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Stratigraphy, Age and Correlation of the Upper Cretaceous Tohatchi Formation, Western New Mexico Spencer G
New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/54 Stratigraphy, age and correlation of the Upper Cretaceous Tohatchi Formation, western New Mexico Spencer G. Lucas, Dennis R. Braman, and Justin A. Spielmann, 2003, pp. 359-368 in: Geology of the Zuni Plateau, Lucas, Spencer G.; Semken, Steven C.; Berglof, William; Ulmer-Scholle, Dana; [eds.], New Mexico Geological Society 54th Annual Fall Field Conference Guidebook, 425 p. This is one of many related papers that were included in the 2003 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. -
The Dinosaur Park - Bearpaw Formation Transition in the Cypress Hills Region of Southwestern Saskatchewan, Canada Meagan M
The Dinosaur Park - Bearpaw Formation Transition in the Cypress Hills Region of Southwestern Saskatchewan, Canada Meagan M. Gilbert Department of Geological Sciences, University of Saskatchewan; [email protected] Summary The Upper Cretaceous Dinosaur Park Formation (DPF) is a south- and eastward-thinning fluvial to marginal marine clastic-wedge in the Western Canadian Sedimentary Basin. The DPF is overlain by the Bearpaw Formation (BF), a fully marine clastic succession representing the final major transgression of the epicontinental Western Interior Seaway (WIS) across western North America. In southwestern Saskatchewan, the DPF is comprised of marginal marine coal, carbonaceous shale, and heterolithic siltstone and sandstone grading vertically into marine sandstone and shale of the Bearpaw Formation. Due to Saskatchewan’s proximity to the paleocoastline, 5th order transgressive cycles resulted in the deposition of multiple coal seams (Lethbridge Coal Zone; LCZ) in the upper two-thirds of the DPF in the study area. The estimated total volume of coal is 48109 m3, with a gas potential of 46109 m3 (Frank, 2005). The focus of this study is to characterize the facies and facies associations of the DPF, the newly erected Manâtakâw Member, and the lower BF in the Cypress Hills region of southwestern Saskatchewan utilizing core, outcrop, and geophysical well log data. This study provides a comprehensive sequence stratigraphic overview of the DPF-BF transition in Saskatchewan and the potential for coalbed methane exploration. Introduction The Dinosaur Park and Bearpaw Formations in Alberta, and its equivalents in Montana, have been the focus of several sedimentologic and stratigraphic studies due to exceptional outcrop exposure and extensive subsurface data (e.g., McLean, 1971; Wood, 1985, 1989; Eberth and Hamblin, 1993; Tsujita, 1995; Catuneanu et al., 1997; Hamblin, 1997; Rogers et al., 2016). -
The Fauna from the Tyrannosaurus Rex Excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan
The Fauna from the Tyrannosaurus rex Excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan Tim T. Tokaryk 1 and Harold N. Bryant 2 Tokaryk, T.T. and Bryant, H.N. (2004): The fauna from the Tyrannosaurus rex excavation, Frenchman Formation (Late Maastrichtian), Saskatchewan; in Summary of Investigations 2004, Volume 1, Saskatchewan Geological Survey, Sask. Industry Resources, Misc. Rep. 2004-4.1, CD-ROM, Paper A-18, 12p. Abstract The quarry that contained the partial skeleton of the Tyrannosaurus rex, familiarly known as “Scotty,” has yielded a diverse faunal and floral assemblage. The site is located in the Frenchman River valley in southwestern Saskatchewan and dates from approximately 65 million years, at the end of the Cretaceous Period. The faunal assemblage from the quarry is reviewed and the floral assemblage is summarized. Together, these assemblages provide some insight into the biological community that lived in southwestern Saskatchewan during the latest Cretaceous. Keywords: Frenchman Formation, Maastrichtian, Late Cretaceous, southwestern Saskatchewan, Tyrannosaurus rex. 1. Introduction a) Geological Setting The Frenchman Formation, of