Kirtland Formation

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Kirtland Formation
Stratigraphic range: Campanian, 74.5–73Ma
↓
Type Geological formation
Sub-units Hunter Wash Member, Farmington Member, De-na-zin Member
Underlies Ojo Alamo Formation
Overlies Fruitland Formation
Thickness 594 meters
Location
Region  New Mexico  Colorado
Country  USA

The Kirtland Formation (originally the Kirtland Shale) is a sedimentary geological formation.[1] It is the product of alluvial muds and overbank sand deposits from the many channels draining the coastal plain that existed on the inland seashore of North America, in the late Cretaceous period. It overlies the Fruitland Formation. It is found in the San Juan Basin in the states of New Mexico and Colorado, in the United States of America.

The base of the Kirtland Formation and its lowest sub-unit, the Hunter Wash member, has been dated to 74.55 ± 0.29 Ma. Together with the upper part of the underlying Fruitland Formation, this contains fossils representing the Hunter Wash local fauna. The border between the Hunter Wash member and overlying Farmington member dates to approximately 74 million years ago. The top of the Farmington member and bottom of the overlying De-na-zin member has been radiometrically dated to 73.37 ± 0.28 Ma ago. The top of the De-na-zin member, which contains the Willow Wash local fauna, has been dated to 73.04 ± 0.25 Ma ago.[1]

Overlying the De-na-zin member is a unit called the Naashoibito member This has often been considered to be part of the Kirtland formation, but more recently has been transferred back to the overlying Ojo Alamo Formation, which it had originally been part of.[1]

Vertebrate Paleofauna

Bony fish

Bony fishes of the Kirtland Formation
Genus Species Location Member Abundance Notes

Melvius[2]

M. chauliodous[2]

Member of the Willow Wash local fauna.[2]

Cartilaginous fish

Cartilaginous fishes of the Kirtland Formation
Genus Species Location Member Abundance Notes

Myledaphus[2]

M. bipartitus[2]

Member of the Willow Wash local fauna.[2]

Crurotarsans

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Crurotarsans of the Kirtland Formation
Genus Species Location Member Abundance Notes

Brachychampsa[2]

B. montana[2]

Member of the Willow Wash local fauna.[2]

Denazinosuchus[2]

D. kirtlandicus[2]

Member of the Willow Wash local fauna.[2]

Leidyosuchus[3]

Indeterminate[3]

Member of the Willow Wash local fauna.[2]

Ornithischians

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Ornithischians reported from the Kirtland Formation
Genus Species Location Member Material Notes Images

Ahshislepelta[4]

A. minor[4]
  • Hunter Wash[4]

Incomplete postcranial skeleton[4]
Kritosaurus
Parasaurolophus
Titanoceratops ouranos

Anasazisaurus[5]

A. horneri[5]

"Partial skull."[5]

Kritosaurus[6]

K. navajovius[6]

Member of the Willow Wash local fauna.[2]

Naashoibitosaurus[6]

N.ostromi[6]

"Partial skull."[7]

Member of the Willow Wash local fauna.[2]

Nodocephalosaurus[6]

N. kirtlandensis[6]

"Partial skull."[8]

Member of the Willow Wash local fauna.[2]

Parasaurolophus[6]

P. tubicen[6]

"Disarticulated, associated skull and postcraniua, pertaining to at least [three] individuals."[9]

Member of the Willow Wash local fauna.[2]

Pentaceratops[6]

P. fenestratus[6]

P. sternbergi[6]

More common in the lower part of the formation.[10]

Member of the Willow Wash local fauna.[2]

Sphaerotholus[2]

S. goodwini[2]

Member of the Willow Wash local fauna.[2]

Stegoceras[11]

S. novomexicanum[11]

"SMP VP-2790, incomplete parietal"[11]

Also found in the upper Fruitland Formation.

Titanoceratops

T. ouranos
  • Hunter Wash

Member of the Willow Wash local fauna.

Pterosaurs

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Pterosaurs of the Kirtland Formation
Genus Species Location Member Abundance Notes

Navajodactylus[12]

N. boerei[12]

Partial phalanx and ulna fragment[12]

Hunter Wash Member[12]

Saurischians

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Saurischians of the Kirtland Formation
Genus Species Location Member Abundance Notes Images

Alamosaurus[13]

A. sanjuanensis[13]

Erroneously identified as a member of the Willow Wash fauna, specimens actually from the Naashoibito member of the Ojo Alamo Formation[14]
Bistahieversor

Aublysodon[15]

A. mirandus[15]

Remains once attributed to the dubious tooth genus Aublysodon (and later Daspletosaurus)[15] are now referred to Bistahieversor, although these remains (OMNH 10131) may possibly have come from the Fruitland Formation.[16]

Bistahieversor[17]

B. sealeyi[17]

Daspletosaurus[15]

Unnamed[15]

Remains formerly referred to an unidentified or undescribed species of Daspletosaurus were originally attributed to the dubious tooth genus Aublysodon.[15] These remains were later reclassified as belonging to the new genus Bistahieversor. Some of these remains (OMNH 10131), however, may have originated in the Fruitland Formation.[16]

