DOCSLIB.ORG

Geology of Northern California : Field Trip

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geology of Northern California : Field Trip NOTICE CONCERNING COPYRIGHT RESTRICTIONS This document may contain copyrighted materials. These materials have been made available for use in research, teaching, and private study, but may not be used for any commercial purpose. Users may not otherwise copy, reproduce, retransmit, distribute, publish, commercially exploit or otherwise transfer any material. The copyright law of the United States (Title 17, United States Code) governs the making of photocopies or other reproductions of copyrighted material. Under certain conditions specified in the law, libraries and archives are authorized to furnish a photocopy or other reproduction. One of these specific conditions is that the photocopy or reproduction is not to be "used for any purpose other than private study, scholarship, or research." If a user makes a request for, or later uses, a photocopy or reproduction for purposes in excess of "fair use," that user may be liable for copyright infringement. This institution reserves the right to refuse to accept a copying order if, in its judgment, fulfillment of the order would involve violation of copyright law. SUMMARY OF THE GEOLOGY OF THE GREAT VALLEY 3y Otto Hacki l \s AND On Co., Oa A close association exists between physiography and prehensive report on the entire Cireat \'alle\' by C. A. geology in nian\' parts of California, and although Repenning ( I960) has been of great value, and almost details may vary, large contiguous areas of the State all of the paleolithologic maps used herein are direct have distinctive features not shared bv the adjacent reproductions from his excellent report. terrane. These large ph\'siographic-geologic provinces Gcologicall\-, the Great Valley is a large elongate have been designated "geomorphic provinces" to indi- northwest-trending as\mmetric structural trough that cate that the division has been made subject to the has been filled with a tremendousl\' thick sequence of rock fabric. One of the largest and most obvious of sediments ranging in age from Jurassic to Recent. This these provinces in California is the Great \'alley^—the asymmetric geosyncline has a long stable eastern shelf topic of the following geologic summar\'. supported by the subsurface continuation of the grani- ; tic Sierran slope and a short western flank expressed The Great Valley of California, also called the Cen- by the upturned edges of the basin sediments. The tral \^alle\- of California or the San Joaquin-Sacra-- basin has a regional southward tilt, which is inter- mento \'alle\-, is a nearly flat alluvial plain extending significant cross-valley faults. from the Tehachapi Mountains on the south to the rupted by two The fault, is the Klamath Mountains on the north, and from the Sierra northernmost the Stockton fault, boundary geologists to separate the Great \'alley Nevada on the east to the Coast Ranges on the west. used by most Basin into two sub-basins, the Sacramento and San JThe valle\- is about 4.^0 miles long and has an average other great cross-fault lies near the width of about 50 miles. Elevations of the alluvial Joaquin. The southern extremity of the basin and has been named plain are generally just a few hundred feet above sea the White Wolf fault. level, with extremes ranging from a few feet below sea level to about 1,000 feet above. The only promi- STRATIGRAPHY nent topographic eminence within the central part of The Great Valle\- has been filled with a thick se- the valley is Marysville (Sutter) Buttes, a Pliocene quence of sedimentary rocks of Jurassic to Recent age, volcanic plug which rises abruptly 2,000 feet above but the locale of the thickest accumulation of sedi- the surrounding valley floor. ^ ments varied throughout geologic time. In th©J^ti- The northern portion of the valley is called the ary the thickest accumulation was along the western Sacramento Valley and the southern portion the San edge of the southern portion of the San Joaquin basin, Joaquin X'alley. Each of these segments is drained by about at the present position of the structural low. the river after which the valley has been named, and Mesozoic rocks, however, are thickest along the west these, after joining about 30 miles east of San Fran- side of the Sacramento basin, indicating that their cisco, empty into San Francisco Bay. The southern greatest deposition was probably west of the western extremity' of the San Joaquin \'alley, however, has edge of the present valley structural trough. It appears interior drainage via the Kings and Kern Rivers into likely that a minimum of 60,000 feet of Mesozoic sedi- the depressions that in the past supported Tulare and ments were laid down in the area just west of the Buena Vista Lakes. present margin of the Sacramento Valley. The Great Valley has been the source of about $10 The sedimentary