[3] Peignecyon is an intermediate genus of thaumastocyonines, showing several features more derived than those of earlier taxa such as Ysengrinia and Crassidia, though less developed than in the youngest known members of the subfamily, such as Ammitocyon.

Albeit its morphology still resembles that of the Amphicyoninae, Peignecyon shows clear adaptions towards hypercarnivory, which are more developed than in earlier thaumastocyonines such as Ysengrinia.

Hot minerals springs shaped the site, at which an abundant amount of fossils belonging to various carnivorans were found.

This can likely be explained by the 'trapping effect': Predators were attracted to the carcasses of herbivores killed by the gases released by the mineral springs, only to succumb to the carbon dioxide themselves.

[1] Besides Peignecyon, three more amphicyonids were discovered: the large amphicyonines Paludocyon bohemicus and Amphicyon carnutense, and the small Dehmicyon schlosseri.

Other carnivorans include the small ursids Ballusia and Ursavus, as well as the larger Hemicyon, the viverrid Semigenetta and a variety of mustelids and procyonids.

Non-mammalian fossils include abundant turtle remains, and various accipitrids, the latter of which were likely met their demise due to the same 'trapping effect' as their mammalian counterparts.