Evolution timeline 

REFERENCES

Understanding proboscidean evolution: a formidable task Je-heskel Shoshani(1998)

International Commission on Stratigraphy charts(2019)

Advances in Elephant Phylogony(2004)

A proboscidean from the late Oligocene of Eritrea, a ‘‘missing link’’ between early Elephantiformes and Elephantimorpha, and biogeographic implications (2006)

The latest woolly mammoths (2002)

The evolution of elephants, by Jan van der Made (2010)