Mammoth construction of the Great Pyramid of ancient Egypt. The earliest known proboscideans, the clade that contains the elephants, existed about 55 million years ago around the Tethys Sea area. The closest relatives of the Proboscidea are the sirenians and the hyraxes. The family Elephantidae is known to have existed six million years ago in Africa, and includes the living elephants and the mammoths. Among many now extinct clades, the mastodon is only a distant relative of the mammoths, and part of the separate Mammutidae family, which diverged 25 million years before the mammoths evolved. The following cladogram shows the placement
Mastodon (album) Mastodon (album) Mastodon is the only box set released by the American heavy metal band of the same name. It features all of their material released by Relapse Records plus "Blood Mountain" which was originally released on Reprise Records. The box set was limited to 1100 copies and all records were pressed on 180 gram vinyl. The box set was released by Relapse records with no input from the band. The box set contains the following audio: <nowiki>*</nowiki> Unreleased before this box set.<br> <nowiki>**</nowiki>"Leviathan" also includes the band's cover versions of Thin Lizzy's "Emerald", Melvins "The Bit" and Metallica's "Orion".