Diabloceratops Paleontologists Discovered Diabloceratops Eatoni Centrosaurines Have Short Faces and in 2002 in Grand Staircase–Escalante National Short Frills

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Diabloceratops Paleontologists Discovered Diabloceratops Eatoni Centrosaurines Have Short Faces and in 2002 in Grand Staircase–Escalante National Short Frills

Rise of the Giants Diabloceratops Paleontologists discovered Diabloceratops eatoni Centrosaurines have short faces and in 2002 in Grand Staircase–Escalante National short frills. All early true ceratopsids eatoni appear to be centrosaurines. Take a Monument and excavated the skull between 2003 Order Ornithischia close look at the Diabloceratops skull and 2005. before you. Its short face and short, Suborder Ceratopsia ornamented frill place it squarely in the Family Ceratopsidae n the warm, lush Laramidian landscape both Utah and Canada, suggesting that centrosaurine group. The second sub- Sub-family Centrosaurinae of Utah almost 81 million years early on, similar centrosaurines ranged group, chasmosaurines, sport long Size 12–15 ft (3.7–4.6m), 1–2 tons Iago, Diabloceratops was a dominant widely. Their large heads, complex dental frills and long faces. herbivore (plant-eater), a niche similar arangements, and highly ornamented Size comparison large horse or Take a close look at the skulls to the right to that of the present-day rhinoceros. skulls (fig. d) are traits shared with all small rhinoceros of Diabloceratops. Are they centrosaurines, Scientists have found the fossilized true ceratopsid dinosaurs. Scientists Diet plants or chasmosaurines? remains of Diabloceratops-like animals in identify two main sub-groups within the Age Late Cretaceous, 81 million years ago ceratopsid family. Distribution of Fossil Wahweap Formation, At 80.5 million years old, the Monument’s Grand Staircase–Escalante National Monument Diabloceratops eatoni is the oldest Cool Fact true ceratopsid yet named. • Diabloceratops (“dee-OB-loh- ser-uh-tops”) means “devil horned face.” It was the first new horned dinosaur named from the Monument (early 2010). The species name “eatoni” honors paleontologist Dr. Jeff Eaton for his pioneering work in the monument region..

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38-Simpson Et Al (Wahweap Fm).P65
Sullivan et al., eds., 2011, Fossil Record 3. New Mexico Museum of Natural History and Science, Bulletin 53. 380 UPPER CRETACEOUS DINOSAUR TRACKS FROM THE UPPER AND CAPPING SANDSTONE MEMBERS OF THE WAHWEAP FORMATION, GRAND STAIRCASE-ESCALANTE NATIONAL MONUMENT, UTAH, U.S.A. EDWARD L. SIMPSON1, H. FITZGERALD MALENDA1, MATTATHIAS NEEDLE1, HANNAH L. HILBERT-WOLF2, ALEX STEULLET3, KEN BOLING3, MICHAEL C. WIZEVICH3 AND SARAH E. TINDALL1 1 Department of Physical Sciences, Kutztown University, Kutztown, PA 19530; 2 Department of Geology, Carleton College, Northfield, MN, 55057; 3 Central Connecticut State University, Department of Physics and Earth Sciences, New Britain, Connecticut 06050, USA Abstract—Tridactyl tracks were identified in the fluvial strata of the Upper Cretaceous Wahweap Formation in Grand Staircase-Escalante National Monument, southern Utah, U.S.A. An isolated track and a trackway are located within the upper member at the Cockscomb, and an isolated track is in the capping sandstone member at Wesses Canyon. The upper member tracks are tridactyl pes imprints consisting of a longer, blunt digit III and shorter, blunt digits II-IV. This trace corresponds well to an ornithropod dinosaur as the trackmaker. The capping sandstone member track is a tridactyl pes with an elongate digit III and shorter digits II-IV. Claw impressions are present on the terminus of digits II and III. This trace is consistent with the pes impression of a one meter tall theropod. The tracks further highlight the diversity of dinosaurs in the capping sandstone of the Wahweap Formation. INTRODUCTION During the Late Cretaceous, North America, in particular the west- ern United States, was the site of a radiation of new dinosaurian genera.
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1 2 3 4 Revised geochronology, correlation, and dinosaur stratigraphic 5 ranges of the Santonian-Maastrichtian (Late Cretaceous) 6 formations of the Western Interior of North America 7 8 9 Denver Fowler 1* 10 11 12 13 1Dickinson Museum Center, Dickinson ND, USA 14 15 16 *Corresponding author 17 18 E-mail: [email protected] 1 PeerJ Preprints | https://doi.org/10.7287/peerj.preprints.2554v2 | CC BY 4.0 Open Access | rec: 4 Sep 2017, publ: 4 Sep 2017 19 Abstract 20 21 Interbasinal stratigraphic correlation provides the foundation for all consequent 22 continental-scale geological and paleontological analyses. Correlation requires synthesis 23 of lithostratigraphic, biostratigraphic and geochronologic data, and must be periodically 24 updated to accord with advances in dating techniques, changing standards for radiometric 25 dates, new stratigraphic concepts, hypotheses, fossil specimens, and field data. Outdated 26 or incorrect correlation exposes geological and paleontological analyses to potential error. 27 28 The current work presents a high-resolution stratigraphic chart for terrestrial Late 29 Cretaceous units of North America, combining published chronostratigraphic, 30 lithostratigraphic, and biostratigraphic data. 40 Ar / 39 Ar radiometric dates are newly 31 recalibrated to both current standard and decay constant pairings. Revisions to the 32 stratigraphic placement of most units are slight, but important changes are made to the 33 proposed correlations of the Aguja and Javelina Formations, Texas, and recalibration 34 corrections in particular affect the relative age positions of the Belly River Group, 35 Alberta; Judith River Formation, Montana; Kaiparowits Formation, Utah; and Fruitland 36 and Kirtland formations, New Mexico. 37 38 The stratigraphic ranges of selected clades of dinosaur species are plotted on the 39 chronostratigraphic framework, with some clades comprising short-duration species that 40 do not overlap stratigraphically with preceding or succeeding forms.
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