DOCSLIB.ORG

PIR/PER) for the State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County, California E-FIS 0801-000144 (EA 08-0C970

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
PIR/PER) for the State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County, California E-FIS 0801-000144 (EA 08-0C970 Combined Paleontological Identification Report / Paleontological Evaluation Report (PIR/PER) for the State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County, California E-FIS 0801-000144 (EA 08-0C970) Submitted to: Kurt Heidelberg, Branch Chief Environmental Studies D California Department of Transportation, District 8 464 West 4th Street, 6th Floor, MS 825 San Bernardino, California 92401-1400 March 2018 EXECUTIVE SUMMARY The City of Coachella (City), in cooperation with the California Department of Transportation (Caltrans) District 8 and Coachella Valley Association of Governments (CVAG), proposes the construction of a new interchange at State Route 86 (SR-86) and Avenue 50 in the City of Coachella, Riverside County, California. The SR-86 /Avenue 50 New Interchange Project (Project) consists of converting a portion of SR-86 from an existing expressway to a freeway with a new overcrossing structure and access ramps. In addition, the proposed Project includes the realignment and widening of Avenue 50 and the realignment of portions of Tyler Street on both the east and west sides of SR-86. Finally, the Project would construct a new bridge over the Coachella Valley Stormwater Channel (CVSC) to replace the existing low water crossing. At the request of TranSystems, Applied EarthWorks, Inc. (Æ) performed a paleontological resource assessment in support of the proposed Project. The study consisted of a search of museum collections records maintained by the Natural History Museum of Los Angeles County, a comprehensive literature and geologic map review, a field reconnaissance survey, and preparation of this combined Paleontological Identification Report (PIR) / Paleontological Evaluation Report (PER). This PIR/PER summarizes the methods and results of a paleontological resource assessment and provides Project-specific management recommendations. The purpose of the literature review and museum records search was to identify the geologic units underlying the Project area and to determine whether previously recorded paleontological localities occur either within the Project boundaries or within the same geologic units elsewhere. The museum records search was supplemented by a search of the University of California Museum of Paleontology’s online collections database. Following the literature and museum searches, a field survey was conducted in order to inspect the ground surface visually for exposed fossils and to evaluate geologic exposures for their potential to contain preserved fossil material at the subsurface. Using the results of museum records search and field survey, the paleontological resource potential of the Project area was determined in accordance with Society of Vertebrate Paleontology (2010) and Caltrans (2016) guidelines. Published geologic maps indicate the Project area is underlain by Holocene to Late Pleistocene sedimentary deposits. Museum records contained no previously recorded paleontological localities directly within Project boundaries; however, at least four scientifically significant fossil localities have been recorded in similar sediments nearby. No surface fossils were discovered in the Project area during the course of fieldwork. As a result of this study, the Project area is determined to have a low to high paleontological resource potential (i.e., sensitivity), and the likelihood of impacting scientifically significant fossils because of Project development is low to high. As a result, nonrenewable paleontological resources may be at risk of being adversely impacted by ground-disturbing activities during construction of the Project. Therefore, a qualified paleontologist should be retained to oversee further paleontological resource management, including preconstruction worker environmental PIR/PER – State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County i training and preparation/implementation of a Paleontological Mitigation Plan during Project construction. By implementing these management recommendations, adverse impacts to paleontological resources can be reduced to a less than significant level pursuant to the requirements of the California Environmental Quality Act. PIR/PER – State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County ii CONTENTS EXECUTIVE SUMMARY ............................................................................................................ I 1 PROPOSED PROJECT ....................................................................................................1 1.1 PROJECT DESCRIPTION AND EXCAVATION PARAMETERS .......................1 1.2 PURPOSE OF INVESTIGATION ..........................................................................4 1.3 REPORT ORGANIZATION....................................................................................4 2 REGULATORY ENVIRONMENT ..................................................................................5 2.1 CALIFORNIA ENVIRONMENTAL QUALITY ACT OF 1970 (PUBLIC RESOURCES CODE [PRC] SECTION 21000 ET SEQ.) ........................................................................................................................5 2.2 PUBLIC RESOURCES CODE SECTION 5097.5 .................................................5 3 PALEONTOLOGICAL SENSITIVITY AND SIGNIFICANCE ..................................6 3.1 DEFINITION OF PALEONTOLOGICAL RESOURCES AND SIGNIFICANCE CRITERIA ..................................................................................6 3.2 PROFESSIONAL STANDARDS AND SVP CATEGORIES OF PALEONTOLOGICAL RESOURCE SENSITIVITY ............................................6 3.3 CALTRANS STANDARD ENVIRONMENTAL