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10 – FOSSILS REPTILES

REPTILES (non-avian), DINOSAURS

Model of a nest of duck-billed dinosaurs, aka hadrosaur family, Maiasaura peeblesorum, found in the Two Medicine Formation of Late Cretaceous age, near Bynum, Montana, at a site named Egg Mountain, made famous by the 1983 discovery of the first well preserved dinosaur embryos in North America. Multiple nests have been found at this site, with eggs the size of ostrich eggs and skeletons varying in age from embryonic to adult. Average length of the hatchlings in this nest is 27 inches; and the length of the adult skull shown here is 31.5 inches. Display at Wyoming Dinosaur Center, Thermopolis, Wyoming, USA. Please include "Specimen courtesy of the Wyoming Dinosaur Center" along with credit to the photographer. — TAW-4152_Hadrosaur-nest_Comp_layers

Holotype of a primitive horned dinosaur, Medusaceratops lokii, from Late Cretaceous Judith River Formation in northern Montana. Maximum skull length in this specimen is 5.0 feet. This plant-eating dinosaur was approximately 20 feet long and weighed more than 2 tons. On display at Wyoming Dinosaur Center, Thermopolis, Wyoming, USA. Please include "Specimen courtesy of the Wyoming Dinosaur Center" along with credit to the photographer. — TAW-4153_Medusaceratops-skeleton_layers

Original fossil skull of an ankylosaurian dinosaur with armour-like scutes, Denversaurus schlessmani, from Hell Creek Formation, Maastrichtian, Late Cretaceous, Powder River County, Montana. This skull is 22 inches in length and is housed in the collection of the Black HIlls Institute of Geological Research, photographed with written permission for commercial educational use. Along with credit to the photographer, please include a "specimen courtesy of" credit to the Black Hills Institute of Geological Research. — TAW-3844_ankylosaurian dinosaur-skull_flat

Cast replica of "STAN," a male Tyrannosaurus rex skeleton, named after Stan Sacrison, the guy who disovered this dinosaur's remains. The bones are of Late Cretaceous age, from the Hell Creek Formation, Harding County, South Dakota, USA. This animal was 40 feet in length, stood 12 feet tall, and had a 5-foot skull with 10-inch teeth; it is also one of the most complete T-rex skeletons ever found. Cast by the Black Hills Institute of Geological Research, on display at the Rocky Mountain Dinosaur Resource Center, Woodland Park, Colorado, USA. — TAW-3856_T-rex_Stan-replica_flat

Cast replica of a therapod dinosaur egg with exposed bones of embryo, Macroelongatoolithus xixiaensis, Lower Cretaceous, Gaoguo Formation, Henan Province, Xixia Basin, China. Length of the egg is 6.25 inches. The original specimen, named "Baby Louie," is owned by the Stone Company. Cast is in museum collection of the Black HIlls Institute of Geological Research, photographed with written permission for commercial educational use. Along with credit to the photographer, please include a "specimen courtesy of" credit to the Black Hills Institute of Geological Research. — TAW-3843_dinosaur-egg-embryo_flat

Model of Nanotyrannus lancensis dinosaur head based on the holotype skull in the Cleveland Museum of Natural History; some believe this is a juvenile T-rex. This model is 33 inches long from nose to back of head. It is in the collection of the Black HIlls Institute of Geological Research, photographed with written permission for commercial educational use. Along with credit to the photographer, please include a "specimen courtesy of" credit to the Black Hills Institute of Geological Research and credit to the artist Charles McGrady. — TAW-3833_Nanotyrannus-reconstructed-face_flat

Cast replica of a Chinese tyrannosaurid skull, Alioramus alti, from Late Cretaceous deposits (69mya) in Mongolia Formation, China. Maximum length of skull is 28 inches; cast supplied by Gaston Design. Original fossil is on display at Wyoming Dinosaur Center, Thermopolis, Wyoming, USA. This cast is in the collection of the Black HIlls Institute of Geological Research, photographed with written permission for commercial educational use. Along with credit to the photographer, please include a "specimen courtesy of" credit to the Black Hills Institute of Geological Research. — TAW-3839_Alioramus-dinosaur-skull_flat

Brock Sisson, owner of Fossilogic and a leader in fossil preparation and mounting, starting to expose bones of an unprepared Allosaurus fragilis dinosaur skull in its plaster jacket. This Allosaurus skull is of Jurassic age, from the Morrison Formation, Cowley, Wyoming. Fossilogic paleo prep lab in Orem, Utah, USA. Model released. — TAW-3604_Brock-Sisson-Allosaurus

A nest of fossilized dinosaur eggs (Oolithes spheroides), possibly Segnosaur/Therizinosaur, from Nanyang County, Henan Province, China. Approximately 3 to 4 inches across, these eggs date to the early Cretaceous. Specimen courtesy of Zhouping Guo (please include specimen credits in publications). — CHN-0007_dinosaur-eggs.tif

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