Como Bluff is a long ridge extending east-west, located between the towns of Rock River

Rock River, Wyoming

Rock River is a town in Albany County, Wyoming, in the United States. As of the 2000 census, the town population was 235.-Geography:Rock River is located at ....

 and Medicine Bow

Medicine Bow, Wyoming

Medicine Bow is a town in Carbon County, Wyoming, United States. The population was 304 at the 2010 census.-Geography:Medicine Bow is located at ....

, Wyoming

Wyoming

Wyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...

. The ridge is an anticline

Anticline

In structural geology, an anticline is a fold that is convex up and has its oldest beds at its core. The term is not to be confused with antiform, which is a purely descriptive term for any fold that is convex up. Therefore if age relationships In structural geology, an anticline is a fold that is...

, formed as a result of compressional geological folding. Three geological formations, the Sundance

Sundance Formation

The Sundance Formation is a western North American sequence of Upper Jurassic age marine shales, sandy shales, and sandstones.The Sundance Formation underlies the western North American Morrison Formation, the most fertile source of dinosaur fossils in the Americas, and is separated by a...

, the Morrison

Morrison Formation

The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone and limestone and is light grey, greenish...

, and the Cloverly

Cloverly Formation

The Cloverly Formation are Lower Cretaceous strata located in Montana and Wyoming, in the western United States. The term now includes strata that had formerly been called the Dakota Formation in central and southern Wyoming.-Members:...

 Formations, containing fossil

Fossil

Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

 remains from the Late Jurassic of the Mesozoic Era are exposed. Nineteenth century paleontologists discovered many well-preserved specimens of dinosaurs, as well as mammals, turtles, crocodilians, and fish from the Morrison Formation. Because of this, Como Bluff is considered to be one of the major sites for the early discovery of dinosaur

Dinosaur

Dinosaurs are a diverse group of animals of the clade and superorder Dinosauria. They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period until the end of the Cretaceous , when the Cretaceous–Paleogene extinction event led to the extinction of...

 remains. Among the species discovered is the only known specimen of Coelurus

Coelurus

Coelurus is a genus of coelurosaur dinosaur from the Late Jurassic period . The name means "hollow tail", referring to its hollow tail vertebrae...

. Significant discoveries were made in 22 different areas scattered along the entire length of the ridge. It is included on the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

 as well as the National Natural Landmark

National Natural Landmark

The National Natural Landmark program recognizes and encourages the conservation of outstanding examples of the natural history of the United States. It is the only natural areas program of national scope that identifies and recognizes the best examples of biological and geological features in...

 list.

History of discovery

The discovery of dinosaurs at Como Bluff has been recounted numerous times, most notably by Schuchert and LeVene, Shur, Ostrom

John Ostrom

John H. Ostrom was an American paleontologist who revolutionized modern understanding of dinosaurs in the 1960s, when he demonstrated that dinosaurs are more like big non-flying birds than they are like lizards , an idea first proposed by Thomas Henry Huxley in the 1860s, but which had garnered...

 and McIntosh, and Jaffe. Most of the specimens were collected by men working for O.C. Marsh between 1877-1889, although some were collected by the Hubbel brothers for E.D. Cope between 1879-1880. The American Museum of Natural History excavated in 1897http://paleo.amnh.org/reports/1897.html-1898http://paleo.amnh.org/reports/1898.html, finding two partial skeletons of sauropods. A summary of the quarries and their contents is given below.

In later years, the American Museum of Natural History

American Museum of Natural History

The American Museum of Natural History , located on the Upper West Side of Manhattan in New York City, United States, is one of the largest and most celebrated museums in the world...

 and Yale University

Yale University

Yale University is a private, Ivy League university located in New Haven, Connecticut, United States. Founded in 1701 in the Colony of Connecticut, the university is the third-oldest institution of higher education in the United States...

 jointly reopened Quarry 9, the Mammal Quarry, 1968-1970, finding only a few specimens. More recently, Robert Bakker has done some collecting there with a variety of groups.

Como Bluff historical quarries (pre-1900)

Data source:.

.
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(h)= holotype

Holotype

A holotype is a single physical example of an organism, known to have been used when the species was formally described. It is either the single such physical example or one of several such, but explicitly designated as the holotype...

