Calciavis fossil map
Where fossils of Calciavis 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 | 56–51.1 million years ago (Ypresian) |
| Periods | Paleogene |
| Family | Lithornithidae |
| Named by | Nesbitt and Clarke 2016 |
| Fossil records | 1 occurrences at 1 locations (PBDB) |
| Found in | United States |
| Rock formations | Green River |
About Calciavis
Calciavis is an extinct genus of bird from the Eocene of Wyoming. It is a lithornithid, a member of a lineage of flying palaeognaths, distantly related to modern ratites. Like many other fossils from the Green River Formation, its are exceptionally well preserved, bearing impressions of skin and feathers. Some researchers consider this taxon as a species of Lithornis (L. grandei).
Text in “About” is quoted from the Wikipedia article Calciavis (revision 1376482755), 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: Q27990781.