REFERENCE ...........................8 4 METHODS .........................................................................................................................9 4.1 LITERATURE REVIEW AND RECORDS SEARCH ...........................................9 4.2 FIELDWORK ..........................................................................................................9 4.3 KEY PERSONNEL .................................................................................................9 5 GEOLOGY AND PALEONTOLOGY ...........................................................................10 5.1 REGIONAL GEOLOGY .......................................................................................10 5.2 GEOLOGY AND PALEONTOLOGY OF THE PROJECT AREA ......................10 5.2.1 Quaternary Surficial Sediments (Qya, Qyf, Qe, and Qw) .........................10 6 ANALYSIS AND RESULTS ...........................................................................................13 6.1 MUSEUM RECORDS SEARCH RESULTS ........................................................13 6.2 PALEONTOLOGICAL FIELD RECONNAISSANCE ........................................13 6.3 DETERMINATION OF PALEONTOLOGICAL RESOURCE POTENTIAL FOR GEOLOGIC UNITS WITHIN THE PROJECT AREA .....................................................................................................................16 7 FINDINGS ........................................................................................................................19 8 RECOMMENDATIONS .................................................................................................20 8.1 WORKER’S ENVIRONMENTAL AWARENESS TRAINING ...........................20 8.2 PALEONTOLOGICAL MITIGATION MONITORING ......................................20 8.3 FOSSIL PREPARATION, CURATION, AND REPORTING ...............................20 PIR/PER – State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County iii 9 REFERENCES CITED ...................................................................................................22 APPENDIX A Natural History Museum of Los Angeles County Record Search Results B Personnel Qualifications FIGURES 1-1 Project Vicinity Map ........................................................................................................... 2 1-2 Project Location Map .......................................................................................................... 3 5-1 Geologic units underlying the Project area. .......................................................................11 6-1 Overview of the Project area west of the CVSC, showing the disturbed surficial sediments. View to the southwest. .............................................................................. 15 6-2 Overview of the Project area east of the CVSC ................................................................ 15 6-3 View of the Project area east of the CVSC ....................................................................... 16 6-4 Paleontological sensitivity of the geologic units underlying the Project area. ................. 18 TABLES 3-1 Paleontological Sensitivity Classifications ......................................................................... 7 6-1 Vertebrate Localities within the Vicinity of the Project Area in Riverside County .......... 13 6-2 Geologic Units in the Project Area and Their Paleontological Sensitivity ....................... 17 PIR/PER – State Route 86 / Avenue 50 New Interchange Project, City of Coachella, Riverside County iv 1 PROPOSED PROJECT The City of Coachella (City), in cooperation with the California Department of Transportation (Caltrans) District 8 and Coachella Valley Association of Governments (CVAG), proposes the construction of a new interchange at State Route 86 (SR-86) and Avenue 50 in the City of Coachella,
Load more

Recommended publications
  • Micropaleontological Association from the Middle Miocene Badenian Gypsum Deposits of Paratethys
    geosciences Article A New Preparation Method of Microfauna from Gypsum: Micropaleontological Association from the Middle Miocene Badenian Gypsum Deposits of Paratethys Hans-Peter Bojar 1, Claudia Antoniade 2, Victor Barbu 3 and Ana-Voica Bojar 1,4,5,* 1 Studienzentrum Naturkunde—Mineralogie, Universalmuseum Joanneum, Weinzöttlstraße 16, 8045 Graz, Austria; [email protected] 2 OMV Petrom, Research and Design Institute of Technology Petrom Câmpina, Culturii Bldv 29, Câmpina, 15600 Prahova, Romania; [email protected] 3 OMV Petrom, Coralilor str. 22, 013329 Bucharest, Romania; [email protected] 4 Department Geographie und Geologie, Geologie, University of Salzburg, Hellbrunnerstraße 34, 5020 Salzburg, Austria 5 Faculty of Physics, Department of Structure of Matter, Earth and Atmospheric Physics and Astrophysics, University of Bucharest, Bulevardul Regina Elisabeta 4-12, 030018 Bucharest, Romania * Correspondence: [email protected] Received: 23 March 2020; Accepted: 26 April 2020; Published: 28 April 2020 Abstract: Evaporitic gypsum deposits represent an important paleoenvironmental record of the Miocene Badenian of the Carpathian Mountains belt. In this study, we developed a nontoxic method to concentrate calcareous microfossils from gypsum (CaSO 2H O), by treating the sulfate with 4· 2 ammonium acetate. We applied the newly developed method to gypsum collected from the Evaporitic Formation outcropping northward of Slănic-Prahova in the Eastern Carpathians. For the first time for this formation, we describe a calcareous microfossil assemblage characterized by the presence of planktonic foraminifera as well as cysts and fragments of calcareous algae. Keywords: chemical preparation method; gypsum deposits; calcareous microfossil assemblage; Miocene; Eastern Carpathians 1. Introduction In the Earth’s history, sulfate rich marine waters are known for late Precambrian (Vendian), Pennsylvanian-Triassic, Miocene to Quaternary [1].
