Eostrix fossil map
Where fossils of Eostrix have been found, shown on the Earth as it looked about 56 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 56 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 | Prehistoric birds |
|---|---|
| Lived | 56–48.07 million years ago (Ypresian) |
| Periods | Paleogene |
| Family | Protostrigidae |
| Named by | Brodkorb 1971 |
| Fossil records | 3 occurrences at 3 locations (PBDB) |
| Found in | United States, Mongolia |
| Rock formations | Wind River, Naran Bulak, Nanjemoy |
About Eostrix
Eostrix is a genus of extinct primitive owls in the family Protostrigidae, along with Oligostrix and Minerva. These owls date from the early Eocene of the United States, Europe, and Mongolia. They have been described based on fossil remains. The genus was created by Pierce Brodkorb in 1971 to place a fossil species known until that time as Protostrix mimica.
The following species are recognised:
E. mimica described in 1938 by Alexander Wetmore using hindlimb elements in Eocene strata in Wyoming.
Text in “About” is quoted from the Wikipedia article Eostrix (revision 1379257133), 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: Q5381954.