AMNH Quarry 1 Dinosaur Dinosaur Dinosaurs are a diverse group of animals of the clade and superorder Dinosauria. They were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period until the end of the Cretaceous , when the Cretaceous–Paleogene extinction event led to the extinction of... ia Saurischia Saurischia Saurischia meaning 'lizard' and ischion meaning 'hip joint') is one of the two orders, or basic divisions, of dinosaurs. In 1888, Harry Seeley classified dinosaurs into two orders, based on their hip structure... Sauropoda Sauropoda Sauropoda , or the sauropods , are an infraorder of saurischian dinosaurs. They had long necks, long tails, small heads , and thick, pillar-like legs. They are notable for the enormous sizes attained by some species, and the group includes the largest animals to have ever lived on land... Diplodocus Diplodocus Diplodocus , or )is a genus of diplodocid sauropod dinosaur whose fossils were first discovered in 1877 by S. W. Williston. The generic name, coined by Othniel Charles Marsh in 1878, is a Neo-Latin term derived from Greek "double" and "beam", in reference to its double-beamed chevron bones... sp AMNH Quarry 2 Dinosauria Saurischia Sauropoda Apatosaurus excelsus Apatosaurus Apatosaurus , also known by the popular but scientifically deprecated synonym Brontosaurus, is a genus of sauropod dinosaur that lived from about 154 to 150 million years ago, during the Jurassic Period . It was one of the largest land animals that ever existed, with an average length of and a... Camarasaurus Camarasaurus Camarasaurus meaning 'chambered lizard', referring to the hollow chambers in its vertebrae was a genus of quadrupedal, herbivorous dinosaurs. It was the most common of the giant sauropods to be found in North America... sp, AMNH localities unknown (some could be from Quarry 1 or 2) Reptilia Testudines Amphichelydia Glyptops plicatus Glyptops Glyptops is an extinct genus of cryptodire turtle dating from the Late Jurassic and Early Cretaceous periods 155 to 99 m.y.a. Fossils have been found in South Dakota, Wyoming, Colorado, Utah, New Mexico, Oklahoma, and Texas from both the Morrison and Cedar Mountain formations. The type species is G... Squamata Squamata Squamata, or the scaled reptiles, is the largest recent order of reptiles, including lizards and snakes. Members of the order are distinguished by their skins, which bear horny scales or shields. They also possess movable quadrate bones, making it possible to move the upper jaw relative to the... ?Sauria Sauria Sauria is a clade of reptiles that includes all living diapsids, as well as their common ancestor and all its extinct descendants. The ancestral saurian was probably a small lizard-like creature living in the Permian Period...  indeterminant Lacertilia Paramacellodus Paramacellodus Paramacellodus was a genus of prehistoric lizard of the Late Jurrasic Morrison Formation of Western North America.Present in stratigraphic zones 4 and 5.... sp. Choristodera Choristodera Choristodera is an order of semi-aquatic diapsid reptiles which ranged from the Middle Jurassic, or possibly Late Triassic, to at least the early Miocene. Choristoderes have been found in North America, Asia, and Europe. The most common fossils are typically found from the Late Cretaceous to the... Cteniogenys antiquus Cteniogenys Cteniogenys is a genus of choristodere, a morphologically diverse group of aquatic reptiles. It had a wide distribution temporally and geographically, from the Middle Jurassic and Late Jurassic of western