    [Show full text]
  • Raymond M. Alf Museum of Paleontology EDUCATOR's GUIDE
    Raymond M. Alf Museum of Paleontology EDUCATOR’S GUIDE Dear Educator: This guide is recommended for educators of grades K-4 and is designed to help you prepare students for their Alf Museum visit, as well as to provide resources to enhance your classroom curriculum. This packet includes background information about the Alf Museum and the science of paleontology, a summary of our museum guidelines and what to expect, a pre-visit checklist, a series of content standard-aligned activities/exercises for classroom use before and/or after your visit, and a list of relevant terms and additional resources. Please complete and return the enclosed evaluation form to help us improve this guide to better serve your needs. Thank you! Paleontology: The Study of Ancient Life Paleontology is the study of ancient life. The history of past life on Earth is interpreted by scientists through the examination of fossils, the preserved remains of organisms which lived in the geologic past (more than 10,000 years ago). There are two main types of fossils: body fossils, the preserved remains of actual organisms (e.g. shells/hard parts, teeth, bones, leaves, etc.) and trace fossils, the preserved evidence of activity by organisms (e.g. footprints, burrows, fossil dung). Chances for fossil preservation are enhanced by (1) the presence of hard parts (since soft parts generally rot or are eaten, preventing preservation) and (2) rapid burial (preventing disturbance by bio- logical or physical actions). Many body fossils are skeletal remains (e.g. bones, teeth, shells, exoskel- etons). Most form when an animal or plant dies and then is buried by sediment (e.g.
    [Show full text]
  • FOSSIL PREPARATION KIT by Dave Letasi and Terrie Nolinske
    p FOSSIL PREPARATION KIT By Dave Letasi and Terrie Nolinske DESCRIPTION This kit includes a real fossil bone from a prehistoric animal and a fossil of a marine animal. A scientific label is also provided with your fossil specimens. The Fossil Preparation Kit instructs you in the cleaning and preparation of invertebrate and vertebrate fossils, following the same process used by paleontologists. By adding several common household items, you can create a fossil preparation lab in your classroom or kitchen. In the first activity, you use basic tools to clean a marine invertebrate fossil. Using a mild household chemical, you will remove the rocky crust found on the fossil and study the details of its anatomical structures. In the second activity, you will preserve fossil vertebrate bone fragments before fitting the fragments back together to create the original structure. GOALS You will be able to… demonstrate procedures used by scientists to reconstruct fossil fragments and turn them into specimens for study or display; learn and implement scientific procedures used in the safe handling of chemicals used for cleaning fossils; and identify at least three ways in which fossils allow scientists to study life forms from the prehistoric past. ARE YOU A TEACHER? The subject matter in this kit is aligned with the following Sunshine State Standards: Grades 3-5: SC. D.1.2.1, SC. D. 2.2.1 SC. H.! 2.1, SC.H.1.2.2, SC.H.2.2.1 Grades 6-8: SC.D.1.3.1, SC.h.1.3.1, SC.H.1.3.2, SC.G.2.3.1 Grades 9-12: SC.D.1.4.2, SC.D.1.4.4, SC.D.2.4.1, SC.G.2.4.1 2 HELPFUL TIPS To complement activities in this kit, you might want to read about prehistory and fossils before you start.