sequence rests on a basement floor billion worth of crude oil, $2 billion worth of natural of nietamorphic and igneous rocks in the eastern half gas, and $1 billion worth of natural gas liquids. The of the valley. These basement rocks, which are ex- Sacramento V^alley part has yielded tremendous posed in the Sierra Nevada foothills, are composed of amounts of gas but almost no oil, whereas the San Paleozoic and Mesozoic metasediments and volcanics Joaquin V^alley has yielded both oil and gas. Because as well as Jurassic and Cretaceous granites. Along the of the differences between the two main parts of the west margin of the valley, where the very thick Meso- Great Valley, and to some extent because of its size, zoic strata are present, basement has not been ob- geologists, particularly petroleum geologists, have gen- served, either in outcrop or in well bores. Recent erally studied intensiveh" either the Sacramento or the studies indicate that the terrane lying between the San Joaquin Valley, but not both. As a result, rela- central part of the valley and the San Andreas fault tively few reports on the geology of the combined and containing Franciscan rocks is probabl\' underlain Sacramento-San Joaquin X'alley have been published. by a basaltic or ultramafic basement (Baile\-, et al, In the preparation of this article a little-known com- 1964). [217] 218 Gfoi.(k;v ok N'orhifrn Cai.ikorma Bull. 190 .•.::'»i^ 1966 Hackf.l: Great Vallky 219 The Jurassic, Cretaceous, and Tertiary rocks are, Pre-Uppermost Jurassic Rocks for the most part, of marine origin, though significant Except along the west side. Paleozoic and other pre- thicknesses of continental rocks are present in the uppermost Jurassic (pre-Tithonian) rocks are exposed Tertiary section. Through the entire sequence the on the highlands along the edges of the Great X'alley. rocks are almost entirel\' clastic, with siltstone, clay- These rocks appear to have been uplifted and region- stone, and sandstone, in that order, the dominant litho- ally metamorphosed near the close of the Jurassic logic types. E.xcept for rare occurrences, carbonate with accompanying intrusion of granitic batholiths. rocks are virtually absent. V^olcanic rocks compose Such rocks have been described from outcrops north about 10 percent of the Franciscan Formation and are of the Great X'allev in the Redding and Taylorsville present in minor, though important, amounts in the area, as well as all along the Sierra Nevada. Exotic Tertiary. blocks of marble and other metamorphic rocks of undetermined age in the San Emigdio Mountains, and Cretaceous deposits make up the predominant for- in the Temblor Range w est of Fellows, may indicate mations in the Sacramento Valley, while Tertiary such rocks were formerh' also exposed south and strata attain the greatest thickness in the San Joaquin southwest of the valley. Valley. The Cretaceous section is characterized by general lithologic similarities over great distances Uppermost Jurassic Rocks throughout the Great Valle\-. It is not unusual for one Recent geologic studies of the Upper Jurassic and to be able to recognize at a glance Cretaceous sedi- Cretaceous rocks of the Great \'alie\' and environs has ments at localities several hundred miles apart. On the led to the conclusion that two entirel_\' different suites other hand, the Tertiary strata are extremely variable of rocks were deposited at the same time in closely and rock units may change facies over very short adjoining areas (Irwin, 1957). These two units are the distances. Franciscan assemblage and the thick sequence of The sediments that form the thick valley section equivalent clastic rocks that are best exposed along were largely derived by erosion of land areas located the western edge of the Great \'alley. Both the have to the east of the depositional trough. For the major Franciscan and the Great X'alley sequence been fossil to Late portion of the Jurassic and Cretaceous sediments of proven through evidence range from it ap- the valley, the source area seems most likely to have Jurassic to Late Cretaceous. Consequenth-, now of been the batholiths of the Klamath Mountains and the pears that any discussion of the stratigraphy the Great Valley must include the Franciscan not as "base- Sierra Nevada. This hypothesis is based on the several eugeosynclinal facies of the miogeo- percent of K-feldspar found in these rocks and pre- ment," but as a synclinal V^alley sequence. sumed to have been derived from the granitic rocks Great of these northern and eastern highlands (Bailey and Franciscan Formation Irwin, 1959). The lack of K-feldspar in the valley The assemblage of rocks generally referred to as (east of the San Andreas fault) Franciscan Formation Franciscan is widely scattered throughout the west either indicates a different source area or that most side of the Great \'alley from Paskenta south to Park- of this formation predates the unroofing of the batho- field.