Europe, to the Late Jurassic-age Morrison Formation of western North America, to the Late... Crocodilia Crocodilia Crocodilia is an order of large reptiles that appeared about 84 million years ago in the late Cretaceous Period . They are the closest living relatives of birds, as the two groups are the only known survivors of the Archosauria... Mesosuchia Mesosuchia "Mesosuchia" is an obsolete name for a group of terrestrial, semi-aquatic, or fully aquatic crocodylomorph reptiles. The marine crocodile Metriorhynchus had paddle-like forelimbs, Dakosaurus andiniensis had a skull that was adapted to eat large sea reptiles, and Shamosuchus was adapted for eating... Goniopholis Goniopholis Goniopholis is an extinct genus of crocodyliform that lived in North America, Europe and Asia during the Late Jurassic and Early Cretaceous. Being semi-aquatic it is very similar to modern crocodiles... sp. [Fredrick] Brown’s Quarry A Dinosauria Ornithischia Ornithischia Ornithischia or Predentata is an extinct order of beaked, herbivorous dinosaurs. The name ornithischia is derived from the Greek ornitheos meaning 'of a bird' and ischion meaning 'hip joint'... Stegosauria Stegosauria Known colloquially as stegosaurs, the Stegosauria are a group of herbivorous dinosaurs of the Jurassic and Early Cretaceous Periods, being found mostly in the Northern Hemisphere, predominantly in what is now North America and China.... Stegosaurus Stegosaurus Stegosaurus is a genus of armored stegosaurid dinosaur. They lived during the Late Jurassic period , some 155 to 150 million years ago in what is now western North America. In 2006, a specimen of Stegosaurus was announced from Portugal, showing that they were present in Europe as well... sp. Brown’s Quarry B Dinosauria Ornithischia Stegosauria Stegosaurus sp. Brown’s Quarry C Dinosauria Saurischia Theropoda Theropoda Theropoda is both a suborder of bipedal saurischian dinosaurs, and a clade consisting of that suborder and its descendants . Dinosaurs belonging to the suborder theropoda were primarily carnivorous, although a number of theropod groups evolved herbivory, omnivory, and insectivory... Allosaurus fragilis Allosaurus Allosaurus is a genus of large theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period . The name Allosaurus means "different lizard". It is derived from the Greek /allos and /sauros... Brown’s Quarry D Dinosauria Saurischia Theropoda Allosaurus fragilis Brown’s Quarry G Dinosauria Saurischia Sauropoda Camarasaurus sp. [Authur] Lakes Quarry 1A (Big Canyon Quarry) Dinosauria Saurischia Theropoda Allosaurus sp. Sauropoda Camarasaurus sp. Ornithischia Ornithopoda Camptosaurus amplus (h) (now Allosaurus Allosaurus Allosaurus is a genus of large theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period . The name Allosaurus means "different lizard". It is derived from the Greek /allos and /sauros... sp.) [E.D.] Cope's Quarry 3 Dinosauria Saurischia Theropoda Allosaurus sp. Cope's Quarry 4 Dinosauria Saurischia Theropoda Allosaurus sp. Ornithischia Stegosauria Stegosaurus sp. Cope's Quarry 5 Reptilia Pterosauria Dermodactylus montanus Dermodactylus Dermodactylus was a genus of pterodactyloid pterosaur from the Kimmeridgian-Tithonian-age Upper Jurassic Morrison Formation of Wyoming, USA... Dinosauria Saurischia Sauropoda Apatosaurus Apatosaurus Apatosaurus , also known by the popular but scientifically deprecated synonym Brontosaurus, is a genus of sauropod dinosaur that lived from about 154 to 150 million years ago, during the Jurassic