    [Show full text]
  • A Palaeobiologist's Guide to 'Virtual' Micro-CT Preparation
    Palaeontologia Electronica palaeo-electronica.org A palaeobiologist’s guide to ‘virtual’ micro-CT preparation Richard Leslie Abel, Carolina Rettondini Laurini, and Martha Richter ABSTRACT This paper provides a brief but comprehensive guide to creating, preparing and dissecting a ‘virtual’ fossil, using a worked example to demonstrate some standard data processing techniques. Computed tomography (CT) is a 3D imaging modality for producing ‘virtual’ models of an object on a computer. In the last decade, CT technol- ogy has greatly improved, allowing bigger and denser objects to be scanned increas- ingly rapidly. The technique has now reached a stage where systems can facilitate large-scale, non-destructive comparative studies of extinct fossils and their living rela- tives. Consequently the main limiting factor in CT-based analyses is no longer scan- ning, but the hurdles of data processing (see disclaimer). The latter comprises the techniques required to convert a 3D CT volume (stack of digital slices) into a virtual image of the fossil that can be prepared (separated) from the matrix and ‘dissected’ into its anatomical parts. This technique can be applied to specimens or part of speci- mens embedded in the rock matrix that until now have been otherwise impossible to visualise. This paper presents a suggested workflow explaining the steps required, using as example a fossil tooth of Sphenacanthus hybodoides (Egerton), a shark from the Late Carboniferous of England. The original NHMUK copyrighted CT slice stack can be downloaded for practice of the described techniques, which include segmenta- tion, rendering, movie animation, stereo-anaglyphy, data storage and dissemination. Fragile, rare specimens and type materials in university and museum collections can therefore be virtually processed for a variety of purposes, including virtual loans, web- site illustrations, publications and digital collections.
    [Show full text]
  • NPS Museum Handbook, Part I Appendix U: Curatorial Care Of
    Appendix U: Curatorial Care of Paleontological and Geological Collections Page Section I: Paleontological Collections.....................................................................................................U:1 A. Overview............................................................................................................................................U:1 What information concerning paleontological collections will I find in this appendix? .......................U:1 Why is it important to practice preventive conservation with paleontological specimens?................U:1 How do I learn about preventive conservation?.................................................................................U:1 Where can I find the latest information on care of paleontological specimens? ................................U:2 B. Paleontological Collections and Fossils ......................................................................................U:2 What are paleontological collections?................................................................................................U:2 What is a fossil? .................................................................................................................................U:2 Are there other types of fossils?.........................................................................................................U:2 How can I identify the fossils in my collection? ..................................................................................U:3 C. Body Fossils ....................................................................................................................................U:3
    [Show full text]
  • Fossil Footnotes
    Fossil Footnotes Central Texas Paleontological Society March 2005 President’s Report FOSSIL of the MONTH Many of you have seen this before but it is worth Hi to all. Mercy this weather has been cold and showing again. It is a spectacular, perfectly nasty. I have been suffering with a bad cold as a preserved Cidarid sea urchin found by Mike result and am just now getting over it. I hope Smith a couple of years ago on a field trip to everyone else has made it through unscathed. Lake Travis hosted by Hal Hopkins. These are The one good thing, with all this rain, hopefully extremely rare and a once in a lifetime find. a lot of fossils will weather out for us to collect. Lower Cretaceous - Lower Glen Rose Formation We had a great February meeting with excellent attendance. A lot of new faces and new members attended which we were all very happy to see. Welcome to all of the new members. On a cool wet Saturday February the 19th four club members volunteered their time to man a table at the Austin Children’s Museum grand opening of there Dinosaur Expo. The four were Marcelle Spilker, David Lindberg, Mike Smith and Danny Harlow. There was excellent attendance and we all had a lot of fun showing the kids and parents Fossils of Texas. It will be open every Saturday on into the summer so go by a see it if you get a chance. See you at the March meeting! Danny March Meeting to be held on CTPS Minutes February 8, 2005 Tuesday, March 8, 2005 The meeting had a great turn out with several The March meeting will be at the LCRA new members.
