I have found only one specimen of the fossil brachiopod Nucleospira ventricosa from the Kalkberg formation but it is somewhat easy to recognize. The shell is oval in shape with a convex pedicle valve and a slightly convex brachial valve. the shell surface appears to be smooth but actually has a number of small bumps where spines would have been attached. No other ornamentation is visible on the shell nor is there any fold/sulcus structure.
Compare this fossil to Nucelospira conncinna from the Kashong Shale (Givetian stage of the Devonian). The above fossil was found in a roadcut near Shoharie, NY and came from the Kalkberg formation (Devonian, Lockhovian to Pragian stage).