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Runningwater Formation facts for kids

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Runningwater Formation
Stratigraphic range: Early Miocene (Hemingfordian)
~20.6–16.3Ma
Type Formation
Lithology
Primary Sandstone
Other Conglomerate
Location
Coordinates 42°24′N 103°00′W / 42.4°N 103.0°W / 42.4; -103.0Coordinates: 42°24′N 103°00′W / 42.4°N 103.0°W / 42.4; -103.0
Approximate paleocoordinates 43°06′N 99°06′W / 43.1°N 99.1°W / 43.1; -99.1
Region Nebraska
Country  United States

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:

Mammals
  • Aletomeryx gracilis
  • Arretotherium fricki
  • Barbouromeryx trigonocorneus
  • Cynarctoides acridens
  • Cynelos stenos
  • 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
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