DOCSLIB.ORG

A Restudy of the Late Cambrian Molluscan Fauna of Berkey (1898) from Taylors Falls, Minnesota

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
A Restudy of the Late Cambrian Molluscan Fauna of Berkey (1898) from Taylors Falls, Minnesota MINNESOTA GEOLOGICAL SURVEY Harvey Thorleifson, Director A RESTUDY OF THE LATE CAMBRIAN MOLLUSCAN FAUNA OF BERKEY (1898) FROM TAYLORS FALLS, MINNESOTA Ellis L. Yochelson Gerald F. Webers National Museum of Natural History Macalester College Report of Investigations 64 ISSN 0076-9177 Saint Paul — 2006 A RESTUDY OF THE LATE CAMBRIAN MOLLUSCAN FAUNA OF BERKEY (1898) FROM TAYLORS FALLS, MINNESOTA This publication is accessible from the home page of the Minnesota Geological Survey (http://www.geo.umn.edu/mgs) as a PDF file readable with Acrobat Reader 5.0. Date of release: December, 2006 Recommended citation Yochelson, E.L., and Webers, G.F., 2006, A restudy of the Late Cambrian Molluscan fauna of Berkey (1898) from Taylors Falls, Minnesota: Minnesota Geological Survey Report of Investigations 64, 60 p. Minnesota Geological Survey 2642 University Avenue West Saint Paul, Minnesota 55114-1057 Telephone: 612-627-4780 Fax: 612-627-4778 E-mail address: [email protected] Web site: http://www.geo.umn.edu/mgs ©2006 by the Regents of the University of Minnesota All rights reserved. ISSN 0076-9177 The University of Minnesota is committed to the policy that all persons shall have equal access to its programs, facilities, and employment without regard to race, color, creed, religion, national origin, sex, age, marital status, disability, public assistance status, veteran status, or sexual orientation. CONTENTS page ABSTRACT .............................................................................................................................................1 INTRODUCTION ..................................................................................................................................1 STRATIGRAPHIC SETTING AND GEOLOGIC AGE .................................................................2 AVAILABLE MATERIAL AND SIGNIFICANCE ............................................................................5 PALEOECOLOGICAL SPECULATION ............................................................................................6 A BRIEF ESSAY ON THE CLASSIFICATION OF EARLY PALEOZOIC MOLLUSCA, AND PARTICULARLY GASTROPODA, IN NORTH AMERICA OVER ELEVEN DECADES ............................................................................................................................................7 Mollusca in the late nineteenth and early twentieth centuries .......................................8 The concept of Monoplacophora—to the mid-twentieth century ...................................9 The 1950s and the 1960s ...........................................................................................................10 The 1970s and the 1980s ...........................................................................................................11 The last decade of the twentieth century and the start of the twenty-first century .....13 MUSCLE SCARS AND ORIENTATION OF SPECIMENS ...........................................................16 THE CLASS GASTROPODA ..............................................................................................................18 THE CLASS TERGOMYA ....................................................................................................................18 A SURVEY OF EARLIER DESCRIBED NORTH AMERICAN LATE CAMBRIAN– EARLY ORDOVICIAN TERGOMYA SPECIES ..........................................................................22 SYSTEMATIC PALEONTOLOGY .....................................................................................................24 Class Gastropoda Cuvier .........................................................................................................24 Class Tergomya Horny .............................................................................................................28 Class ?Helcionelloidea ..............................................................................................................45 SUPPLEMENT TO SYSTEMATIC PALEONTOLOGY ..................................................................47 Class Gastropoda ......................................................................................................................47 STRATIGRAPHIC MATTERS ............................................................................................................48 SPECULATIVE MATTERS ..................................................................................................................49 Disparity and diversity ............................................................................................................49 Muscles and other presumed soft parts ................................................................................50 Symmetrical and asymmetrical shell forms ........................................................................51 Class-level evolution within the Mollusca ..........................................................................52 High-level evolution within the Mollusca ..........................................................................53 ACKNOWLEDGMENTS .....................................................................................................................53 REFERENCES .........................................................................................................................................54 APPENDIX ..............................................................................................................................................60 FIGURES Figure 1 Geologic map of the St. Croix River valley .......................................................................................... 