Ornithomimus[6]

O. sp.[6]

Member of the Willow Wash local fauna.[2]

Saurornitholestes[6]

S. langstoni[6]

Specimens once attributed to S. langstoni are now referred to S. robustus.[18]

S. robustus[18]

Member of the Willow Wash local fauna.[2]

Struthiomimus[19]

Indeterminate[19]

Troodontidae

Indeterminate[20]

Tyrannosauridae

Indeterminate[6][21]

Turtles

Turtles of the Kirtland Formation
Genus Species Location Member Abundance Notes

Basilemys[2]

B. nobilis[2]

Member of the Willow Wash local fauna.[2]

Denazinemys[2]

D. nodosa[2]

Member of the Willow Wash local fauna.[2]

Neurankylus[2]

N. baueri[2]

Member of the Willow Wash local fauna.[2]

Plastomenus[2]

P. robustus[2]

Member of the Willow Wash local fauna.[2]

Thescelus[2]

T. hemispherica[2]

Member of the Willow Wash local fauna.[2]

See also

Footnotes

  1. ↑ 1.0 1.1 1.2 Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 2.28 2.29 2.30 2.31 2.32 2.33 2.34 2.35 2.36 2.37 2.38 2.39 2.40 2.41 2.42 2.43 2.44 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 "Table 1," in Sullivan and Lucas (2006). Page 11. Note that the Willow Wash local fauna is entirely within the De-na-zin member; see "Biostratigraphy" page 8.
  3. ↑ 3.0 3.1 Listed as "cf. Leidyosuchus sp." in "Table 1," in Sullivan and Lucas (2006). Page 11. Note that the Willow Wash local fauna is entirely within the De-na-zin member; see "Biostratigraphy" page 8.
  4. ↑ 4.0 4.1 4.2 4.3 Michael E. Burns and Robert M. Sullivan (2011). "A new ankylosaurid from the Upper Cretaceous Kirtland Formation, San Juan Basin, with comments on the diversity of ankylosaurids in New Mexico". Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin 53: 169–178. 
  5. ↑ 5.0 5.1 5.2 "Table 20.1," in Weishampel, et al. (2004). Page 439.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14 6.15 "3.3 New Mexico, United States; 10. Lower Kirtland Formation," in Weishampel, et al. (2004). Page 580.
  7. ↑ "Table 20.1," in Weishampel, et al. (2004). Page 440.
  8. ↑ "Table 17.1," in Weishampel, et al. (2004). Page 365.
  9. ↑ "Table 20.1," in Weishampel, et al. (2004). Page 442.
  10. ↑ 10.0 10.1 10.2 "Kirtlandian Index Fossils," in Sullivan and Lucas (2006). Page 10.
  11. ↑ 11.0 11.1 11.2 11.3 Steven E. Jasinski and Robert M. Sullivan (2011). "Re-evaluation of pachycephalosaurids from the Fruitland-Kirtland transition (Kirtlandian, late Campanian), San Juan Basin, New Mexico, with a description of a new species of Stegoceras and a reassessment of Texascephale langstoni". Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin 53: 202–215. 
  12. ↑ 12.0 12.1 12.2 12.3 Robert M. Sullivan and Denver W. Fowler (2011). "Navajodactylus boerei, n. gen., n. sp., (Pterosauria, ?Azhdarchidae) from the Upper Cretaceous Kirtland Formation (upper Campanian) of New Mexico". Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin 53: 393–404. 
  13. ↑ 13.0 13.1 "3.3 New Mexico, United States; 10. Lower Kirtland Formation and 11. Upper Kirtland Formation," in Weishampel, et al. (2004). Pages 580-581.
  14. ↑ Jasinski, S. E., Sullivan, R. M., & Lucas, S. G. (2011). Taxonomic composition of the Alamo Wash local fauna from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member) San Juan Basin, New Mexico. Bulletin, 53, 216-271.
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 "Systematic Paleontology," in Carr and Williamson. (2010). Page 1.
  16. ↑ 16.0 16.1 16.2 16.3 "Systematic Paleontology; Referred Specimens," in Carr and Williamson. (2010). Page 1.
  17. ↑ 17.0 17.1 17.2 17.3 "Systematic Paleontology; Holotype," in Carr and Williamson. (2010). Page 1.
  18. ↑ 18.0 18.1 18.2 18.3 "Abstract," in Sullivan. (2006). Page 253.
  19. ↑ 19.0 19.1 Listed as "cf. Struthiomimus sp." in "3.3 New Mexico, United States; 10. Lower Kirtland Formation," in Weishampel, et al. (2004). Page 580.
  20. ↑ Listed as "cf. Troodon sp." in "3.3 New Mexico, United States; 11. Upper Kirtland Formation," in Weishampel, et al. (2004). Pages 580-581.
  21. ↑ Listed as "cf. Tyrannosaurus sp." in "3.3 New Mexico, United States; 11. Upper Kirtland Formation," in Weishampel, et al. (2004). Pages 580-581.

References

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