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Moenkopi - Holbrook, Arizona, USA

Formation	Moenkopi
Member	Holbrook
Age:	247 - 242 Ma Triassic
Interval	Aegean - Bithynian
Lithology	siltstone, conglomerate, mudstone, sandstone, sandstone/conglomerate
Number of Collections	25
Number of Occurrences	66

Recorded Sample Locations

Location	Region	Stratigraphic Name
Holbrook quarry	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
MSM 02-153	Holbrook Basin, Apache County, Arizona, USA	Moenkopi - Holbrook
MSM 00-99	Navajo County, Arizona, USA	Moenkopi - Holbrook
MSM 02-145	Navajo County, Arizona, USA	Moenkopi - Holbrook
UCMP V4119	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
UCMP V4924	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
UCMP V4609	Coconino County, Arizona, USA	Moenkopi - Holbrook
5:00 Quarry and surroundings	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
MSM 02-151	Navajo County, Arizona, USA	Moenkopi - Holbrook
Radar Mesa	Coconino County, Arizona, USA	Moenkopi - Holbrook
UCMP V3956	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
UCMP V3856	Coconino County, Arizona, USA	Moenkopi - Holbrook
UCMP V4204	Coconino County, Arizona, USA	Moenkopi - Holbrook
Snowflake	Supai Salt Basin, Arizona, USA	Moenkopi - Holbrook
UCMP V4207	Coconino County, Arizona, USA	Moenkopi - Holbrook

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Plantae kingdom	1	Plantae	247.2 - 242 Ma Triassic
Calamites sp. genus	6	Plantae : Tracheophyta : Polypodiopsida : Equisetales : Calamitaceae : *Calamites*	247.2 - 242 Ma Triassic
Vertebrata subphylum	2.3	Animalia : Chordata : Vertebrata	247.2 - 242 Ma Triassic
Boreosomus sp. genus	6	Animalia : Chordata : Actinopteri : Ptycholepiformes : Ptycholepididae : *Boreosomus*	247.2 - 242 Ma Triassic
Hybodontes family	5	Animalia : Chordata : Hybodontes	247.2 - 242 Ma Triassic
Hybodus sp. genus	6	Animalia : Chordata : Chondrichthyes : Hybodontiformes : Hybodontidae : *Hybodus*	247.2 - 242 Ma Triassic
Moenkopia wellesi species	7	Animalia : Chordata : Coelacanthimorpha : Coelacanthiformes : Coelacanthidae : Moenkopia : *Moenkopia wellesi*	247.2 - 242 Ma Triassic
Cynodontia family	5	Animalia : Chordata : Cynodontia	247.2 - 242 Ma Triassic
Dicynodontia unranked clade	99	Animalia : Chordata : Osteichthyes : Cotylosauria : Dicynodontia	247.2 - 242 Ma Triassic
Therapsipus cumminsi species	7	Animalia : Chordata : Osteichthyes : Cotylosauria : Therapsipus : *Therapsipus cumminsi*	247.2 - 242 Ma Triassic
Vigilius wellesi species	7	Animalia : Chordata : Osteichthyes : Temnospondyli : Brachyopidae : Vigilius : *Vigilius wellesi*	247.2 - 242 Ma Triassic
Quasicyclotosaurus campi species	7	Animalia : Chordata : Amphibia : Quasicyclotosaurus : *Quasicyclotosaurus campi*	247.2 - 242 Ma Triassic
Rhadalognathus boweni species	7	Animalia : Chordata : Osteichthyes : Temnospondyli : Heylerosauridae : Rhadalognathus : *Rhadalognathus boweni*	247.2 - 242 Ma Triassic
Eocyclotosaurus randalli species	7	Animalia : Chordata : Osteichthyes : Temnospondyli : Eocyclotosaurus : *Eocyclotosaurus randalli*	247.2 - 242 Ma Triassic
Eocyclotosaurus wellesi species	7	Animalia : Chordata : Amphibia : Mastodonsauridae : Eocyclotosaurus : *Eocyclotosaurus wellesi*	247.2 - 242 Ma Triassic
Hadrokkosaurus bradyi species	7	Animalia : Chordata : Osteichthyes : Temnospondyli : Hadrokkosaurus : *Hadrokkosaurus bradyi*	247.2 - 242 Ma Triassic
Temnospondyli unranked clade	99	Animalia : Chordata : Osteichthyes : Temnospondyli	247.2 - 242 Ma Triassic
Stanocephalosaurus sp. genus	6	Animalia : Chordata : Amphibia : *Stanocephalosaurus*	247.2 - 242 Ma Triassic
Reptilia class	3	Animalia : Chordata : Reptilia	247.2 - 242 Ma Triassic
Chirotherium sp. genus	6	Animalia : Chordata : Reptilia : Chirotheriidae : *Chirotherium*	247.2 - 242 Ma Triassic
Chirotherium barthii species	7	Animalia : Chordata : Reptilia : Chirotheriidae : Chirotherium : *Chirotherium barthii*	247.2 - 242 Ma Triassic
Chirotherium rex species	7	Animalia : Chordata : Reptilia : Chirotheriidae : Chirotherium : *Chirotherium rex*	247.2 - 242 Ma Triassic
Isochirotherium marshalli species	7	Animalia : Chordata : Reptilia : Eosuchia : Chirotheriidae : Isochirotherium : *Isochirotherium marshalli*	247.2 - 242 Ma Triassic
Synaptichnium cameronensis species	7	Animalia : Chordata : Reptilia : Eosuchia : Chirotheriidae : Synaptichnium : *Synaptichnium cameronensis*	247.2 - 242 Ma Triassic
Arizonasaurus babbitti species	7	Animalia : Chordata : Reptilia : Thecodontia : Ctenosauriscidae : Arizonasaurus : *Arizonasaurus babbitti*	247.2 - 242 Ma Triassic
Anisodontosaurus greeri species	7	Animalia : Chordata : Reptilia : Anisodontosaurus : *Anisodontosaurus greeri*	247.2 - 242 Ma Triassic
Archosauria unranked clade	99	Animalia : Chordata : Reptilia : Eosuchia : Archosauria	247.2 - 242 Ma Triassic
Archosauromorpha unranked clade	99	Animalia : Chordata : Reptilia : Eosuchia : Archosauromorpha	247.2 - 242 Ma Triassic
Poposauroidea unranked clade	99	Animalia : Chordata : Reptilia : Eosuchia : Poposauroidea	247.2 - 242 Ma Triassic
Ammorhynchus navajoi species	7	Animalia : Chordata : Reptilia : Rhynchosauria : Rhynchosauridae : Ammorhynchus : *Ammorhynchus navajoi*	247.2 - 242 Ma Triassic
Rotodactylus bradyi species	7	Animalia : Chordata : Reptilia : Rotodactylidae : Rotodactylus : *Rotodactylus bradyi*	247.2 - 242 Ma Triassic
Rhynchosauroides sp. genus	6	Animalia : Chordata : Reptilia : Rhynchocephalia : *Rhynchosauroides*	247.2 - 242 Ma Triassic