latest Maastrichtian age, is extensively exposed in southwestern Saskatchewan (Figure 1; Fraser et al., 1935; Furnival, 1950). The lithostratigraphic units in the formation consist largely of fluvial sandstones and greenish grey to green claystones. Outcrops of the Frenchman Formation are widely distributed in the Frenchman River valley, southeast of Eastend. Chambery Coulee, on the north side of the valley, includes Royal Saskatchewan Museum (RSM) locality 72F07-0022 (precise locality data on file with the RSM), the site that contained the disarticulated skeleton of a Tyrannosaurus rex. McIver (2002) subdivided the stratigraphic sequence at this locality into “lower” and “upper” beds. -
Morphometry of the Teeth of Western North American Tyrannosaurids and Its Applicability to Quantitative Classification
Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification TANYA SAMMAN, G. LAWRENCE POWELL, PHILIP J. CURRIE, and LEONARD V. HILLS Samman, T., Powell, G.L., Currie, P.J., and Hills, L.V. 2005. Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification. Acta Palaeontologica Polonica 50 (4): 757–776. Gross tooth morphology and serration morphology were examined to determine a quantifiable method for classifying tyrannosaurid tooth crowns from western North America. From the examination of teeth in jaws, tyrannosaurid teeth could be qualitatively assigned to one of five types based on the cross−sectional shape of the base of the tooth and charac− teristics of the mesial carina. A principal component analysis (PCA) revealed that much of the variance in tooth shape was a result of isometry, but some gross morphological variables exhibited strong positive allometry. Non−size associated fac− tors were also important in determining tooth shape, particularly when data on denticle dimensions were considered in the analysis. While PCA identified important factors in variation, PCA ordination plots did not cluster the teeth into distinct, separate groupings based on taxon or bone of origin. The group classification functions determined by discriminant anal− ysis, though not universally successful for classifying unidentified isolated teeth of all tyrannosaurids, do identify bone of origin of adult Albertosaurus, Daspletosaurus, and Gorgosaurus teeth at a statistically acceptable level. Key words: Theropoda, Tyrannosauridae, dentition, classification, quantitative analysis, Cretaceous, North America. Tanya Samman [[email protected]] and Leonard.V. Hills [[email protected]], Department of Geology & Geo− physics, University of Calgary, AB, T2N 1N4 Canada; G. -
Belly River Group), Suffield Area, South Saskatchewan River Valley, Southeastern Alberta (NTS 72L/03) ERCB/AGS Open File Report 2011-06
ERCB/AGS Open File Report 2011-06 Measured Outcrop Section T13-R9W4-01 of the Foremost and Oldman Formations (Belly River Group), Suffield Area, South Saskatchewan River Valley, Southeastern Alberta (NTS 72L/03) ERCB/AGS Open File Report 2011-06 Measured Outcrop Section T13-R9W4-01 of the Foremost and Oldman Formations (Belly River Group), Suffield Area, South Saskatchewan River Valley, Southeastern Alberta (NTS 72L/03) B. Hathway, C.J. Banks, D.C. Hay and S. Mei Energy Resources Conservation Board Alberta Geological Survey July 2011 ©Her Majesty the Queen in Right of Alberta, 2011 ISBN 978-0-7785-8647-0 The Energy Resources Conservation Board/Alberta Geological Survey (ERCB/AGS), its employees and contractors make no warranty, guarantee or representation, express or implied, or assume any legal liability regarding the correctness, accuracy, completeness or reliability of this publication. Any reference to proprietary software and/or any use of proprietary data formats do not constitute endorsement by ERCB/AGS of any manufacturer's product. If you use information from this publication in other publications or presentations, please acknowledge the ERCB/AGS. We recommend the following reference format: Hathway, B., Banks, C.J., Hay, D.C. and Mei, S. (2011): Measured outcrop section T13-R9W4-01 of the Foremost and Oldman formations (Belly River Group), Suffield area, South Saskatchewan River valley, southeastern Alberta (NTS 72L/03); Energy Resources Conservation Board, ERCB/AGS Open File 2011-06, 14 p. Published July 2011 by: Energy Resources -
