Up today are a couple of Brachiopod specimens that I collected recently from the Mahantango formation in central Pennsylvania. The first specimen is a mold of a flat valve with many thin, narrow radial ribs covering the surface. To me this looks like a specimen of Protoleptostrophia perplana because it is similar to specimens I have from the Silica Shale, and the Windom Shale which are both contemporaneous with the Mahantango formation (Devonian, Givetian stage). This specimen came from the Frame Shale member and was found in Seven Stars, PA.
The second brachiopod came from the Montebello mbr. north of Harrisburg, PA. It is a rynchonellid that looks very similar to the genera Uncinulus. It is rouned in the cross section and (seemingly) narrows to a point at the posterior. The problem is that there is not enough detail preserved on the anterior for me to see what the margin looks like. If it is a strong "U" shape then I would go with Unicinulus. If the margin is not as strongly shaped then it could be a variety of Camarotoechia.