Load more

Recommended publications
  • A Revision of the Classification of the Plesiosauria with a Synopsis of the Stratigraphical and Geographical Distribution Of
    LUNDS UNIVERSITETS ARSSKRIFT. N. F. Avd. 2. Bd 59. Nr l. KUNGL. FYSIOGRAFISKA SÅLLSKAPETS HANDLINGAR, N. F. Bd 74. Nr 1. A REVISION OF THE CLASSIFICATION OF THE PLESIOSAURIA WITH A SYNOPSIS OF THE STRATIGRAPHICAL AND GEOGRAPHICAL DISTRIBUTION OF THE GROUP BY PER OVE PERSSON LUND C. W. K. GLEER UP Read before the Royal Physiographic Society, February 13, 1963. LUND HÅKAN OHLSSONS BOKTRYCKERI l 9 6 3 l. Introduction The sub-order Plesiosauria is one of the best known of the Mesozoic Reptile groups, but, as emphasized by KuHN (1961, p. 75) and other authors, its classification is still not satisfactory, and needs a thorough revision. The present paper is an attempt at such a revision, and includes also a tabular synopsis of the stratigraphical and geo­ graphical distribution of the group. Some of the species are discussed in the text (pp. 17-22). The synopsis is completed with seven maps (figs. 2-8, pp. 10-16), a selective synonym list (pp. 41-42), and a list of rejected species (pp. 42-43). Some forms which have been erroneously referred to the Plesiosauria are also briefly mentioned ("Non-Plesiosaurians", p. 43). - The numerals in braekets after the generic and specific names in the text refer to the tabular synopsis, in which the different forms are numbered in successional order. The author has exaroined all material available from Sweden, Australia and Spitzbergen (PERSSON 1954, 1959, 1960, 1962, 1962a); the major part of the material from the British Isles, France, Belgium and Luxembourg; some of the German spec­ imens; certain specimens from New Zealand, now in the British Museum (see LYDEK­ KER 1889, pp.
    [Show full text]
  • Source-Rock Geochemistry of the San Joaquin Basin Province, California
    Petroleum Systems and Geologic Assessment of Oil and Gas in the San Joaquin Basin Province, California Chapter 11 Source-Rock Geochemistry of the San Joaquin Basin Province, California By Kenneth E. Peters, Leslie B. Magoon, Zenon C. Valin, and Paul G. Lillis HIO for all source-rock units except the Tumey formation of Contents Atwill (1935). Abstract-----------------------------------------------------------------------------------1 Thick, organic-rich, oil-prone shales of the upper Mio- Introduction------------------------------------------------------------------------------ 1 cene Monterey Formation occur in the Tejon depocenter in Methods----------------------------------------------------------------------------------2 the southern part of the basin with somewhat less favorable Discussion--------------------------------------------------------------------------------3 occurrence in the Southern Buttonwillow depocenter to the Upper Miocene Antelope shale---------------------------------------------------3 north. Shales of the upper Miocene Monterey Formation Eocene Tumey formation-----------------------------------------------------------4 Eocene Kreyenhagen Formation--------------------------------------------------4 generated most of the petroleum in the San Joaquin Basin. Cretaceous-Paleocene Moreno Formation--------------------------------------5 Thick, organic-rich, oil-prone Kreyenhagen Formation source Conclusions----------------------------------------------------------------------------- -5 rock occurs in the Buttonwillow
    [Show full text]
  • Appendices D Through I
    Appendix D Operation & Maintenance Appendix D. Operation and Maintenance Plan Operation and Maintenance Plan This document presents the operation and maintenance (O&M) plan for Western Area Power Administration’s (Western) Sierra Nevada Region (SNR) transmission line systems. 1.0 Inspection/System Management In compliance with Western’s Reliability Centered Maintenance Program, Western would conduct aerial, ground, and climbing inspections of its existing transmission infrastructure since initial construction. The following paragraphs describe Western’s inspection requirements. Aerial Inspections Aerial inspections would be conducted a minimum of every 6 months by helicopter or small plane over the entire transmission system to check for hazard trees1 or encroaching vegetation, as well as to locate damaged or malfunctioning transmission equipment. Typically, aerial patrols would be flown between 50 and 300 feet above Western’s transmission infrastructure depending on the land use, topography, and infrastructure requirements. In general, the aerial inspections would pass over each segment of the transmission line within a one-minute period. Ground Inspections Annual ground inspections would check access to the towers/poles, tree clearances, fences, gates, locks, and tower hardware, and ensure that each structure would be readily accessible in the event of an emergency. They would allow for the inspection of hardware that would not be possible by air, and identify redundant or overgrown access roads that should be permanently closed and returned to their natural state. Ground inspections would typically be conducted by driving a pickup truck along the ROW and access roads. Detailed ground inspections would be performed on 20 percent of all lines and structures annually, for 100 percent inspection every 5 years.