Competition Structured a Late Cretaceous Megaherbivorous Dinosaur Assemblage Jordan C
www.nature.com/scientificreports OPEN Competition structured a Late Cretaceous megaherbivorous dinosaur assemblage Jordan C. Mallon 1,2 Modern megaherbivore community richness is limited by bottom-up controls, such as resource limitation and resultant dietary competition. However, the extent to which these same controls impacted the richness of fossil megaherbivore communities is poorly understood. The present study investigates the matter with reference to the megaherbivorous dinosaur assemblage from the middle to upper Campanian Dinosaur Park Formation of Alberta, Canada. Using a meta-analysis of 21 ecomorphological variables measured across 14 genera, contemporaneous taxa are demonstrably well-separated in ecomorphospace at the family/subfamily level. Moreover, this pattern is persistent through the approximately 1.5 Myr timespan of the formation, despite continual species turnover, indicative of underlying structural principles imposed by long-term ecological competition. After considering the implications of ecomorphology for megaherbivorous dinosaur diet, it is concluded that competition structured comparable megaherbivorous dinosaur communities throughout the Late Cretaceous of western North America. Te question of which mechanisms regulate species coexistence is fundamental to understanding the evolution of biodiversity1. Te standing diversity (richness) of extant megaherbivore (herbivores weighing ≥1,000 kg) com- munities appears to be mainly regulated by bottom-up controls2–4 as these animals are virtually invulnerable to top-down down processes (e.g., predation) when fully grown. Tus, while the young may occasionally succumb to predation, fully-grown African elephants (Loxodonta africana), rhinoceroses (Ceratotherium simum and Diceros bicornis), hippopotamuses (Hippopotamus amphibius), and girafes (Girafa camelopardalis) are rarely targeted by predators, and ofen show indiference to their presence in the wild5. -
(Late Maastrichtian) Small Theropods and Birds: Teeth from The
Sankey, J.T. and S. Baszio, eds. 2008. Vertebrate Microfossil Assemblages: Their Role in Paleoecology and Paleobiogeography. Indiana University Press. Diversity of Latest Cretaceous (Late Maastrichtian) Small Theropods and Birds: Teeth from the Lance and Hell Creek Formations Julia T. Sankey Department of Physics and Geology, California State University, Stanislaus, Turlock, California 95382. [email protected] 1. Abstract Late Maastrichtian (latest Cretaceous) small theropod dinosaur and bird diversity has been difficult to determine because of scarcity or skeletal remains. Numerous teeth of small theropods and birds from the Hell Creek (Montana) and Lance (Wyoming) Formations were analyzed. Relative abundances are: dromaeosaurids (23%), troodontids (14%), cf. Richardoestesia isosceles (35%), cf. Paronychodon (20%), and bird (8%). This Maastrichtian theropod assemblage is different from the late Campanian one from Alberta in three ways: 1) the abundance (55%) of two unusual small theropods, cf. Richardoestesia isosceles and Paronychodon; 2) the abundance of teeth, from all taxa, with a flat side and longitudinal ridges; 3) the lower abundance and diversity of dromaeosaurids. The late Maastrichtian had a lower diversity of small theropods compared to the late Campanian possibly due to competition for 1 prey between dromaeosaurids and juvenile tyrannosaurids and climatic and/or climatic and environmental changes during the latest Cretaceous. Key Words Theropod, dinosaur, Maastrichtian, Late Cretaceous, Teeth, Diversity 2. Introduction 2.1. Previous work The first detailed descriptions of small theropod teeth was done by CURRIE et al. (1990) based on collections from the late Campanian Judith River Group of Alberta. Identification and reference of isolated teeth to known taxa was possible due to the existence of jaws with teeth from some of the small theropods. -
