Abundance: 0.51 to 6.80% (median 1.96%)

Latitudinal range: 39.2° to 44.3°

Habitats: (9) only

Found in 9 samples

United States: Buck Spring Quarries (B-2 horizon) (Early Eocene), Elderberry Canyon Quarry (Early Eocene), Lightning Butte (Early Eocene), Someday (Early Eocene), Deadman Butte (Early Eocene), Donna's Locality (Middle Eocene), Natural Science (Middle Eocene), Fantasia (Early Eocene), Jack Creek (Early Eocene)

See also Notharctus robinsoni, Notharctus robustior, Notharctus sp., Notharctus tenebrosus, Notharctus venticolus