    [Show full text]
  • Revision of the Genus Styxosaurus and Relationships of the Late Cretaceous Elasmosaurids (Sauropterygia: Plesiosauria) of the Western Interior Seaway
    Marshall University Marshall Digital Scholar Theses, Dissertations and Capstones 2020 Revision of the Genus Styxosaurus and Relationships of the Late Cretaceous Elasmosaurids (Sauropterygia: Plesiosauria) of the Western Interior Seaway Elliott Armour Smith Follow this and additional works at: https://mds.marshall.edu/etd Part of the Biology Commons, Paleobiology Commons, and the Paleontology Commons REVISION OF THE GENUS STYXOSAURUS AND RELATIONSHIPS OF THE LATE CRETACEOUS ELASMOSAURIDS (SAUROPTERYGIA: PLESIOSAURIA) OF THE WESTERN INTERIOR SEAWAY A thesis submitted to the Graduate College of Marshall University In partial fulfillment of the requirements for the degree of Master of Science In Biological Sciences by Elliott Armour Smith Approved by Dr. F. Robin O’Keefe, Committee Chairperson Dr. Habiba Chirchir, Committee Member Dr. Herman Mays, Committee Member Marshall University May 2020 ii © 2020 Elliott Armour Smith ALL RIGHTS RESERVED iii DEDICATION Dedicated to my loving parents for supporting me on my journey as a scientist. iv ACKNOWLEDGEMENTS I would like to thank Dr. Robin O’Keefe for serving as my advisor, and for his constant mentorship and invaluable contributions to this manuscript. I would like to thank Dr. Herman Mays and Dr. Habiba Chirchir for serving on my committee and providing immensely valuable feedback on this manuscript and the ideas within. Thanks to the Marshall University Department of Biological Sciences for travel support. I would like to thank curators Ross Secord (University of Nebraska), Chris Beard (University of Kansas), Tylor Lyson (Denver Museum of Nature and Science), and Darrin Paginac (South Dakota School of Mines and Technology) for granting access to fossil specimens. Thanks to Joel Nielsen (University of Nebraska State Museum), Megan Sims (University of Kansas), Kristen MacKenzie (Denver Museum of Nature and Science) for facilitating access to fossil specimens.
    [Show full text]
  • The Mosasaur Prognathodon from the Upper Cretaceous Lewis Shale Near Durango, Colorado and Distribution of Prognathodon in North America Spencer G
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/56 The Mosasaur Prognathodon from the Upper Cretaceous Lewis Shale near Durango, Colorado and distribution of Prognathodon in North America Spencer G. Lucas, Takehito Ikejiri, Heather Maisch, Thomas Joyce, and Gary L. Gianniny, 2005, pp. 389-393 in: Geology of the Chama Basin, Lucas, Spencer G.; Zeigler, Kate E.; Lueth, Virgil W.; Owen, Donald E.; [eds.], New Mexico Geological Society 56th Annual Fall Field Conference Guidebook, 456 p. This is one of many related papers that were included in the 2005 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.
