Geobulletin alpha

Orthis? sp. brachiopods from the Kalkberg formation of New York 

I'm really torn on how to classify these next fossils from the Kalkberg formation. To my eye they look like Rhipidomella sp., which is very common in middle Devonian aged rocks, but I cannot find any literature that lists that genus as being found in the Kalkberg formation. What I have been able to find lists shells that look similar to these as belonging to the genus Orthis. Doing a little research on the Fossilworks.org website indicates that both Rhipidomella and Orthis are part of the same [...]