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Montana - Two Medicine - Lower, Montana, USA

GroupMontana
FormationTwo Medicine
MemberLower
Age:83.6 - 70.6 Ma
Late/Upper Cretaceous
IntervalCampanian
Lithologyclaystone/sandstone
Number of Collections8
Number of Occurrences13

Recorded Sample Locations

LocationRegionStratigraphic Name
Egg IslandTeton County, Montana, USAMontana - Two Medicine - Lower
Hillside Quarry DUPLICATEPondera County, Montana, USAMontana - Two Medicine - Lower
Red Rock Far Out SiteTeton County, Montana, USAMontana - Two Medicine - Lower
Piegan/Piikani bonebed Glacier County, Montana, USAMontana - Two Medicine - Lower
Cerasinops type localityTeton County, Montana, USAMontana - Two Medicine - Lower

Associated Units

Stratigraphic NameAgeLithologyOccurrence Records
Montana - Two Medicine83.5 - 70.6 Ma
Late/Upper Cretaceous
carbonate/mudstone, mudstone, "carbonate", conglomerate/sandstone, claystone, "limestone", mudstone/sandstone157

Recorded Fossils

Accepted NameHierarchyAge
Gryposaurus latidens
species
7Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae : Gryposaurus : Gryposaurus latidens85.8 - 70.6 Ma
Late/Upper Cretaceous
Hadrosauridae
family
5Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae83.6 - 72.1 Ma
Late/Upper Cretaceous
Maiasaura sp.
genus
6Animalia : Chordata : Reptilia : Dinosauria : Hadrosauridae : Maiasaura86.3 - 83.6 Ma
Late/Upper Cretaceous
Cerasinops hodgskissi
species
7Animalia : Chordata : Ornithischia : Leptoceratopsidae : Cerasinops : Cerasinops hodgskissi83.6 - 72.1 Ma
Late/Upper Cretaceous
Prenoceratops pieganensis
species
7Animalia : Chordata : Ornithischia : Leptoceratopsidae : Prenoceratops : Prenoceratops pieganensis83.6 - 72.1 Ma
Late/Upper Cretaceous
Orodromeus sp.
genus
6Animalia : Chordata : Ornithischia : Thescelosauridae : Orodromeus86.3 - 83.6 Ma
Late/Upper Cretaceous
Gekkonoidea
superfamily
4.7Animalia : Chordata : Reptilia : Squamata : Gekkonoidea86.3 - 83.6 Ma
Late/Upper Cretaceous
Saurornitholestes sp.
genus
6Animalia : Chordata : Saurischia : Avetheropoda : Dromaeosauridae : Saurornitholestes83.6 - 72.1 Ma
Late/Upper Cretaceous
Troodon sp.
genus
6Animalia : Chordata : Saurischia : Avetheropoda : Troodontidae : Troodon86.3 - 83.6 Ma
Late/Upper Cretaceous
Daspletosaurus sp.
genus
6Animalia : Chordata : Reptilia : Dinosauria : Tyrannosauridae : Daspletosaurus83.6 - 72.1 Ma
Late/Upper Cretaceous
Bivalvia
class
3Animalia : Mollusca : Bivalvia83.6 - 72.1 Ma
Late/Upper Cretaceous
Physa sp.
genus
6Animalia : Mollusca : Gastropoda : Physidae : Physa83.6 - 72.1 Ma
Late/Upper Cretaceous

References

Hirsch K. F., Quinn B. (1990) Eggs and eggshell fragments from the Upper Cretaceous Two Medicine Formation of Montana, Journal of Vertebrate Paleontology 10 4, 491-511
Horner J. R. (1992) Cranial morphology of Prosaurolophus (Ornithischia: Hadrosauridae) with descriptions of two new hadrosaurid species and an evaluation of hadrosaurid phylogenetic relationships, Museum of the Rockies Occasional Paper 2, 1-119
Varricchio D. J. (2001) Gut contents from a Cretaceous tyrannosaurid: implications for theropod dinosaur digestive tracts, Journal of Paleontology 75 2, 401-406
Chinnery B. J. (2004) Description of Prenoceratops pieganensis gen. et sp. nov. (Dinosauria: Neoceratopsia) from the Two Medicine Formation of Montana, Journal of Vertebrate Paleontology 24 3, 572-590
Chinnery B. J., Horner J. R. (2007) A new neoceratopsian dinosaur linking North American and Asian taxa, Journal of Vertebrate Paleontology 27 3, 625-641
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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