    [Show full text]
  • FOSSIL Project Newsletter Spring 2017
    News from the FOSSIL Project Vol. 4, Issue 1, Spring 2017 [email protected] www.myfossil.org @projectfossil The FossilProject Inside this issue: FOSSIL PROJECT UPDATES SPRING 2017 Featured Professional: by Eleanor Gardner James R. Thomka Personnel Updates Amateur Spotlight: We are proud to announce that Linda McCall, president Malcolm W. Bedell, Jr. of the North Carolina Fossil Club, has joined the FOSSIL Project’s steering committee. She will serve on the committee Featured Organization: through December 2017 and help to keep amateur interests Georgia Paleontological represented as the FOSSIL Project enters its final 1.5 years of Association funding. After her term is up, Linda will aid us in identifying another representative to serve on the committee. Linda has Horse Teeth and California already provided many excellent ideas and feedback, and we Crocs appreciate her continued commitment to the Project and the myFOSSIL community. Megalodon Tooth Deformities Linda McCall News from the Paleontological Society Dealing with a Fossil Estate As a member of the Paleontological Society Executive Committee, Bruce can report that we now have more than 50 members who have opted for the new amateur New Characters in Big Horn member category. The PS is very excited about this response so far, and we look Basin Paleontology forward to a continuing increase in representation from amateurs. We hope that the benefits of the PS will make membership attractive and also result in a continued California’s State Dino positive and supportive spirit of working together to advance the study of fossils and paleontology. DPS Releases “Guide to Fossil Collecting” Every year the PS receives nominations for the Strimple Award given to an amateur who has made sustained contributions to paleontology.
    [Show full text]
  • As Exposed Along the Western Border of the San Joaquin Valley North Of
    VOL. 25, 1939 PALEONTOLOGY: C. STOCK 6176 OCCURRENCE OF CRETACEOUS REPTILES IN THE MORENO SHALES OF THE SOUTHERN COAST RANGES, CALIFORNIA By CHESTER STOCK BALCH GRADUATE SCHOOL OF THE GEOLOGICAL SCIENCES, CALIFORNIA INSTITUTE OF TECHNOLOGY Communicated November 6, 1939 Recently, S. P. Welles called attention to a plesiosaur from the Upper Cretaceous of the San Joaquin Valley, California, and on the basis of its skeletal characters, long neck and short head, referred this sauropterygian to the family Elasmosauridae.1 During the past summer, field parties from the California Institute of Technology explored the Moreno forma- tion as exposed in the Panoche Hills, northwestern Fresno County. Our attention was drawn specifically to this region by the discovery of reptilian remains by Robert T. White of the Barnsdall Oil Company, The ma- terials found by Mr. White proved to be on excavation a shoulder girdle, one flipper, a series of sixty or more vertebrae and remains of the posterior part of the skull and jaws of a plesiosaur. Apparently the marine reptile represented by these remains possesses several of the characters noted by Welles in the plesiosaur found approximately five miles farther north in the Panoche Hills, although the second specimen is distinctly smaller than the first. Further search in the region where the second plesiosaur was found re- vealed the presence of two other types of reptiles. These represent mosa- saurs and an hadrosaurian dinosaur. Both types are of interest, and the latter particularly, because for many years no record has been made of the presence of these groups in Cretaceous deposits of.
    [Show full text]
  • A Dinosaur for California! by Karol Mcqueary President, Southern California Paleontological Society (SCPS)
    San Diego Mineral & Gem Society, Inc. The Pegmatite – April 2017 Page 15 A Dinosaur for California! by Karol McQueary President, Southern California Paleontological Society (SCPS) ALIFORNIA, like all states, has C many symbols – the state tree (redwood), state marine fish (Garibaldi), state fossil (Smilodon fatalis), and even a state insect (the dogface butterfly), just to name a few. But now, thanks to an enterprising law student’s idea two years ago, it looks like California will also have an official state dinosaur. This dino, Augustynolophus morrisi, is a crested hadrosaur, an herbivore about 26 feet in length, and is only found in California. It dates to the late Maastrichtian Age, thus placing it as one of the last known dinosaurs before the K-T extinction. Only two specimens have been uncovered, both in the Moreno formation of the Panoche Hills of Fresno County, roughly in the geographical center of the state. Augustynolophus, reproduced courtesy of @augustynolophus. The two specimens, excavated from 1939 to committee and will now be taken to the Assembly 1940 by a team from the California Institute of floor for a vote. From there it will go through the same Technology (Caltech), were thought to belong to the process in the State Senate and then on to Governor Saurolophus genus, but recent in-depth study of the Jerry Brown for signature. The Southern California fossils revealed that the cranial structure was quite Paleontological Society is joining the effort as a co- unlike the other Saurolophus dinosaurs. A paper sponsor, and society members will be appearing co-authored in 2014 by Albert Prieto-Márquez, before the State Senate to speak for passage of this Johathan R.
