Jobu Formation

Jobu Formation
Stratigraphic range: late Cenomanian ~96–94  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Mifune Group
Lithology
Primary	Mudstone
Location
Coordinates	32°42′N130°54′E / 32.7°N 130.9°E / 32.7; 130.9
Approximate paleocoordinates	44°24′N123°30′E / 44.4°N 123.5°E / 44.4; 123.5
Region	Fukui, Kumamoto
Country	Japan
Jobu Formation (Japan)

The Jobu Formation is a Cretaceous geologic formation of Late Cenomanian age. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. The oldest confirmed tyrannosaurid premaxillary tooth was recovered from the Jobu Formation. ^[1] The mammal Sorlestes is also known from the formation.

Fossil content

The following fossils were reported from the formation: ^[2]

• Mammals
  • Sorlestes mifunensis ^[3]
• Dinosaurs
  • Carnosauria indet. (= Allosaurus sp. ?) ^[4]
  • Ceratopsia indet. ^[4]
  • Tetanurae indet. ^[5]
  • Theropoda indet. ^[6]
  • Tyrannosauridae indet. ^[7]
• Pterosaurs
  • Azhdarchidae indet. ^[8]
• Turtles
  • Adocus sp. ^[9]
  • Shachemys sp. ^[9]
  • Nanhsiungchelyidae indet. ^[10]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils

References

1. Holtz, 2001
2. Jobu Formation in the Paleobiology Database
3. Setoguchi et al., 1999
4. Tamura et al., 1991
5. Carrano et al., 2012
6. Chure et al., 2011
7. Manabe, 1999
8. Ikegami et al., 2000
9. Danilov et al., 2011
10. Danilov & Syromyatnikova, 2008

Bibliography

• M. T. Carrano, R. B. J. Benson, and S. D. Sampson. 2012. The phylogeny of Tetanurae (Dinosauria: Theropoda). Journal of Systematic Palaeontology 10(2):211-300
• I. G. Danilov, V. B. Sukhanov, and E. V. Syromyatnikova. 2011. New Asiatic materials on turtles of the family Adocidae with a review of the adocid record in Asia. Proceedings of the Zoological Institute, Russian Academy of Sciences 315(2):101-132
• I. G. Danilov and E. V. Syromyatnikova. 2008. New materials on turtles of the family Nanhsiungchelyidae from the Cretaceous of Uzbekistan and Mongolia, with a review of the Nanhsiungchelyid record in Asia. Proceedings of the Zoological Institute RAS 312(1/2):3-25
• Holtz, T.R., Jr. 2001. The phylogeny and taxonomy of the Tyrannosauridae. pp. 64–83, in D.H. Tanke and K. Carpenter (eds.), Mesozoic Vertebrate Life: New Research Inspired by the Paleontology of Philip J. Currie. Indiana Univ. Press
• N. Ikegami, A. W. A. Kellner, and Y. Tomida. 2000. The presence of an azhdarchid pterosaur in the Cretaceous of Japan. Paleontological Research 3(4):165-170
• D. J. Chure, M. Manabe, M. Tanimoto and Y. Tomida. 1999. An unusual theropod tooth from the Mifune Group (Late Cenomanian to Early Turonian), Kumamoto, Japan. In Y. Tomida, T. H. Rich, and P. Vickers-Rich (eds.), Proceedings of the Second Gondwanan Dinosaur Symposium, National Science Museum Monographs 15:291-296
• M. Manabe. 1999. The early evolution of the Tyrannosauridae in Asia. Journal of Paleontology 73(6):1176-1178
• T. Setoguchi, T. Tsubamoto, H. Hanamura and K. Hachiya. 1999. An early Late Cretaceous mammal from Japan, with reconsideration of the evolution of tribosphenic molars. Paleontological Research 3(1):18-28
• M. Tamura, Y. Okazaki, and N. Ikegami. 1991. [Occurrence of carnosaurian and herbivorous dinosaurs from upper formation of Mifune Group, Japan]. Kumamoto Daigaku Kyōiku Gakubu kiyō. Shizen kagaku 40:31-45