Period . It was one of the largest land animals that ever existed, with an average length of and a... sp. Cope's localities unknown (could be from Quarry 1, 2) Reptilia Testudines Amphichelydia Dinochelys Dinochelys Dinochelys is an extinct genus of paracryptodiran turtle from the Late Jurassic Morrison Formation.... sp. Glyptops plicatus Crocodilia Mesosuchia Goniopholis sp. Dinosauria Ornithischia Ornithopoda ?Camptosaurus Camptosaurus Camptosaurus is a genus of plant-eating, beaked ornithischian dinosaurs of the Late Jurassic period of western North America. The name means 'flexible lizard', .... sp. Stegosauria Stegosaurus sp. Mammalia genus and species indeterminant [Harlow] Reed’s Quarry 1 Dinosauria Saurischia Theropoda Allosaurus atrox (h) (now Allosaurus fragilis) Sauropoda Camarasaurus grandis Camarasaurus Camarasaurus meaning 'chambered lizard', referring to the hollow chambers in its vertebrae was a genus of quadrupedal, herbivorous dinosaurs. It was the most common of the giant sauropods to be found in North America... (h) Camarasaurus impar (h) (now Camarasaurus grandis) Camarasaurus robustus (h) (now Camarasaurus grandis) Pleurocoelus montanus (h) (now Camarasaurus grandis) Diplodocus sp. Mammalia genus and species indeterminant Reed’s Quarry 1 ½ Dinosauria Saurischia Theropoda Allosaurus fragilis Sauropoda genus and species indeterminant Reed’s Quarry 2 Dinosauria Saurischia Sauropoda Apatosaurus sp. Reed’s Quarry 3 Dinosauria Saurischia Theropoda Allosaurus lucaris (h) (now Allosaurus sp.) Sauropoda Camarasaurus grandis Ornithischia Ornithopoda Dryosaurus Dryosaurus Dryosaurus is a genus of an ornithopod dinosaur that lived in the Late Jurassic period. It was an iguanodont . Fossils have been found in the western United States, and were first discovered in the late 19th century... sp. Stegosauria Stegosaurus sp. Reed’s Quarry 4 Dinosauria Saurischia Theropoda Allosaurus fragilis Sauropoda Apatosaurus sp. Barosaurus sp. Camarasaurus sp. Ornithischia Stegosauria Stegosaurus sp. Reed’s Quarry 5 Reptilia Pterosauria Dermodactylus montanus (h) (now nomen dubium Nomen dubium In zoological nomenclature, a nomen dubium is a scientific name that is of unknown or doubtful application... ) Dinosauria Saurischia Sauropoda Diplodocus sp. Ornithischia Ornithopoda Dryosaurus altus (h) Reed’s Quarry 6 Reptilia Crocodylia Mesosuchia Goniopholis sp. Reed’s Quarry 7 Dinosauria (Three Trees Quarry) Ornithischia Ornithopoda Laosaurus consors Laosaurus Laosaurus is a genus of hypsilophodont dinosaur. The type species is Laosaurus celer, first described by O.C. Marsh in 1878 from remains from the Oxfordian-Tithonian-age Upper Jurassic Morrison Formation of Wyoming. The validity of this genus is doubtful because it is based on fragmentary fossils... (h) (now Othnielosaurus consors Othnielosaurus Othnielosaurus is a genus of ornithischian dinosaur that lived about 155 to 148 million years ago, during the Late Jurassic-age Morrison Formation of the western United States. It is named in honor of famed paleontologist Othniel Charles Marsh, and was formerly assigned to the genus... ) Reed’s Quarry 8 Reptilia Testudines genus and species indeterminant Crocodilia Mesosuchia Goniopholis sp. Dinosauria Saurischia Theropoda Allosaurus sp. Coelurus fragilis Coelurus Coelurus is a genus of coelurosaur dinosaur from the Late Jurassic period . The name means "hollow tail", referring to its hollow tail vertebrae... Sauropoda Camarasaurus sp. Diplodocus sp. Ornithischia Stegosauria Stegosaurus sp.