    [Show full text]
  • Paleontological Skill and the Role of the Fossil Preparator
    Methods in Preparation Proceedings of the First Annual Fossil Preparation and Collections Symposium Edited by Matthew A. Brown, John F. Kane, and William G. Parker Petrified Forest, 2009 ISBN 1-11111-111-1 All Copyrights retained by individual authors ©2009 Cover design by Matthew Brown. Main image: A newly opened field jacket in the preparation lab. TABLE OF CONTENTS PREFACE v Matthew Brown and William Parker FOREWARD vi Gregory Brown ARTICLES PREPARATION IN ACTION: PALEONTOLOGICAL SKILL AND 3 THE ROLE OF THE FOSSIL PREPARATOR Caitlin Wylie WORKING FOSSIL LABORATORIES AS PUBLIC EXHIBITIONS 13 Annette Gavigan DINOSAURS, MUSEUMS, AND THE MODERNIZATION OF AMERICAN 21 FOSSIL PREPARATION AT THE TURN OF THE 20TH CENTURY Paul Brinkman FOSSIL PREPARATION TEST: AN INDICATION OF MANUAL SKILLS 35 Lisa Bergwall MICROPREPARATION: ONE SAND GRAIN AT A TIME 41 Jean Pierre Cavigelli AN INTRODUCTION TO SOLUTION AND REACTION 53 ADHESIVES FOR FOSSIL PREPARATION Amy Davidson and Samantha Alderson ROTTEN WOOD IN SAND: DIFFICULT PREPARATION OF A LARGE 63 THEROPOD Anthony Maltese HISTOLOGICAL CORE DRILLING: A LESS DESTRUCTIVE 69 METHOD FOR STUDYING BONE HISTOLOGY Koen Stein and Martin Sander CREATING A MULTI-USE POLYURETHANE MOLD WITH A 81 REPLACEABLE POUR SPOUT Michael Cherney THE USE OF LINEAR COLLAPSIBLE FOAM FOR MOLDING ICHNOFOSSILS 87 IN THE FIELD Thomas Nolan, Rob Atkinson, and Bryan Small INEXPENSIVE AND SIMPLE CONSTRUCTION OF A MANUAL 93 CENTRIFUGE FOR RESIN CASTING Daniel Erickson PACKING METHODS FOR DOMESTIC AND INTERNATIONAL 97 FOSSIL SHIPPING ReBecca
    [Show full text]
  • A Direct Association Between Amber and Dinosaur Remains Provides Paleoecological Insights Ryan C
    www.nature.com/scientificreports OPEN A direct association between amber and dinosaur remains provides paleoecological insights Ryan C. McKellar1,2,3*, Emma Jones4, Michael S. Engel 2, Ralf Tappert5, Alexander P. Wolfe6, Karlis Muehlenbachs 4, Pierre Cockx1,3, Eva B. Koppelhus6 & Philip J. Currie6 Hadrosaurian dinosaurs were abundant in the Late Cretaceous of North America, but their habitats remain poorly understood. Cretaceous amber is also relatively abundant, yet it is seldom found in direct stratigraphic association with dinosaur remains. Here we describe an unusually large amber specimen attached to a Prosaurolophus jaw, which reveals details of the contemporaneous paleoforest and entomofauna. Fourier-transform Infrared spectroscopy and stable isotope composition (H and C) suggest the amber formed from resins exuded by cupressaceous conifers occupying a coastal plain. An aphid within the amber belongs to Cretamyzidae, a Cretaceous family suggested to bark-feed on conifers. Distinct tooth row impressions on the amber match the hadrosaur’s alveolar bone ridges, providing some insight into the taphonomic processes that brought these remains together. Although dinosaur and resin fossils are abundant in the Late Cretaceous of western Canada, they are rarely associated, because conditions for their preservation difer. Tus, bone and amber records represent largely inde- pendent, albeit complementary, sources of information on diferent aspects of ancient ecosystems1. Despite the growing number of amber localities known in western Canada, insect-bearing amber in direct association with a dinosaur dig has only been reported once1–4. No fnds detail the circumstances by which amber and dinosaurs come together in bonebeds, and only a single study examines what one reveals about the paleoecology of the other1.
