Youngofiber fossil map
Where fossils of Youngofiber 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 | 23.04–11.63 million years ago (Aquitanian to Serravallian) |
| Periods | Neogene |
| Family | Castoridae |
| Named by | Chow and Li 1978 |
| Fossil records | 8 occurrences at 2 locations (PBDB) |
| Found in | China |
| Rock formations | Xiacaowan, txn:41534 |
About Youngofiber
Youngofiber is an extinct genus of beavers from Miocene China and Japan.
Text in “About” is quoted from the Wikipedia article Youngofiber (revision 1343120782), 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: Q112660645.