Reed’s Quarry 9 (Mammal Quarry) Osteichthyes Osteichthyes Osteichthyes , also called bony fish, are a taxonomic group of fish that have bony, as opposed to cartilaginous, skeletons. The vast majority of fish are osteichthyes, which is an extremely diverse and abundant group consisting of over 29,000 species... Actinopterygii Actinopterygii The Actinopterygii or ray-finned fishes constitute a class or sub-class of the bony fishes.The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines , as opposed to the fleshy, lobed fins that characterize... genus and species indeterminant Amiiformes Amiiformes Amiiformes is an order of fish, of which only one species, the Bowfin, Amia calva, is still extant.-Taxonomy:Amiiformes Hay 1929*Superfamily Amioidea Bonaparte 1838**Family Amiidae Bonaparte 1837***Subfamily Amiinae Bonaparte 1837... Ophiopsis Ophiopsis Ophiopsis is an extinct genus of prehistoric bony fish.-See also:* Prehistoric fish* List of prehistoric bony fish... sp. Sarcopterygii Sarcopterygii The Sarcopterygii or lobe-finned fishes – sometimes considered synonymous with Crossopterygii constitute a clade of the bony fishes, though a strict classification would include the terrestrial vertebrates... Dipnoi Ceratodus guentheri Ceratodus Ceratodus was a wide-ranging genus of extinct sarcopterygiian lungfish. Fossil evidence dates back to the Middle Triassic 228 million years ago. A wide range of fossil species from different time periods have been found around the world in places such as the United States, Argentina, England,... Amphibia Anura Comobatrachus aenigmatis Comobatrachus Comobatrachus is a dubious genus of prehistoric frog erected by O. C. Marsh to house fragmentary remains recovered from Reed's Quarry 9 near Como Bluff Wyoming. Along with Eobatrachus it was among the earliest frog remains from the formation, although the two dubious genera were erected decades... Discoglossoidea Enneabatrachus hechti Enneabatrachus Enneabatrachus hechti is an extinct species of an extinct genus of prehistoric frog known from the late Jurassic Morrison Formation. Its remains have been recovered from stratigraphic zone 5. One specimen has been recovered from Quarry 9 of Como Bluff in Wyoming and another specimen was later... Pelobatidae Pelobatidae The European spadefoot toads are a family of frogs, the Pelobatidae, with only one extant genus Pelobates, containing four species. They are native to Europe, the Mediterranean, northwestern Africa and western Asia....  indeterminant Pipoidea Pipoidea Pipoids are a superfamily of frogs.... ? Eobatrachus agilis Eobatrachus Eobatrachus is a dubious genus of prehistoric frog erected by O. C. Marsh to house fragmentary remains recovered from Reed's Quarry 9 near Como Bluff Wyoming. Along with Comobatrachus it was among the earliest frog remains from the formation, although the two dubious genera were erected decades... (h) Caudata genus and species indeterminant Comonecturoides marshi Comonecturoides Comonecturoides is an extinct genus of prehistoric amphibian.-See also:* Prehistoric amphibian* List of prehistoric amphibians... (h) Reptilia Testudines Amphichelydia Dinochelys whitei Dinochelys Dinochelys is an extinct genus of paracryptodiran turtle from the Late Jurassic Morrison Formation.... Glyptops ornatus Squamata ?Sauria indeterminant Lacertilia Dorsetisaurus Dorsetisaurus Dorsetisaurus was a genus of prehistoric lizard of the Late Jurrasic Morrison Formation of Western North America.Present in stratigraphic zones 2, 4, and 5.... sp. Paramacellodus Paramacellodus Paramacellodus was a genus of prehistoric lizard of the Late Jurrasic Morrison Formation of Western North America.Present in stratigraphic zones 4 and 5.... sp. Rhynchocephalia Opisthias rarus Opisthias Opisthias is a Late Jurassic genus of sphenodont reptile from the Morrison Formation of western North America, present in stratigraphic zones 2 and 4-6.-See also:* Prehistoric reptile* Paleobiota of the Morrison Formation... (h) Theretairus antiquus Theretairus Theretairus is a Late Jurassic genus of sphenodont reptile from the Morrison Formation of western North America, present in stratigraphic zones 5 and 6.-See also:* Prehistoric reptile* Paleobiota of the Morrison Formation... (h) Choristodera Cteniogenys antiquus (h) Crocodylia Sphenosuchia Sphenosuchia Sphenosuchia is a suborder of basal crocodylomorphs that first appeared in the Triassic and occurred into the Late Jurassic. Most were small, gracile animals with an erect limb posture. They are now thought to be ancestral to crocodyliforms, which include all living crocodilians.