Ojo Alamo Formation

Ojo Alamo Formation Stratigraphic range: Maastrichtian?-Danian, 66.5–64 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Geological formation
Sub-units	Naashoibito Member?
Underlies	Nacimiento Formation
Overlies	Kirtland Formation
Location
Region	San Juan Basin, New Mexico
Country	USA

The Ojo Alamo Formation is a geologic formation spanning the Mesozoic/Cenozoic boundary. Dinosaur remains are among the fossils that have been recovered from the formation, though all dinosaur remains come from the lowest part of the formation, the Naashoibito member (sometimes considered part of the Kirtland Formation, which dates to the late Maastrichtian stage of the Cretaceous period.^[1] Some researchers have claimed to find isolated non-avian dinosaur remains in younger parts of the formation dated to the Danian stage of the Paleogene period. If this is the case, it would represent the only known instance of a non-avian dinosaur population persisting after the K-Pg extinction event. However, most scientists consider these to have been stratigraphically misinterpreted or reworked from the Naashoibito member.^[2]

Paleofauna

• Alamosaurus

• Ojoceratops

• Ojoraptorsaurus^[3]

See also

• List of dinosaur-bearing rock formations

References

1. ^ Williamson, T.E. and Weil, A. (2008). "Metatherian mammals from the Naashoibito Member, Kirtland Formation, San Juan Basin, New Mexico and their biochronologic and paleobiogeographic significance. Journal of Vertebrate Paleontology, 28: 803-815.
2. ^ Sullivan, RM (2003). "No Paleocene dinosaurs in the San Juan Basin, New Mexico". Geological Society of America Abstracts with Programs 35 (5): 15. http://gsa.confex.com/gsa/2003RM/finalprogram/abstract_47695.htm. Retrieved 2007-07-02. 
3. ^ Robert M. Sullivan, Steven E. Jasinski and Mark P.A. Van Tomme (2011). "A new caenagnathid Ojoraptorsaurus boerei, n. gen., n. sp. (Dinosauria, Oviraptorosauria), from the Upper Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico". Fossil Record 3. New Mexico Museum of Natural History and Science Bulletin 53: 418–428. http://www.robertmsullivanphd.com/uploads/169._Sullivan_et_al.__Ojoraptorsaurus__COLOR.pdf. 

• Burns, Michael E. (2008). "Taxonomic utility of ankylosaur (Dinosauria, Ornithischia) osteoderms: Glyptodontopelta mimus Ford, 2000: a test case". Journal of Vertebrate Paleontology 28 (4): 1102–1109. doi:10.1671/0272-4634-28.4.1102. 

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