2 Figure 2 Nomenclature .......................................................................................................................................... 3 Figure 3 Gastropoda and Tergomya ..................................................................................................................... 26 Figure 4 Tergomya .................................................................................................................................................. 30 iii Figure 5 Tergomya, ?Proplina convexum (Berkey) .............................................................................................33 Figure 6 Kirengella stabilis Berkey ........................................................................................................................35 Figure 7 Tergomya, ?Kirengella rectilateralus (Berkey) ......................................................................................36 Figure 8 Tergomya, Hypseloconus elongatus Berkey ..........................................................................................38 Figure 9 Tergomya, ?Hypseloconus cylindricus Berkey .....................................................................................43 Figure 10 ?Proteroconus capuloides (Berkey) .........................................................................................................44 Figure 11 New genus and ?"Cloudia" sp. ............................................................................................................46 NOTE ON MEASUREMENTS USED IN THIS REPORT Although the metric system is preferred in scientific writing, certain measurements are still routinely made in English customary units; for example, distances on land are measured in miles and depths in drill holes are measured in feet. Preference was given in this report to retaining the units in which measurements were made. To assist readers, conversion factors for some of the common units of measure are provided below. English units to metric units: To convert from to multiply by inch millimeter 25.40 inch centimeter 2.450 foot meter 0.3048 mile kilometer 1.6093 Metric units to English units: To convert from to multiply by millimeter inch 0.03937 centimeter inch 0.3937 meter foot 3.2808 kilometer mile 0.6214 iv A RESTUDY OF THE LATE CAMBRIAN MOLLUSCAN FAUNA OF BERKEY (1898) FROM TAYLORS FALLS, MINNESOTA Ellis L. Yochelson, deceased Gerald F. Webers, Macalester College, St. Paul, Minnesota ABSTRACT The molluscan fossils described and illustrated by C.P. Berkey from Upper Cambrian rocks at Taylors Falls, Minnesota, are redescribed and printed in this report. They comprise rare Gastropoda and relatively abundant and diverse Tergomya. The latter are supplemented by a few additional specimens collected decades ago. Palmer's reexamination of trilobite specimens collected by Berkey indicates an Elvinia age for the fauna. We conclude that the species differentiated by Berkey (1898) are mostly well founded. Berkey's study was significant because it documented the diversity of Mollusca in nearshore sandstones of Cambrian age. To place this nineteenth century paper in context, included herein is a summary of the changing views on evolution of portions of molluscan classification and a survey of some of the older-named, early Paleozoic, North American bilaterally symmetrical univalve species. INTRODUCTION He also included photographs of a few specimens. Although Berkey's effort of producing photographs When C.P. Berkey was a geology graduate student of fossils at that time is commendable, unfortunately at the University of Minnesota, he made a geologic they add little to the understanding of the taxa. His map, interpreted the topography and glacial geology, few general remarks in the text indicate a grasp and described the lithology of sedimentary and of the literature, and he had a clear concept of the igneous rocks he encountered
Load more

Recommended publications
  • Paleozoic Gastropoda from the Moose River Synclinorium, Northern Maine
