views of the jaw. White River Group. Oligocene. Nebraska. Scale in cm/mm. Occlusal view not to scale. @Harry Pristis, @jpc, @Nimravis

Hello Everybody, I am wondering if someone can confirm which bone this is. It is from an Oreodont "bowl of spaghetti". It has articular surfaces on three sides (both lateral faces and the end / top). My guess is that it is a proximal end of a metapodial. Is that right? If so, can anyone provide more info (metatarsal or metacarpal, digit number (assuming II or III))? I have limited disarticulated mammalian foot bones for comparison. I have dog and cat, but I still am not sure based on the comparisons. Thanks for any help.

Hello! I was wondering if anyone might recognize this calcaneum from the White River Group of Nebraska. It is much larger than an oreodont. I have placed it next to oreodont calcanea for comparison. an articulated portion of the left foot of an oreodont is on top, middle is a single oreodont calcaneum, bottom is the unidentified calcaneum. (more pics to follow) An articulated portion of the left foot of an oreodont is on top, middle is a single oreodont calcaneum (right foot), bottom is the unidentified calcaneum (right foot). (more pics to follow)

Hello, Wondering if anyone can identify this bone and its "owner". Metatarsal / metacarpal? Horse (Mesohippus?)? Camel (Poebrotherium?)? Thanks for any help!