Dakhla Formation
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The Dakhla Formation, also called the Dakhla Shale,[1] is a Maastrichtian-Danian geologic formation in the Western Desert, Egypt.[2][3] Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[4]
Fossil content
Color key
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Notes Uncertain or tentative taxa are in small text; |
Reptiles
Dinosaurs
| Dinosaurs reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Sauropoda | Ammonite Hill Member[5] | A left femur (Vb-646).[5] | Most similar to femurs of Brachiosaurus or Saltasaurus.[5] | ||
Turtles
| Turtles reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Arenila | A. krebsi | Ammonite Hill Member[6] | Partial skull.[6] | A bothremydid turtle. | |
| ?Cf. A. krebsi | Ammonite Hill Member[6] | Partial dorsal shell & right pelvis.[6] | A bothremydid turtle. | ||
| Bothremydidae | Undetermined large forms | Ammonite Hill Member[6] | Nuchal bone, left pleuron & partial plastron of one individual.[6] | A large bothremydid turtle, with a shell length of 70 to 80 centimeters.[6] | |
| Panchelonioidea | Gen. et. sp. indet. | Ammonite Hill Member[7] | Humerus (NVP010).[7] | A giant marine turtle. | |
| Taphrosphys | T. cf. sulcatus | Ammonite Hill Member[6] | Anterior part of dorsal shell & partial dorsal shell with partial anterior plastral lobe.[6] | A bothremydid turtle. | |
| Cf. T. sp. | Ammonite Hill Member[6] | Left first pleural.[6] | A bothremydid turtle. | ||
| ?Aff. Tasbacka | ?Aff. T. sp. | Ammonite Hill Member[6] | Left humerus.[6] | A chelonioid sea turtle. | |
| Zolhafah | Z. bella | Ammonite Hill Member[6] | Skull.[6] | A bothremydid turtle. | |
Mosasaurs
| Mosasaurs reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Globidens | G. phosphaticus | Beris Oyster Mudstone Member[8] | A single tooth crown (CUNV0011).[8] | A mosasaurine. | |
| Halisaurus | H. hebae | Beris Oyster Mudstone Member[9] | A halisaurine | ||
| Mosasaurinae | Indeterminate | Beris Oyster Mudstone Member[8] | A fragmentary small dentary with a single tooth (CUNV0012).[8] | A mosasaurine. | |
| Prognathodon | P. sp. | "Lower part" | Two tooth crowns, three cervical, nine dorsal, three caudal vertebrae, and ribs, found in association (NVP025).[1] | Most similar to P. overtoni, possibly a member of that species | |
Fish
| Fish reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Anomoeodus | A. aegypticus | Lower Beris Member[10] | A single specimen (NVP023).[10] | A pycnodont. | |
| Diastemapycnodus | D. tavernensis | Beris Member[11] | "A single vomer with partial dentition".[11] | A pycnodont. | |
| Sclerorhynchus | S. cf. leptodon[12] | Beris Member | Four fragmentary rostral denticles originally attributed to Onchopristis sp.[13] | A sawskate. | |
| Sclerorhynchoidei | Indeterminate[12] | Beris Member | An exceptionally large, Script error: No such module "convert". long rostrum originally attributed to Onchopristis sp.[13] | A sawskate. | |
Invertebrates
Bivalves
| Bivalves reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Apectoichnus | A. longissimus | Ammonite Hill Member[14] | Borings in Nypa fruits.[14] | Bivalve borings. | |
| Teredolites | T. clavatus | Ammonite Hill Member[14] | 32 moderately preserved borings (TBT02-33) & two badly preserved specimens (TBT44-45) in Nypa fruits.[14] | Bivalve borings. | |
Plants
| Plants reported from the Dakhla Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Nypa | N. burtinii | Fruits & seed casts.[15] | A mangrove palm | ||
| N. sp. | Ammonite Hill Member[14] | Fruits with bivalve borings.[14] | A mangrove palm. | ||
See also
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References
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- ↑ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517–607.
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Bibliography
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. Template:ISBN.