    Paleozoic Gastropoda from the Moose River Synclinorium, Northern Maine GEOLOGICAL SURVEY PROFESSIONAL PAPER 503-A Paleozoic Gastropoda from the Moose River Synclinorium, Northern Maine By ARTJiUR J. BOUCOT and ELLIS L. YOCHELSON CONTRIBUTIONS TO PALEONTOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 503-A An investigation of fossils primarily of Devonian age UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1966 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402- Price 30 cents (paper cover) CONTENTS Page Page Abstract __________________________________________ _ A1 Register of localities ___________________________ -- __ _ A15 Introduction ______________________________________ _ 1 References cited __________________ ---- __ ------------ 17 Occurrence and distribution of the gastropods _________ _ 3 Index ____________________________________________ _ 19 Systematic paleontology ____________________________ _ 3 ILLUSTRATIONS [Plates follow index] PLATE 1. Gastropoda and miscellaneous fossils 2-3. Gastropoda Page FIGURE 1. Correlation table______________________ A2 2. Sketch of "Euomphalopterus" __ _ _ _ _ _ _ _ _ _ _ 17 TABLE Page TABLE 1. Distribution of gastropods in Paleozoic rocks of the Moose River synclinorium ________________ - ____ -- __ ------ A4 III CONTRIBUTIONS TO PALEONTOLOGY PALEOZOIC GASTROPODA FROM THE MOOSE RIVER SYNCLINORIUM, NORTHERN MAINE By ARTHUR J. BoucoT and ELLIS L. Y OCHELSON .ABSTRACT units which has been determined from study of other Large-scale collecting in the middle Paleozoic strata of the fossil groups (chiefly brachipods and corals). Moose River synclinorium has yielded a few gastropods-one Except where indicated, the taxonomic classification Ordovician species, six species from the Silurian, and two from follows that published by Knight, Batten, and Y ochel­ rocks of Silurian or Devonian age, one of these also oceurring son (1960).
    [Show full text]
  • Review of the Geology and Paleontology of the Ellsworth Mountains, Antarctica
    U.S. Geological Survey and The National Academies; USGS OF-2007-1047, Short Research Paper 107; doi:10.3133/of2007-1047.srp107 Review of the geology and paleontology of the Ellsworth Mountains, Antarctica G.F. Webers¹ and J.F. Splettstoesser² ¹Department of Geology, Macalester College, St. Paul, MN 55108, USA ([email protected]) ²P.O. Box 515, Waconia, MN 55387, USA ([email protected]) Abstract The geology of the Ellsworth Mountains has become known in detail only within the past 40-45 years, and the wealth of paleontologic information within the past 25 years. The mountains are an anomaly, structurally speaking, occurring at right angles to the Transantarctic Mountains, implying a crustal plate rotation to reach the present location. Paleontologic affinities with other parts of Gondwanaland are evident, with nearly 150 fossil species ranging in age from Early Cambrian to Permian, with the majority from the Heritage Range. Trilobites and mollusks comprise most of the fauna discovered and identified, including many new genera and species. A Glossopteris flora of Permian age provides a comparison with other Gondwana floras of similar age. The quartzitic rocks that form much of the Sentinel Range have been sculpted by glacial erosion into spectacular alpine topography, resulting in eight of the highest peaks in Antarctica. Citation: Webers, G.F., and J.F. Splettstoesser (2007), Review of the geology and paleontology of the Ellsworth Mountains, Antarctica, in Antarctica: A Keystone in a Changing World – Online Proceedings of the 10th ISAES, edited by A.K. Cooper and C.R. Raymond et al., USGS Open- File Report 2007-1047, Short Research Paper 107, 5 p.; doi:10.3133/of2007-1047.srp107 Introduction The Ellsworth Mountains are located in West Antarctica (Figure 1) with dimensions of approximately 350 km long and 80 km wide.
    [Show full text]
  • Life Cycle and Early Development of the Thecosomatous Pteropod Limacina Retroversa in the Gulf of Maine, Including the Effect of Elevated CO2 Levels
    Life cycle and early development of the thecosomatous pteropod Limacina retroversa in the Gulf of Maine, including the effect of elevated CO2 levels Ali A. Thabetab, Amy E. Maasac*, Gareth L. Lawsona and Ann M. Tarranta a. Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 b. Zoology Dept., Faculty of Science, Al-Azhar University in Assiut, Assiut, Egypt. c. Bermuda Institute of Ocean Sciences, St. George’s GE01, Bermuda *Corresponding Author, equal contribution with lead author Email: [email protected] Phone: 441-297-1880 x131 Keywords: mollusc, ocean acidification, calcification, mortality, developmental delay Abstract Thecosome pteropods are pelagic molluscs with aragonitic shells. They are considered to be especially vulnerable among plankton to ocean acidification (OA), but to recognize changes due to anthropogenic forcing a baseline understanding of their life history is needed. In the present study, adult Limacina retroversa were collected on five cruises from multiple sites in the Gulf of Maine (between 42° 22.1’–42° 0.0’ N and 69° 42.6’–70° 15.4’ W; water depths of ca. 45–260 m) from October 2013−November 2014. They were maintained in the laboratory under continuous light at 8° C. There was evidence of year-round reproduction and an individual life span in the laboratory of 6 months. Eggs laid in captivity were observed throughout development. Hatching occurred after 3 days, the veliger stage was reached after 6−7 days, and metamorphosis to the juvenile stage was after ~ 1 month. Reproductive individuals were first observed after 3 months. Calcein staining of embryos revealed calcium storage beginning in the late gastrula stage.
