ID: Ankylosaur Dermal Scute?

[JoeS]

Hi all, I saw this interesting specimen online.

It is labeled as Ankylosaur dermal scute, was found in the Hell Creek Fm., Hill County, Montana. Size is 4,8 cm x 3,2 cm (1.88" x 1.26").

These are the pictures provided:







What strikes me about this specimen is the shape of the bony base and the grained surface.

My knowledge about osteoderms is rather limited, so I was wondering if anyone can support or refine the given ID?

The only image I found so far that resembles that shape, as opposed to the flat sided scutes, is that of an thoracic osteoderm (https://www.researchgate.net/publication/276289070_Nuevas_evidencias_de_dinosaurios_de_la_Formacion_Puerto_Yerua_Cretacico_Provincia_de_Entre_Rios_Argentina):





Thank you for your time and help

Edited July 25, 2022 by JoeS
typos

[Troodon]

First if it was found in Hill County its from the Judith River Formation not Hell Creek.  Why locality is very important.

I'm more inclined to see a skull section with nodes from some Pachycephalosaurid given how thick it is and spongy looking.

[JoeS]

Indeed, yes it says Hill County twice in the description.

The nodes were putting me off as well - thanks for your quick reply @Troodon - much appreciated.

Edited July 25, 2022 by JoeS
missing link

[Troodon]

I just saw this Twitter post.   Your could be cf Stegoceras similar deposit