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Hell Creek - Pretty Butte, North Dakota, USA

Formation	Hell Creek
Member	Pretty Butte
Age:	72.1 - 66.0 Ma Late/Upper Cretaceous
Interval	Maastrichtian
Lithology	claystone, "shale", mudstone
Number of Collections	4
Number of Occurrences	40

Recorded Sample Locations

Location	Region	Stratigraphic Name
Pretty Butte	Slope County, North Dakota, USA	Hell Creek - Pretty Butte
Bergad & JWHall Slide #332-3	Morton County, North Dakota, USA	Hell Creek - Pretty Butte

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Amiidae family	5	Animalia : Chordata : Actinopterygii : Amiiformes : Amiidae	72.1 - 66 Ma Late/Upper Cretaceous
Cyclurus sp. genus	6	Animalia : Chordata : Actinopteri : Amiiformes : Amiidae : *Cyclurus*	72.1 - 66 Ma Late/Upper Cretaceous
Melvius sp. genus	6	Animalia : Chordata : Actinopteri : Amiiformes : Amiidae : *Melvius*	72.1 - 66 Ma Late/Upper Cretaceous
Lepisosteidae family	5	Animalia : Chordata : Actinopterygii : Lepisosteiformes : Lepisosteidae	72.1 - 66 Ma Late/Upper Cretaceous
Ceratopsidae family	5	Animalia : Chordata : Reptilia : Dinosauria : Ceratopsidae	72.1 - 66 Ma Late/Upper Cretaceous
Triceratops prorsus species	7	Animalia : Chordata : Reptilia : Dinosauria : Ceratopsidae : Triceratops : *Triceratops prorsus*	72.1 - 66 Ma Late/Upper Cretaceous
Hadrosauridae family	5	Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae	72.1 - 66 Ma Late/Upper Cretaceous
Piceoerpeton sp. genus	6	Animalia : Chordata : Osteichthyes : Caudata : Scapherpetontidae : *Piceoerpeton*	72.1 - 66 Ma Late/Upper Cretaceous
Urodeles family	5	Animalia : Chordata : Amphibia : Caudata : Urodeles	72.1 - 66 Ma Late/Upper Cretaceous
Champsosaurus sp. genus	6	Animalia : Chordata : Reptilia : Champsosauridae : *Champsosaurus*	72.1 - 66 Ma Late/Upper Cretaceous
Brachychampsa montana species	7	Animalia : Chordata : Reptilia : Crocodylia : Crocodylidae : Brachychampsa : *Brachychampsa montana*	72.1 - 66 Ma Late/Upper Cretaceous
Crocodylia order	4	Animalia : Chordata : Reptilia : Crocodylia	72.1 - 66 Ma Late/Upper Cretaceous
Lacertilia suborder	4.3	Animalia : Chordata : Reptilia : Squamata : Lacertilia	72.1 - 66 Ma Late/Upper Cretaceous
Testudines order	4	Animalia : Chordata : Reptilia : Testudines	72.1 - 66 Ma Late/Upper Cretaceous
Adocus sp. genus	6	Animalia : Chordata : Reptilia : Testudines : Adocidae : *Adocus*	72.1 - 66 Ma Late/Upper Cretaceous
Baenidae family	5	Animalia : Chordata : Reptilia : Testudines : Baenidae	72.1 - 66 Ma Late/Upper Cretaceous
Neurankylus sp. genus	6	Animalia : Chordata : Reptilia : Testudines : Baenidae : *Neurankylus*	72.1 - 66 Ma Late/Upper Cretaceous
Plesiobaena sp. genus	6	Animalia : Chordata : Reptilia : Testudines : Baenidae : *Plesiobaena*	72.1 - 66 Ma Late/Upper Cretaceous
Chelydridae family	5	Animalia : Chordata : Reptilia : Testudines : Chelydridae	72.1 - 66 Ma Late/Upper Cretaceous
Kinosternoidae superfamily	4.7	Animalia : Chordata : Reptilia : Testudines : Kinosternoidae	72.1 - 66 Ma Late/Upper Cretaceous
Judithemys backmani species	7	Animalia : Chordata : Reptilia : Testudines : Sinemydidae : Judithemys : *Judithemys backmani*	72.1 - 66 Ma Late/Upper Cretaceous
Basilemys sp. genus	6	Animalia : Chordata : Reptilia : Testudines : Nanhsiungchelyidae : *Basilemys*	72.1 - 66 Ma Late/Upper Cretaceous
Compsemys victa species	7	Animalia : Chordata : Reptilia : Testudines : Compsemydidae : Compsemys : *Compsemys victa*	72.1 - 66 Ma Late/Upper Cretaceous
Emarginachelys cretacea species	7	Animalia : Chordata : Reptilia : Testudines : Emarginachelys : *Emarginachelys cretacea*	72.1 - 66 Ma Late/Upper Cretaceous
Helopanoplia distincta species	7	Animalia : Chordata : Reptilia : Testudines : Trionychidae : Helopanoplia : *Helopanoplia distincta*	72.1 - 66 Ma Late/Upper Cretaceous
Trionychidae family	5	Animalia : Chordata : Reptilia : Testudines : Trionychidae	72.1 - 66 Ma Late/Upper Cretaceous
Saurischia unranked clade	99	Animalia : Chordata : Saurischia	72.1 - 66 Ma Late/Upper Cretaceous
Azolla sp. genus	6	Plantae : Tracheophyta : Polypodiopsida : Salviniales : Salviniaceae : *Azolla*	100.5 - 66 Ma Late/Upper Cretaceous

References

Bergad R. D., Hall J. W. (1971) A Cretaceous Azolla Massula with large Glochidia, The Botanical Gazette 132 3, 237-239

Holland, Jr. F. D. (1997) A North Dakota Triceratops skull, Contributions to Geology, University of Wyoming 32 1, 37-50

Holroyd P. A., Hutchison J. H. (2002) Patterns of geographic variation in latest Cretaceous vertebrates: evidence from the turtle component, Geological Society of America Special Paper 361, 177-190

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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