Latitudinal range: 42.8° to 43.9°

Found in 5 samples

United States: Dead Horse (Early Oligocene), Rabbit Graveyard (Green Marker Level) (Early Oligocene), Rabbit Graveyard (Lumpy Level) (Early Oligocene), Bartlett High (Early Oligocene), Bloom Basin (BADL-LOC-0293) (Early Oligocene)

See also Ischyromys sp., Ischyromys typus