    [Show full text]
  • The July 2020 Issue
    http://www.wcgmc.org FACEBOOK link What are the concentric grains in my new sand? Can you see all 4? The large one is only 0.7mm in diameter (see page 4) How much water? See page 6 WCGMC PICNIC CANCELLED It is with much sadness that we must announce that the annual August picnic has been cancelled this year. Most of my articles for the WCGMC Newsletter over the past We are a large crowd (almost 100 last seven years have dealt with fossilized groups of animals, year) and we just do not see how proper their biostratigraphy and paleoecology. This article focuses social distancing could be maintained in on the preparation of fossils which are found in the Finger that environment. Factor in consideration Lakes Region of New York. I will describe some of the about potluck food service, renting a large equipment as well as some basic techniques I have learned tent, keeping a porta-potty safe, and during our isolation for the COVID pandemic. opening a busy workshop and we believe cancelling the event is the only prudent action we can take. Let’s be safe, limit our possible exposure and risk, and get through this. WCGMC has also not planned any field trips for the July-August time frame. However, the Rochester Academy of Science Fossil Section is planning a Saturday trip to multiple road cuts in the Syracuse area for July 18th, and we are invited to attend. For details on that day trip, see page 7. My fossil preparation “lab”: The air abrasive unit in front center For now, we expect to resume meetings holds the sample.
    [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]
  • ON the PURPORTED PRESENCE of FOSSILIZED COLLAGEN FIBRES in an ICHTHYOSAUR and a THEROPOD DINOSAUR by FIANN M
    [Palaeontology, Vol. 60, Part 3, 2017, pp. 409–422] ON THE PURPORTED PRESENCE OF FOSSILIZED COLLAGEN FIBRES IN AN ICHTHYOSAUR AND A THEROPOD DINOSAUR by FIANN M. SMITHWICK1 ,GERALDMAYR2 ,EVANT.SAITTA1 , MICHAEL J. BENTON1 and JAKOB VINTHER1,3 1School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, UK; [email protected] 2Ornithological Section, Senckenberg Research Institute and Natural History Museum, Senckenberganlage 25, Frankfurt, 60325, Germany 3School of Biological Sciences, University of Bristol, Bristol, BS8 1TQ, UK Typescript received 13 December 2016; accepted in revised form 3 March 2017 Abstract: Since the discovery of exceptionally preserved view, showing that integumentary structures have been mis- theropod dinosaurs with soft tissues in China in the 1990s, interpreted based on sedimentary features and preparation there has been much debate about the nature of filamen- marks, and that these errors have led to incorrect conclu- tous structures observed in some specimens. Sinosauropteryx sions being drawn about the existence of collagen in Sino- was the first non-avian theropod to be described with these sauropteryx and the ichthyosaur Stenopterygius. We find that structures, and remains one of the most studied examples. there is no evidence to support the idea that the integu- Despite a general consensus that the structures represent mentary structures seen in the two taxa are collagen fibres, feathers or feather homologues, a few identify them as and confirm that the most parsimonious interpretation of degraded collagen fibres derived from the skin. This latter fossilized structures that look like feather homologues in view has been based on observations of low-quality images Sinosauropteryx is that they are indeed the remains of of Sinosauropteryx, as well as the suggestion that because feather homologues.
    [Show full text]
  • Preparation of a Fossil Dinosaur
    Article: Preparation of a fossil dinosaur Author(s): Amy Davidson Source: Objects Specialty Group Postprints, Volume Ten, 2003 Pages: 49-61 Compilers: Virginia Greene, David Harvey, and Patricia Griffin th © 2004 by The American Institute for Conservation of Historic & Artistic Works, 1156 15 Street NW, Suite 320, Washington, DC 20005. (202) 452-9545 www.conservation-us.org Under a licensing agreement, individual authors retain copyright to their work and extend publications rights to the American Institute for Conservation. Objects Specialty Group Postprints is published annually by the Objects Specialty Group (OSG) of the American Institute for Conservation of Historic & Artistic Works (AIC). A membership benefit of the Objects Specialty Group, Objects Specialty Group Postprints is mainly comprised of papers presented at OSG sessions at AIC Annual Meetings and is intended to inform and educate conservation-related disciplines. Papers presented in Objects Specialty Group Postprints, Volume Ten, 2003 have been edited for clarity and content but have not undergone a formal process of peer review. This publication is primarily intended for the members of the Objects Specialty Group of the American Institute for Conservation of Historic & Artistic Works. Responsibility for the methods and materials described herein rests solely with the authors, whose articles should not be considered official statements of the OSG or the AIC. The OSG is an approved division of the AIC but does not necessarily represent the AIC policy or opinions. Odegaard\ Boyer, et al. AIC Objects Specialty Group Postprints, Volume Ten, 2003 PREPARATION OF A FOSSIL DINOSAUR Amy Davidson Introduction This paper is about an unusually well preserved, important and fragile fossil dinosaur, but it is also about a way to think about fossil preparation in general.
    [Show full text]