    [Show full text]
  • A New Specimen of Cardiocorax Mukulu with a Nearly Complete Cranium from Angola
    Miguel Patrick Marx BS Geologia A new specimen of Cardiocorax mukulu with a nearly complete cranium from Angola Dissertação para obtenção do Grau de Mestre em Paleontologia Orientador: Octávio Mateus, Prof. Associado com Agregação FCT-UNL 19 May 2020 May 2020 Miguel Patrick Marx BS Geologia A new specimen of Cardiocorax mukulu with a nearly complete cranium from Angola Dissertação para obtenção do Grau de Mestre em Paleontologia Orientador: Octávio Mateus, Prof. Associado com Agregação FCT-UNL i Acknowledgments Firstly, I would like to thank my advisor, Octávio Mateus, for allowing me to work on this incredible specimen, guiding me throughout the process of this work, and being an incredible mentor and friend. I would like to thank Mike Polcyn and Louis Jacobs for their generous advice, mentorship, and for introducing me to the two rules. I want to also thank Ricardo Araújo for the advice on how to measure plesiosaur vertebrae. I am immensely grateful to Projecto PaleoAngola for funding my stay in Angola for the 2019 summer excavation, and the Institute of Study for Earth and Man at SMU for funding my trip to Dallas in Dec. of 2017, providing financial aid for my visit in Nov. of 2019, and funding the CT scan of the cranium from MGUAN PA278. I also thank Chris Beard and Megan Sims for organizing my collection visit to the University of Kansas and Ross Seacord, George Corner, and Shane Tucker for accommodating my visit to the University of Nebraska- Lincoln in April of 2019. I would also like to thank Elliot Smith for providing a photograph of the skull of Thalassomedon haningtoni (UNSM 50132).
    [Show full text]
  • G. Cultural Resources
    LSA ASSOCIATES, INC. DOWNTOWN MARTINEZ DRAFT SPECIFIC PLAN EIR DECEMBER 2004 IV. SETTING, IMPACTS AND MITIGATION MEASURES G. CULTURAL RESOURCES G. CULTURAL RESOURCES This section describes the baseline conditions for paleontological and cultural resources within or adjacent to the Plan area. The potential impact associated with implementation of the Draft Specific Plan are evaluated and mitigation measures are recommended as appropriate. 1. Setting This section describes existing conditions of cultural and paleontological resources in order to assess potential impacts to such resources as a result of the implementation of the proposed Plan. Paleon- tological resources consist of fossils and their immediate surroundings, while cultural resources can consist of prehistoric and historical archaeological sites, buildings, structures, or objects significant in local, regional, or national history. Baseline conditions are determined by: (1) identifying known paleontological and cultural resources; (2) providing a brief overview of the planning area’s geologi- cal and historical background; and (3) describing the cultural resource laws, codes, and regulations applicable to the Plan area. a. Paleontological Resources. The following section briefly describes Martinez’s geological setting, identifies those formations that may contain paleontological resources, and provides a pre- liminary sensitivity assessment for the occurrence of such resources within or adjacent to the planning area. (1) Overview. CEQA Guidelines, Appendix G(V)(c), establish
    [Show full text]
  • A New Species of Saurolophine Hadrosaurid Dinosaur from the Late Cretaceous of the Pacific Coast of North America