-Stratigraphic... Macelognathus vagans Macelognathus Macelognathus is an extinct genus of sphenosuchian crocodile from the Late Jurassic. Originally it was believed be a theropod dinosaur. It lived in what is now Wyoming, in North America.... (h) Mesosuchia Goniopholis sp. Dinosauria Saurischia Theropoda Allosaurus fragilis Ceratosaurus nasicornis Ceratosaurus Ceratosaurus meaning "horned lizard", in reference to the horn on its nose , was a large predatory theropod dinosaur from the Late Jurassic Period , found in the Morrison Formation of North America, in Tanzania and Portugal... Coelurus fragilis Ornitholestes hermanni Ornitholestes Ornitholestes was a small theropod dinosaur of the late Jurassic of Western Laurasia . To date, it is known only from a single partial skeleton, and badly crushed skull found at the Bone Cabin Quarry near Medicine Bow, Wyoming, in 1900... ? Tyrannosauroidea Tyrannosauroidea Tyrannosauroidea is a superfamily of coelurosaurian theropod dinosaurs that includes the family Tyrannosauridae as well as more basal relatives. Tyrannosauroids lived on the Laurasian supercontinent beginning in the Jurassic Period... Stokesosaurus clevelandi Stokesosaurus Stokesosaurus is a genus of small , early tyrannosaur from the Late Jurassic period of Utah and England. It was named after Utah geologist William Lee Stokes... ? Sauropoda Macronaria Macronaria Macronaria is a clade of sauropod dinosaurs from the Middle Jurassic to Late Cretaceous Periods of what are now North America, South America, Europe, Asia and Africa. The name means 'large nostrils' , in reference to the large nasal openings high on the head that probably supported fleshy...  indeterminant Diplodocidae indeterminant Ornithischia Ornithopoda Othnielosaurus consors Dryosaurus sp. Camptosaurus sp. Stegosauria Stegosaurus sp. Pterosauria Rhamphorhynchoidea Rhamphorhynchoidea The Rhamphorhynchoidea forms one of the two suborders of pterosaurs and represent an evolutionary grade of primitive members of this group of flying reptiles. This suborder is paraphyletic in relation to the Pterodactyloidea, which arose from within the Rhamphorhynchoidea, not from a more distant... Laopteryx priscus Laopteryx Laopteryx is the name assigned to a pterosaur from the Upper Jurassic Morrison Formation of Wyoming, USA; it was originally thought to be a bird.... (h) (now nomen dubium) Mammalia Docodonta Docodonta Docodonta is an order of extinct proto-mammals that lived during the mid- to late-Mesozoic era. Their most distinguishing physical features were their relatively sophisticated set of molars, from which the order gets its name. In the fossil record, Docodonta is represented primarily by isolated... Docodontidae Docodontidae Docodontidae is an extinct family of omnivorous mammals that lived during the Middle Jurassic to Upper Jurassic. Their remains have been found inEurope, Asia and North America.The mesiolingual part of lower molars regularly have wear.-External links:... Docodon affinis Docodon Docodon was an omnivorous mammal from the middle to upper Jurassic Period that lived in Europe and North America approximately 175.6 to 144 million years ago. Docodon likely inhabited woodland and stayed in trees out of the reach of predators... (h) Docodon crassus (h) Docodon striatus (h) Docodon superus (h) Docodon victor (h) Multituberculata Multituberculata The Multituberculata were a group of rodent-like mammals that existed for approximately one hundred and twenty million years—the longest fossil history of any mammal lineage—but were eventually outcompeted by rodents, becoming extinct during the early Oligocene. At least 200 species are... Allodontidae Allodontidae Allodontidae is a family of extinct mammal that lived in what is now North America during the Upper Jurassic period. Allodontids were members of the order Multituberculata. They were relatively early mammals and are within the informal suborder of "Plagiaulacida". The family was named by Othniel... Ctenacodon laticeps Ctenacodon Ctenacodon is a genus of extinct mammal that lived in what is now North America during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata. Ctenacodon,also known as Allodon , was named by Othniel Charles Marsh in 1879. At least four species are... (h) Ctenacodon scindens (h) Ctenacodon serratus (h) Psalodon fortis Psalodon Psalodon is an extinct genus of North American mammal that lived during the Upper Jurassic period. It's a member of the family Allodontidae within the order Multituberculata. The genus Psalodon was named by Simpson in 1926. There are perhaps three species... (h) Psalodon potens (h) ?Psalodon marshi (h) Triconodonta Triconodonta Triconodonta is the generic name for a group of early mammals which were close relatives of the ancestors of all present-day mammals. Triconodonts lived between the Triassic and the Cretaceous. They are one of the groups that can be classified as mammals by any definition... Amphilestidae Amphilestidae Amphilestidae is a family of Late Jurassic mammals from England.... Aploconodon comoensis Aploconodon Aploconodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Comodon gidleyi Comodon Comodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Triconodontidae Triconodontidae Triconodontidae is an extinct family of actively mobile mammal, endemic to what would be North America, Europe, and Africa during the Jurassic through Cretaceous periods from 155.7—70.6 mya, existing for approximately .-Taxonomy:... Priacodon ferox Priacodon Priacodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zones 4–6.