| Quasr el Sagha Formation | |
| Period: | Priabonian |
| Age: | Priabonian ~ |
| Type: | Geological formation |
| Prilithology: | Sandstone |
| Otherlithology: | Mudstone |
| Subunits: | Dir Abu Lifa & Temple Members |
| Underlies: | Gebel Qatrani Formation |
| Overlies: | Birket Qarun Formation |
| Location: | Fayum District |
| Coordinates: | 29.5°N 30.5°W |
| Paleocoordinates: | 24.9°N 26.5°W |
| Country: |  Egypt |
| Extent: | Wadi El Hitan |
The Qasr el Sagha Formation is a geological formation located in Egypt. The formation is part of the Wadi El Hitan World Heritage Site. The Qasr el Sagha Formation overlies the Birket Qarun Formation and is overlain by the Gebel Qatrani Formation. The sandstones and shales of the formation were deposited in a deltaic to shallow marine environment.[1] It dates to the Late Eocene (middle Priabonian,).[2]
Fossils of the early whale genus Saghacetus ("Sagha whale", originally named "Zeuglodon osiris") were first collected at Qasr al Sagha by German explorer Georg August Schweinfurth in January 1886 (a well-preserved dentary).Saghacetus is common in the middle of Qasr el Sagha, but there are few other specimens of archaeocetes whales; the only exception being the enigmatic "Prozeuglodon stromeri", named in 1828 based on specimens from 1904, but never adequately described before their destruction during the bombing of Munich in World War II.
Other fossils found in the formation include:[3]
| Afrotheres | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Presence | Stratigraphic member | Material | Notes | Images |
| Archaeosiren | A. stromeri | Westlich von Dimeh, Fayum.[4] | A skull & isolated thoracic vertebrae. | Synonym of Eosiren libyca. | ||
| Barytherium | B. cf. B. grave | Locality 25 & an unspecified locality.[5] | Dir Abu Lifa Member. | 2 teeth (DPC 2917 & 4071). | A basal proboscidean. | |
| Eosiren | E. libyca | North of Birket Qarun. | Temple Member. | Skulls & vertebrae. | A dugongid. | |
| Moeritherium | M. lyonsi | Various localities. | Dir Abu Lifa Member. | Numerous specimens. | A basal proboscidean. | |
| Pliohyracidae | Genus & species indeterminate | ½ mile east of Qasr el Sagha Temple. | Dir Abu Lifa Member. | A mandible (AMNH 13445). | A large hyrax formerly thought to be a juvenile specimen of Moeritherium gracile. | |
| Protosiren | P. sp. | Mandible. | Actually from the Gehannam Formation or Birket Qarun Formation. | |||
| Ferae | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Presence | Stratigraphic member | Material | Notes | Images |
| Apterodon | A. saghensis | Locality 25. | Dir Abu Lifa Member. | Left mandibular fragment. | A hyaenodont. | |
| A. sp. | Three localities. | Dir Abu Lifa & Temple member. | Mandibular elements & 2 humeri. | A hyaenodont. | ||
| cf. Hyaenodon | cf. H. brachycephalus | "Near Qasr el Sagha". | An eroded left mandibular corpus (AMNH 128553). | A hyaenodont. | ||
| Ungulates | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Presence | Stratigraphic member | Material | Notes | Images |
| cf. Bothriogenys | cf. B. sp. | Locality 25. | Dir Abu Lifa Member. | A weathered right distal humerus & shaft. | An anthracothere. | |
| Dorudon | D. atrox | "Feinktirnigem graugriinlichem Sandstein der Saghastufe, Fayum". | Remains of an immature individual now destroyed. | A basilosaurid whale. | ||
| Prozeuglodon | P. stromeri | "Feinktirnigem graugriinlichem Sandstein der Saghastufe, Fayum". | Remains of an immature individual now destroyed. | Junior synonym of Dorudon atrox. | ||
| Saghacetus | S. osiris | Multiple localities. | Temple Member. | Multiple specimens.[6] | A basilosaurid whale. | |
| Stromerius | S. nidensis | Blanckenhorn's interval II 5a of the Saghastufe.[7] | Temple Member. | 2 vertebral sequences (UM 100140 & BSPM 1902.XI.504-510). | A basilosaurid whale. | |
| Zeuglodon | Z. elliotsmithii | North of Birket Qarun. | An endocast. | Junior synonym of Saghacetus osiris. | ||
| Z. sensitivus | Gar-el-Gehannem. | Temple Member. | An endocast. | Junior synonym of Saghacetus osiris. | ||
| Z. zitteli | "Zeuglodonberg". | A fragmentary rostrum & 3 articulated cervical vertebrae. | Junior synonym of Saghacetus osiris. | |||
| Testudines | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Presence | Stratigraphic member | Material | Notes | Images |
| Andrewsemys | A. libyca | An almost complete & well-preserved shell.[9] | A podocnemidid. | |||
| Cordichelys | C. sp. | North of Birket Qarun. | A nearly complete cranium lacking only the premaxillae (UMMP 13994). | A podocnemidid. | ||
| Stereogenys | An almost complete & well-preserved shell. | Reassigned to Andrewsemys. | ||||
| S.(?) sp. | North of Birket Qarun. | A mostly-complete carapace & plastron (CGM 8718). | A podocnemidid. | |||