THE BIBLIOGRAPHY of HADROSAURIAN DINOSAURS the First 150 Years: 1856 - 2006
THE BIBLIOGRAPHY OF HADROSAURIAN DINOSAURS The First 150 Years: 1856 - 2006. complied by M.K. Brett-Surman © Smithsonian Institution 1985-2008 The Department of Paleobiology of the National Museum of Natural History, Smithsonian Institution, currently houses approximately 44 million fossil plant, invertebrate, and vertebrate fossils in more than 480 separate collections. In addition, Paleobiology also maintains a reference collection of over 120,000 stratigraphic and sediment samples. This listing represents a service provided to the public as part of our Outreach Program and as part of the Smithsonian Institution’s mission "for the increase and diffusion of knowledge...". Papers are listed by author and year. Author's names are capitalized. The viewer should be aware of any searches that are case sensitive. The papers listed here, in a majority of instances, do NOT contain abstracts, papers on ichnites, or popular articles or books, unless they present new information or cover an aspect of the history of dinosaur paleontology. At present, some of the legacy software that was used to maintain this list only allowed basic ASCII characters, therefore foreign accents (such as in French and Spanish) did not translate. This will be fixed at a later date. The Bibliography of Hadrosaurian Dinosaurs was written, compiled, and maintained by M.K. Brett-Surman, (Museum Specialist), P.O. Box 37012, Department of Paleobiology, National Museum of Natural History, MRC-121, Washington, DC 20013-7012. He can be reached electronically at: [email protected]., and by FAX at 202-786-2832. Please send all corrections and additions to the e-mail address. This file will be no longer be updated, except for entries prior to 2007. -
Dinosaur Paleontology and Taphonomy of a Mixed Bonebed
1 Sankey, J.T. In Press. In: New Perspectives on Horned Dinosaurs, M. Ryan, B. Chinnery- Allgeier, and D. Eberth (eds). Indiana University Press, Bloomington. Faunal Composition and Significance of High Diversity, Mixed Bonebeds Containing Agujaceratops mariscalensis and other Dinosaurs, Aguja Formation (Upper Cretaceous), Big Bend, Texas Julia T. Sankey Department of Physics and Geology, California State University, Stanislaus, One University Circle, Turlock, California 95382 U.S.A. [email protected] RH: Bonebeds and Agujaceratops in Big Bend 2 Abstract New sedimentologic and paleontologic information are presented from multiple, closely associated mixed bonebeds in the Aguja Formation (Campanian) from the Big Bend area of Texas. These bonebeds appear to have been deposited as component parts of channel lags during major flooding events. One of these bonebeds yields the most complete skull of Agujaceratops mariscalensis. Correlation of paleosols in the bonebed sections with those from the well studied Dawson Creek section (Big Bend), provides a critical stratigraphic context for A. mariscalensis and these bonebeds. Cumulatively, all the sites yield a rich assemblage of plants, invertebrates and other vertebrates. The combined vertebrate assemblage provides a means of assessing local terrestrial- community composition in the Late Cretaceous in Big Bend, and for comparing Late Cretaceous southern faunas with those of comparable age from Montana and Alberta. Introduction Big Bend National Park, Texas, is the southernmost area in the United States that yields Upper Cretaceous macrofossil dinosaur remains, as well as rich and diverse vertebrate microfossil assemblages. Although this area contains unique vertebrate assemblages, much less is known about them than those of similar age from regions farther north in Montana and Alberta. -
Examining the Molluscan Biostratigraphy of the Upper Cretaceous Judith River Formation, Montana Julie Amundsen