    A new species of saurolophine hadrosaurid dinosaur from the Late Cretaceous of the Pacific coast of North America ALBERT PRIETO−MÁRQUEZ and JONATHAN R. WAGNER Prieto−Márquez, A. and Wagner, J.R. 2013. A new species of saurolophine hadrosaurid dinosaur from the Late Creta− ceous of the Pacific coast of North America. Acta Palaeontologica Polonica 58 (2): 255–268. We describe and re−evaluate the systematics of specimens from the Maastrichtian Moreno Formation of California (west− ern USA) as a new species of Saurolophus, the only known genus of hadrosaurid dinosaur widespread in Asia and North America. Recognition of this new species adds substantially to the record of the taxonomic diversity of these animals west of the Rocky Mountains. The new species, Saurolophus morrisi, is diagnosed by the possession of a postorbital having or− namentation in form of wide oblique groove on jugal process. Placement of this new species in Saurolophus considerably expands the distribution of this genus, although this referral is arbitrary since phylogenetic analysis places the new species outside of the clade formed by Saurolophus osborni and Saurolophus angustirostris. However, recognition of a new, en− demic Californian hadrosaurid, especially one so closely related to both Asian and North American species, may have im− plications for future studies of both the internal biogeography of Western North America, and the history of exchange with Asia. Key words: Dinosauria, Hadrosauridae, Saurolophinae, evolution, phylogenetics, Cretaceous, North America. Albert Prieto−Márquez [[email protected]], Bayerische Staatssammlung für Paläontologie und Geologie, Rich− ard−Wagner−Straße 10, D−80333 Munich, Germany; Jonathan R. Wagner [[email protected]], Jackson School of Geosciences, The University of Texas at Aus− tin, 1 University Station C1100, Austin, Texas 78712−1101, USA.
    [Show full text]
  • Second Mosasaur Meeting
    SECOND MOSASAUR MEETING May 2-6, 2007 Abstract Booklet Michael J. Everhart, (ed.) Fort Hays State University Sternberg Museum of Natural History 3000 Sternberg Drive Hays, Kansas 67601-2006 2 Second Mosasaur Meeting, Sternberg Museum, Hays, Kansas, May 3-6, 2007 MEETING SCHEDULE Thursday, May 3, 2007: Sessions 8:00 AM Registration opens 9:00 AM Welcome by Dr. Jerry Choate, Director, Sternberg Museum of Natural History Opening remarks and orientation: Mike Everhart 9:30 AM FIRST SESSION - Moderator: Mike Everhart 9:30 AM THE MOSASAURS OF GEORGE F. STERNBERG, PALEONTOLOGIST AND FOSSIL PHOTOGRAPHER Michael J. Everhart 10:00 AM FIRST RECORD OF STOMACH CONTENTS IN TYLOSAURUS NEPAEOLICUS AND COMMENTS ON PREDATION AMONG MOSASAURIDAE Gorden L. Bell, Jr. and Kenneth R. Barnes 10:30 AM BREAK 11:00 AM SECOND SESSION – Moderator: Anne Schulp 11:00 AM THE ANATOMY AND SYSTEMATICS OF TYLOSAURINE MOSASAURS Timon S. Bullard and Michael W. Caldwell 11:30 AM CHRONOSTRATIGRAPHIC DISTRIBUTION OF MOSASAUROIDS FROM THE BIG BEND REGION OF WEST TEXAS Gorden L. Bell, Jr., Kenneth R. Barnes, and Michael Polcyn. NOON LUNCH (Provided) 1:00 PM THIRD SESSION – Moderator: Gorden Bell 1:00 PM TOOTH ATTACHMENT AND TOOTH REPLACEMENT PATTERNS IN MOSASAURS Michael W. Caldwell 1:30 PM ONTOGENETIC CHANGES IN THE MARGINAL DENTITION OF TYLOSAURUS PRORIGER (SQUAMATA: MOSASAURIDAE): ECOLOGICAL AND EVOLUTIONARY IMPLICATIONS Takuya Konishi 2:00 PM MORE ON CARINODENS BELGICUS FROM THE MAASTRICHTIAN TYPE AREA John W. M. Jagt, Anne S. Schulp and Eric W. A. Mulder 2:30 PM BREAK 3:00 PM FOURTH SESSION – Moderator: Johan Lindgren 3:00 PM PRELIMINARY OBSERVATIONS ON CAMPANIAN MOSASAURS IN ARKANSAS Kelly J.
    [Show full text]