''Mammacyon'' is an extinct genus of medium-sized amphicyonids endemic to

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

during the

Late Oligocene The Chattian is, in the geologic timescale The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the pro ...

and

Early Miocene The Early Miocene (also known as Lower Miocene) is a sub-epoch of the Miocene epoch (geology), Epoch made up of two faunal stage, stages: the Aquitanian age, Aquitanian and Burdigalian stages. The sub-epoch lasted from 23.03 ± 0.05 annum, Ma to ...

. It lived from 26.3 to 20.4 Ma, existing for approximately .''Mammacyon'' at fossilworks
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References

Amphicyonidae Miocene Amphicyonidae Oligocene caniforms Burdigalian genus extinctions Prehistoric mammals of North America Oligocene genus first appearances Prehistoric carnivoran genera {{paleo-carnivora-stub