-See also:* Prehistoric amphibian** List of prehistoric amphibians* Paleobiota of the Morrison Formation-References:... (h) Priacodon grandaevus (h) Priacodon lulli (h) Priacodon robustus (h) Trioracodon bisulcus Trioracodon Trioracodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Symmetrodonta Symmetrodonta Symmetrodonta is a basal group of Mesozoic mammals characterized by the triangular aspect of the molars when viewed from above and the absence of a well-developed talonid. The traditional group of symmetrodonts ranges in age from the latest Triassic to the Late Cretaceous. One species,... Amphidontidae Amphidontidae The Amphidontidae are a family of extinct mammals from the Early Creataceous, belonging to the triconodonts. It contains most of the species previously belonged to Amphilestidae.- Phylogeny :... Amphidon superstes Amphidon Amphidon is an extinct genus of Late Jurassic mammal from the Morrison Formation. It is present in stratigraphic zone 5. The only species in the genus is Amphidon aequicrurius, found by Simpson in 1925.-See also:* Prehistoric mammal... (h) Tinodontidae Tinodontidae Tinodontidae is an extinct family of actively mobile mammal, endemic to what would now be North America, Asia, Europe, and Africa during the Jurassic and Cretaceous periods.-Taxonomy:Tinodontidae... Tinodon bellus Tinodon Tinodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Eurylambda aequicrurius Dryolestida Dryolestida Dryolestida is an extinct order of mammals known from the Jurassic to Tertiary. It has been suggested that these mammals are either the possible ancestors of therian mammals or an offshoot from the same evolutionary line. It is also believed that they developed a fully mammalian jaw and also had... Dryolestidae Dryolestidae Dryolestidae was an abundant and diverse group of Mesozoic mammals. These mammals were different from their relatives by having the following two characteristics:*Their upper and lower molars were shortened mesiodistally and widened labiolingually.... Amblotherium gracilis Amblotherium Amblotherium is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zones 2, 3, and 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Dryolestes priscus Dryolestes Dryolestes is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zones 2, 5, and 6.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... Dryolestes obtusus (h) Dryolestes vorax (h) Laolestes eminens Laolestes Laolestes is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zones 5 and 6.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Laolestes (Melanodon) goodrichi (h) Laolestes (Melanodon) oweni (h) Miccylotyrans minimus (h) Paurodontidae Paurodontidae Paurodontidae is a family of Late Jurassic to Early Cretaceous mammals in the order Dryolestida. Remains of paurodontids have been found in the USA, Britain, Portugal, and Tanzania.... Araeodon intermissus Araeodon Araeodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation... (h) Archaeotrigon brevimaxillus Archaeotrigon Archaeotrigon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation... (h) Archaeotrigon distagmus (h) Comotherium richi Comotherium Comotherium is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation... (h) Euthlastus cordiformis Euthlastus Euthlastus is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zones 5 and 6. It is represented by only five upper molars.-See also:* Prehistoric mammal... (h) Paurodon valens Paurodon Paurodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation-References:... (h) Tathiodon agilis Tathiodon Tathiodon is an extinct genus of Late Jurassic mammal from the Morrison Formation.Present in stratigraphic zone 5.-See also:* Prehistoric mammal** List of prehistoric mammals* Paleobiota of the Morrison Formation... (h) Reed’s Quarry 10 Dinosauria Saurischia Sauropoda Apatosaurus excelsus (h) Reed’s Quarry 11 Dinosauria Saurischia Sauropoda Apatosaurus amplus (h) (now Apatosaurus excelsus) Ornithischia Stegosauria Stegosaurus duplex (h) (now Stegosaurus ungulatus) Mammalia genus and species indeterminant Reed’s Quarry 12 (Robbers' Roost Quarry) Reptilia Testudines genus and species indeterminant Crocodylia Mesosuchia Goniopholis sp. Dinosauria Saurischia Theropoda Allosaurus sp. Coelurus sp. Sauropoda Camarasaurus sp. Diplodocus sp. Ornithischia ornithopoda genus and species indeterminant Stegosauria Stegosaurus ungulatus (h) Reed’s Quarry 13 Reptilia Testudines Amphichelydia Glyptops plicatulus Crocodylia Mesosuchia Goniopholis sp. Dinosauria Saurischia Theropoda Coelurus agilis (h) (part of Coelurus fragilis holotype) Coelurus fragilis (h) Saurischia Sauropoda ?Brachiosaurus Brachiosaurus Brachiosaurus is a genus of sauropod dinosaur from the Jurassic Morrison Formation of North America. It was first described by Elmer S. Riggs in 1903 from fossils found in the Grand River Canyon of western Colorado, in the United States. Riggs named the dinosaur Brachiosaurus altithorax,... sp. Camarasaurus lentus (h) Diplodocus sp. Ornithischia Ornithopoda Camptonotus dispar (h) (now Camptosaurus dispar) Camptosaurus medius (h) Camptosaurus nanus (h) Camptosaurus browni (h) Dryosaurus sp. Stegosauria Diracodon laticeps (h) (now Stegosaurus sp.) Stegosaurus sulcatus (h) Stegosaurus stenops Stegosaurus ungulatus Reed Quarry 14 Dinosauria Saurischia Theropoda Allosaurus ferox (h) (now Allosaurus fragilis)

External links

• Como Bluff at the Wyoming State Historic Preservation Office