Middle Proterozoic (1.5 Ga) Horodyskia moniliformis Yochelson and Fedonkin, the oldest known tissue-grade colonial eucaryote - Fedonkin, Mikhail Aleksandrovich; Yochelson, Ellis León 1928- (Washington, D.C. : Smithsonian Institution Press, 2002)
Keywords: MICROPALEONTOLOGIA; MONTANA (ESTADOS UNIDOS); PALEONTOLOGIA