References

Welles S. P. (1947) Vertebrates from the Upper Moenkopi Formation of northern Arizona, University of California Publications in Geological Sciences 27 7, 241-294

Peabody F. E. (1948) Reptile and amphibian trackways from the Lower Triassic Moenkopi formation of Arizona and Utah, University of California Publications, Bulletin of the Department of Geological Sciences 27 8, 295-468

Schaeffer B., Gregory J. T. (1961) Coelacanth fishes from the continental Triassic of the western United States, American Museum Novitates 2036, 1-18

Hunt A. P., Santucci V. L., et al (1993) Dicynodont trackways from the Holbrook Member of the Moenkopi Formation (Middle Triassic: Anisian), Arizona, USA, The Nonmarine Triassic, New Mexico Museum of Natural History and Science Bulletin 3, 213-218

Nesbitt S. (1999) A Middle Triassic ichnofauna: a preliminary report, Mesa Southwest Museum Bulletin 6, 23-33

Cuny G., Gauffre F.-X., et al (1999) First discovery of a cynodont from the Moenkopi Formation (Middle Triassic) of northeastern Arizona, Oryctos 2, 17-20

Schoch R., Milner A. R. (2000) Stereospondyli, Handbuch der Paläoherpetologie - Encyclopedia of Paleoherpetology 3B, 1-203

Warren A., Marsicano C. (2000) A phylogeny of the Brachyopoidea (Temnospondyli, Stereospondyli), Journal of Vertebrate Paleontology 20, 462-483

Schoch R. R. (2000) The status and osteology of two new cyclotosaurid amphibians from the Upper Moenkopi Formation of Arizona (Amphibia: Temnospondyli; Middle Triassic), Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 216 3, 387-411

Nesbitt S. J. (2000) A preliminary report on new vertebrate fossil sites, including a microsite from the Holbrook Member of the Moenkopi Formation, Holbrook, Arizona, Mesa Southwest Museum Bulletin 7, 17-30

Nesbitt S. J., Angielczyk K. D. (2002) New evidence of large dicynodonts in the upper Moenkopi Formation (Middle Triassic) of northern Arizona, PaleoBios 22 2, 10-17

Nesbitt S. J. (2003) Arizonasaurus and its implications for archosaur divergence, Proceedings of the Royal Society of London B (supplement, Biology Letters) 270, S234-S237

Nesbitt S. J., Whatley R. L. (2004) The first discovery of a rhynchosaur from the upper Moenkopi Formation (Middle Triassic) of northern Arizona, PaleoBios 24 3, 1-10

Nesbitt S. J. (2005) Osteology of the Middle Triassic pseudosuchian archosaur Arizonasaurus babbitti, Historical Biology 17, 19-47

Nesbitt S. J. (2005) A new archosaur from the upper Moenkopi Formation (Middle Triassic) of Arizona and its implications for rauisuchian phylogeny and diversification, Neues Jahrbuch für Geologie und Paläontologie Monatshefte 2005 6, 332-346

Nesbitt S. J. (2005) The Moenkopi Formation along the Little Colorado River in eastern Arizona, Guidebook to the Triassic Formations of the Colorado Plateau in northern Arizona, Mesa Southwest Museum Bulletin 9, 13-23

Klein H., Lucas S. G. (2010) Review of the tetrapod ichnofauna of the Moenkopi Formation/Group (Early-Middle Triassic) of the American Southwest, New Mexico Museum of Natural History and Science, Bulletin 50, 1-67

Schoch R. R., Nesbitt S., et al (2010) The reptile assemblage from the Moenkopi Formation (Middle Triassic) of New Mexico, Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen 255, 345-369 doi:10.1127/0077-7749/2009/0030

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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