Stegomastodon fossil map
Where fossils of Stegomastodon have been found, shown on the Earth as it looked about 5 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 5 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 9.4–0.0117 million years ago (Tortonian to Late Pleistocene) |
| Periods | Neogene, Quaternary |
| Family | Gomphotheriidae |
| Named by | Pohlig 1912 |
| Fossil records | 116 occurrences at 40 locations (PBDB) |
| Found in | United States, Mexico, Argentina, Nicaragua, Uruguay |
| Rock formations | txn:43240, Blanco, St. David, Gila Conglomerate, Rexroad, Palomas |
About Stegomastodon
Stegomastodon ('roof breast tooth') is an extinct genus of gomphotheres. It ranged throughout North America from the Pliocene (early Blancan ~3.58 Ma), to the Early Pleistocene (early Irvingtonian, ~1.07 Ma). The former South American species have been synonymized with Notiomastodon platensis.
Text in “About” is quoted from the Wikipedia article Stegomastodon (revision 1371814397), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q136453.
