Ammospermophilus fossil map
Where fossils of Ammospermophilus have been found, shown on the Earth as it looked about 15 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 15 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 | 16.3 million years ago to the present (Burdigalian to Holocene) |
| Periods | Neogene, Quaternary |
| Family | Sciuridae |
| Named by | Merriam 1892 |
| Fossil records | 44 occurrences at 15 locations (PBDB) |
| Found in | United States, Mexico |
| Rock formations | txn:41486, Juntura, Ash Hollow, MR Caliente, Fleming, Avawatz |
About Ammospermophilus
Antelope squirrels or antelope ground squirrels of the genus Ammospermophilus are sciurids found in the desert and dry scrub areas of the southwestern United States and northern Mexico. They are a type of ground squirrel and are able to resist hyperthermia and can survive body temperatures over 40 °C (104 °F).
Text in “About” is quoted from the Wikipedia article Antelope squirrel (revision 1380066821), 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: Q541036.
