I have found a couple of partial jawbones and have tried my best to do all the research to help me identify them. Here is what I know about the area and what has been found:
San Jose Formation (Eocene) — San Juan Basin
Closest documented fossil sites (within a mile)
Pelycodus, Squamata-Paraglyptosaurus. Squamata-Saniwa
My father remembers when he was a child (about 70 years ago) a museum or university excavating a three-toed horse skeleton less than half a mile away. I’ve never known him to be wrong when it comes to local history.
General area fossil sites (within 50 miles) Cantius,Chriacus,Diacodexis,Diacodon,Didelphodus,Didelphodus,Hyracotherium,Leptacodon,Macrocranion,Miacis,Omomys,Paramys,Peradectes,Phenacolemur,Prodiacodon,Prototomus,Scenopagus,Thryptacodon,Viverravus;Reptiles-crocodile bones and teeth
There may not be enough of the fossils to identify, but I would appreciate any feedback.