Charlie Smith
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Hello Nathan,
First of all, nice Brachiopod; I like how its perched on the matrix. After searching on fossilworks.org for Rhynchonellata (Brachiopods) in the Tonoloway Limestone from West Virginia, it revealed 4 species: H. congregata, C. litchfieldensis, S. zanuxemi, and S. keyserensis. The last two species, both belonging to the genus Spirifer, seem to be the most likely candidates. Spirifer often shows a broad sulcus in the middle of the brachiopod, which is also shown in your fossil. Out of these two species, I believe its Spirifer keyserensis, as Spirifer zanuxemi has been compared to a slightly more common Brachiopod, Spirifer cyclopterous, in this paper. However, the same paper contrasts the 2 by stating S. zanuxemi has less plications than S. cyclopterous. Judging from this Yale specimen, S. Cyclopterous has much fewer plications than your fossil, so I doubt it is S. zanuxemi.
I have to agree with Evan, that this just a rock. If it was found in some of the northeast or norhwest states in the US, or in Canada, It could be a rock known as Tillite. Tillite is a sedimentary rock formed when a glacier scrapes accross a land area, and deposits previously erroded material from elsewhere. The pink dot could be a drop stone, which is often found in Tillites. This photo: https://www.mindat.org/forum.php?file,11,file=71891 of a dropstone found in Ontario, Canada looks very similar to the one you posted, but a bit larger. Even though it may not be a fossil, it is still a pretty interesting rock sample.
