The Runningwater Formation is a geologic formation in Nebraska. It preserves fossils dating back to the Hemingfordian of the Early Miocene of the Neogene period. The sandstones and conglomerates of the formation were deposited in a fluvial environment. The formation has provided many fossil mammals.
Fossil content Among the following fossils have been found in the formation:Runningwater Formation at Fossilworks.org Mammals
Aletomeryx gracilis Arretotherium fricki Barbouromeryx trigonocorneus Cynarctoides acridens Cynelos stenosHunt & Yatkola, 2020 Diceratherium niobrarense Daphoenodon (Borocyon) robustum Desmocyon thomsoni Hypertragulus minor Menoceras barbouri Merychyus arenarum, M. elegans Metatomarctus canavus Osbornodon iamonensis Pseudoblastomeryx advena Anchitheriomys stouti Desmatippus tyleri Edaphocyon lautus Amphicyon galushai Craterogale cf. simus Leptarctus cf. ancipidens Leptocyon vulpinus Tephrocyon scitulus Merycochoerus proprius
Reptiles Macrochelys schmidti Rhineura marslandensis Sceloporus sp.
See also List of fossiliferous stratigraphic units in Nebraska Paleontology in Nebraska
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