The oldest fossil remains to date are of Cuvieronius species found in Lincoln County, Nevada, which date to an accurate 4.6 million years ago (Mya).
It was also found as far east as South Carolina and North Carolina in Pleistocene rocks dating to 1.81 million to 126,000 years ago.
In Florida, remains show both Cuvieronius living from 2 to 0.5 Mya.
The most recent findings of Cuvieronius in North America are in Sonora, Mexico, that date to 13,390 years BP at a Clovis culture kill site.
As well as remains found near the town of Hockley in Texas near Austin, which date to around 24,000 years BP.

According to a group of Brazilian mammalogists, many sites in South America referred to Cuvieronius actually refer to Notiomastodon, with many previous studies simply labeling fossils one or the other depending on location, with only localities definitely identified as Cuvieronius, the range now extends in the high Andes from Ecuador in the north, to Bolivia in the south, with the localities in the southern Andes in Chile and Argentina now thought to belong to Notiomastodon.
The same group maintains that all the South American specimens represent the single species C. hyodon, and that no confirmed fossils of Cuvieronius are more recent than 44,000 years ago in South America, so the species would not have been in South America at the time of human arrival.
By the end of the Pleistocene, the northern limit of the range of Cuvieronius was in Mexico and Central Texas.

Fossils of Cuvieronius have been found in the Ulloma and Tarija Formations of Bolivia, the Sabana Formation of Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Mexico, Nicaragua, Panama, United States (Florida, New Mexico, North Carolina, Oklahoma, South Carolina, Texas), and Venezuela.

An account has Cuvieronius remains being found in Ecuador with human artifacts dated around 200 to 400 AD.
The oldest fossil remains to date are of Cuvieronius species found in Lincoln County, Nevada, which date to an accurate 4.6 million years ago (Mya). It was also found as far east as South Carolina and North Carolina in Pleistocene rocks dating to 1.81 million to 126,000 years ago. In Florida, remains show both Cuvieronius living from 2 to 0.5 Mya. The most recent findings of Cuvieronius in North America are in Sonora, Mexico, that date to 13,390 years BP at a Clovis culture kill site. As well as remains found near the town of Hockley in Texas near Austin, which date to around 24,000 years BP.
According to a group of Brazilian mammalogists, many sites in South America referred to Cuvieronius actually refer to Notiomastodon, with many previous studies simply labeling fossils one or the other depending on location, with only localities definitely identified as Cuvieronius, the range now extends in the high Andes from Ecuador in the north, to Bolivia in the south, with the localities in the southern Andes in Chile and Argentina now thought to belong to Notiomastodon. The same group maintains that all the South American specimens represent the single species C. hyodon, and that no confirmed fossils of Cuvieronius are more recent than 44,000 years ago in South America, so the species would not have been in South America at the time of human arrival. By the end of the Pleistocene, the northern limit of the range of Cuvieronius was in Mexico and Central Texas.
Fossils of Cuvieronius have been found in the Ulloma and Tarija Formations of Bolivia, the Sabana Formation of Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Mexico, Nicaragua, Panama, United States (Florida, New Mexico, North Carolina, Oklahoma, South Carolina, Texas), and Venezuela.
An account has Cuvieronius remains being found in Ecuador with human artifacts dated around 200 to 400 AD.
Cuvieronius