University of North Dakota UND Scholarly Commons Undergraduate Theses and Senior Projects Theses, Dissertations, and Senior Projects 2012 Examining the Molluscan Biostratigraphy of the Upper Cretaceous Judith River Formation, Montana Julie Amundsen Follow this and additional works at: https://commons.und.edu/senior-projects Recommended Citation Amundsen, Julie, "Examining the Molluscan Biostratigraphy of the Upper Cretaceous Judith River Formation, Montana" (2012). Undergraduate Theses and Senior Projects. 108. https://commons.und.edu/senior-projects/108 This Thesis is brought to you for free and open access by the Theses, Dissertations, and Senior Projects at UND Scholarly Commons. It has been accepted for inclusion in Undergraduate Theses and Senior Projects by an authorized administrator of UND Scholarly Commons. For more information, please contact [email protected]. I I 11 I I I Examining the molluscan biostratigraphy of the Upper I Cretaceous Judith River Formation, Montana I I By: I Julie Amundsen I Submitted to the University ofNorth Dakota In Partial Fulfillment of the Requirements for Graduation I Grand Forks, No11h Dakota I 05/ 10/2012 II I 1 I I 11 I Amundsen I I I I TABLE OF CONTENTS I ACKNOWLEDGEME TS ABSTRACT I lNTRODUCTJO I PURPOSE OF INVESTIGATION JUDITH RIVER FORMATION I GEOLOG IC HISTORY I HISTORI CAL BACKGRO UN D OVERV IEW OF PREV IO US STUDI ES I LITHOLOGY , SEDIME, roLOGY, STRA rlGRAPHY I PRESENT FIELD WORK AND MOLLUSCAN STUDIES ANALYSIS OF COLLECTIONS I A:-.JALYSIS OF 0RIGfNAL MA NUSCRIPT I FIELD WORK IN MONTANA LAB PROCESSES I RESULTS I DISCUSSION CONCLUSION I APPENDIX I A: MAPS AND FIGURE B: TABLES I C: PLATES I I Amundsen 2 I I I ACK OWLEDGEMENTS I This thesis probably would have not been accomplished if it were not for the help that I have received from many of the people in the geology department. -
A Juvenile Metatarsal of Cf. Daspletosaurus Torosus: Implications for Ontogeny in Tyrannosaurid Theropods
https://doi.org/10.35463/j.apr.2021.02.02 ACTA PALAEONTOLOGICA ROMANIAE (2021) V. 17(2), P. 15-22 A JUVENILE METATARSAL OF CF. DASPLETOSAURUS TOROSUS: IMPLICATIONS FOR ONTOGENY IN TYRANNOSAURID THEROPODS Chan-gyu Yun Received: 23 December 2020 / Accepted: 4 Marth 2021 / Published online: 14 Marth 2021 Abstract A well preserved, but isolated metatarsal III of a tyrannosaurid dinosaur, originating probably from the Di- nosaur Park Formation of Alberta, Canada, is tentatively referred to Daspletosaurus torosus. The size of the specimen suggests that it likely comes from a large juvenile, since the width of the distal end is about 63 % of that of a much larger individual. The morphology of the specimen supports the recently suggested hypotheses that apomorphies of tyrannosaurid taxa may have developed at young growth stages, and that juveniles of albertosaurines and tyranno- saurines may be easier to distinguish from one another than previously thought. Additionally, the specimen reported here is important in that it provides an addition to the very poor juvenile fossil record of Daspletosaurus. Keywords: Dinosauria, Tyrannosauridae, Daspletosaurus, metatarsal, juvenile INTRODUCTION better understanding tyrannosaurid ontogeny, as well as the general rarity of published postcranial osteological de- Ontogenetic dimorphism in tyrannosaurid theropods has scriptions and figures for Daspletosaurus torosus warrant been described in substantial detail for several species, its reporting and description. supported by the study of isolated cranial elements, com- plete skulls with different ontogenetic stages, and bonebed Institutional abbreviations assemblages including individuals representing multiple growth stages (e.g., Carr, 1999; Carr & Williamson, 2004; AMNH, American Museum of Natural History, New Carr, 2010; Voris et al., 2019; Carr, 2020; Yun, 2020a, York, U.S.A.; CMN, Canadian Museum of Nature, Ot- 2020b). -
(Late Cretaceous) Formation
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.