Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions years geological and biological history on central Colorado Plateau. This field guide an attempt to pull together results recent research lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, biostratigraphy these medial Mesozoic strata that document dynamic complex this region. Additionally, data provide framework by which examine...

Click to increase image sizeClick decrease size ACKNOWLEDGMENTS Thanks Museum of Western Colorado volunteers Kay Fredette and Ray Bley, who found specimen MWC 6718 in 2008 noted its uniqueness among specimens from the quarry, expeditioner Dan Libecap, 5537 2003, J. Kirkland, put us on trail 1903. Constructive reviews were provided by D. Harris two anonymous reviewers. Work at Mygatt-Moore Quarry is carried out with assistance Bureau Land Management under permit C-60150a; field work was...

A bone bed in the middle part of Javelina Formation (Maastrichtian) Texas yielded parts about 37 identifiable ceratopsid dinosaur bones, mostly appendicular and limb girdle elements belonging to one juvenile two adult individuals Torosaurus cf. utahensis. The is a lag assemblage comprising large immobile skeletons accumulated an abandoned stream channel. In general form proportions postcranial bones are similar those Pentaceratops sternbergi not as robust latus or Triceratops horridus. few...

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions years geological and biological history on central Colorado Plateau. This field guide an attempt to pull together results recent research lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, biostratigraphy these medial Mesozoic strata that document dynamic complex this region. Additionally, data provide framework by which examine...

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions years geological and biological history on central Colorado Plateau. This field guide an attempt to pull together results recent research lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, biostratigraphy these medial Mesozoic strata that document dynamic complex this region. Additionally, data provide framework by which examine...

Whereas ornithomimosaurs (ostrich-mimic dinosaurs) are well known from Asia during the Early Cretaceous, they less this time in North America. Represented by a single specimen consisting of pedal elements, new American taxon, Arkansaurus fridayi, gen. et sp. nov., consists nearly complete right foot, recovered Lower Cretaceous (Albian–Aptian) Trinity Group Arkansas. fridayi can be distinguished other based on differentiated unguals, laterally compressed third metatarsal that is ovoid...

We present a previously discovered but undescribed late Early Cretaceous vertebrate fauna from the Holly Creek Formation of Trinity Group in Arkansas. The site ancient Gulf Coast is dominated by semi-aquatic forms and preserves diverse aquatic, semi-aquatic, terrestrial fauna. Fishes include fresh- to brackish-water chondrichthyans variety actinopterygians, including semionotids, an amiid, new pycnodontiform, Anomoeodus caddoi sp. nov. Semi-aquatic taxa lissamphibians, solemydid turtle...

The Mygatt-Moore Quarry is a deposit of several thousand dinosaur bones in the Brushy Basin Member Morrison Formation western Colorado. site has been worked for more than 30 years and nearly 2400 mapped specimens have collected. This study gathered data about quarry from many sources to investigate origin deposit. appears be an attritional relatively restricted diversity dinosaurs, with few other non-dinosaurian taxa, that accumulated vernal pool overbank setting. Bone modification was...

In 2016 and 2017, the Utah Geological Survey partnered with U.S. Bureau of Land Management to conduct a paleontological inventory Morrison Formation south west Blanding, Utah, along eastern margin Bears Ears National Monument. The in this region is critical understanding Upper Jurassic stratigraphy across Colorado Plateau because it type area for Bluff Sandstone, Recapture, Westwater Canyon, Brushy Basin Members Formation, which are basis nomenclature New Mexico Arizona as well. Researchers...

We describe a microvertebrate assemblage from the J&M site, of Upper Cretaceous (Campanian-Maastrichtian) Williams Fork Formation.Breakdown fossil bearing matrix was achieved with use heated dimethyl sulfoxide.Nine recovered taxa are new to both site and Formation.The sharks Lonchidion griffisi, Chiloscyllium sp., Cantioscyllium markaguntensis first non-batoid elasmobranchs reported Formation all represented by teeth.The rays Cristomylus Psuedomyledaphus also newly most common identifiable...

The Mygatt-Moore Quarry is a deposit of several thousand dinosaur bones in the Brushy Basin Member Morrison Formation western Colorado. site has been worked for more than 30 years and nearly 2400 mapped specimens have collected. This study gathered data about quarry from many sources to investigate origin deposit. appears be an attritional relatively restricted diversity dinosaurs, with few other non-dinosaurian taxa, that accumulated vernal pool overbank setting. Bone modification was...

Dinosaur National Monument was established in 1915 to protect and preserve the globally significant paleontological resources of Carnegie Quarry. The park expanded 1938 now protects 210,844.02 acres northeastern Utah northwestern Colorado. Extensive inventory, monitoring, excavation, research work has taken place monument, mostly focusing on Late Jurassic-age Morrison Formation over past 113 years since Quarry’s discovery 1909. This helped increase not only our knowledge dinosaur fauna, but...

Heleocola piceanus , a new, relatively large metatherian from Upper Cretaceous (‘Edmontonian’) strata of the Williams Fork Formation in northwestern Colorado is described, based on recently discovered jaw fragment (MWC 9744), addition to three isolated teeth initially referred by other studies Aquiladelphis incus and Glasbius . Although sharing several morphologic characters with Lancian genus H lower molars are considerably larger than those Glasbiu s differ latter lacking buccal cingulid,...

A bone bed in the middle part of Javelina Formation (Maastrichtian) Texas yielded parts about 37 identifiable ceratopsid dinosaur bones, mostly appendicular and limb girdle elements belonging to one juvenile two adult individuals Torosaurus cf. utahensis. The is a lag assemblage comprising large immobile skeletons accumulated an abandoned stream channel. In general form proportions postcranial bones are similar those Pentaceratops sternbergi not as robust latus or Triceratops horridus. few...

Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions years geological and biological history on central Colorado Plateau. This field guide an attempt to pull together results recent research lithostratigraphy, chronostratigraphy, sequence stratigraphy, chemostratigraphy, biostratigraphy these medial Mesozoic strata that document dynamic complex this region. Additionally, data provide framework by which examine...

The Little Houston Quarry in the Black Hills of Wyoming contains most diverse vertebrate fauna Morrison Formation (Upper Jurassic) north Como Bluff and second-most entire formation, after Reed’s 9. deposit was an occasionally reactivated abandoned river channel, interbedded green mudstone laminated green-gray siltstone above a channel sandstone. dinosaur material is densely distributed disarticulated to articulated, with several associated skeletons. biota charophytes, horsetails, possible...