Eosacantha
The species is known only from the Middle Eocene Parachute Member , part of the Green River Formation , in the Piceance Creek Basin , Garfield County , northwestern Colorado , USA . 
<triplet> Green River Formation <subj> Middle Eocene <obj> time period <subj> Colorado <obj> located in the administrative territorial entity <triplet> Garfield County <subj> Colorado <obj> located in the administrative territorial entity <triplet> Colorado <subj> Garfield County <obj> contains administrative territorial entity