    [Show full text]
  • The Paleoecology and Biogeography of Ordovician Edrioasteroids
    University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 8-2011 The Paleoecology and Biogeography of Ordovician Edrioasteroids Rene Anne Lewis University of Tennessee - Knoxville, [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Paleontology Commons Recommended Citation Lewis, Rene Anne, "The Paleoecology and Biogeography of Ordovician Edrioasteroids. " PhD diss., University of Tennessee, 2011. https://trace.tennessee.edu/utk_graddiss/1094 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Rene Anne Lewis entitled "The Paleoecology and Biogeography of Ordovician Edrioasteroids." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, with a major in Geology. Michael L. McKinney, Major Professor We have read this dissertation and recommend its acceptance: Colin D. Sumrall, Linda C. Kah, Arthur C. Echternacht Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) THE PALEOECOLOGY AND BIOGEOGRAPHY OF ORDOVICIAN EDRIOASTEROIDS A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville René Anne Lewis August 2011 Copyright © 2011 by René Anne Lewis All rights reserved.
    [Show full text]
  • 2015 Annual Report of a Comprehensive Assessment of Marine Mammal, Marine Turtle, and Seabird Abundance and Spatial Distribution
    2015 Annual Report of a Comprehensive Assessment of Marine Mammal, Marine Turtle, and Seabird Abundance and Spatial Distribution in US Waters of the Western North Atlantic Ocean – AMAPPS II Short-beaked common dolphin (Delphinus delphis) Collected under MMPA Research permit #775-1875 Photo credit: NOAA/NEFSC/Allison Henry Northeast Fisheries Science Center 166 Water St. Woods Hole, MA 02543 Southeast Fisheries Science Center 75 Virginia Beach Dr. Miami, FL 33149 2015 Annual Report to A Comprehensive Assessment of Marine Mammal, Marine Turtle, and Seabird Abundance and Spatial Distribution in US Waters of the western North Atlantic Ocean – AMAPPS II Table of Contents BACKGROUND ........................................................................................................................... 3 SUMMARY OF 2015 ACTIVITIES ........................................................................................... 3 Appendix A: Northern leg of aerial abundance survey during December 2014 – January 2015: Northeast Fisheries Science Center .............................................................................................. 11 Appendix B: Southern leg of aerial abundance survey during January - March 2015: Southeast Fisheries Science Center ............................................................................................................... 21 Appendix C: Gray seal live capture, biological sampling, and tagging on Monomoy National Wildlife Refuge and Muskeget Island, January 2015: Northeast Fisheries Science Center
    [Show full text]
  • Trilobites of the Hagastrand Member (Tøyen Formation, Lowermost Arenig) from the Oslo Region, Norway. Part Il: Remaining Non-Asaphid Groups
    Trilobites of the Hagastrand Member (Tøyen Formation, lowermost Arenig) from the Oslo Region, Norway. Part Il: Remaining non-asaphid groups OLE A. HOEL Hoel, O. A.: Trilobites of the Hagastrand Member (Tøyen Formation, lowermost Arenig) from the Oslo Region, Norway. Part Il: remaining non-asaphid groups. Norsk Geologisk Tidsskrift, Vol. 79, pp. 259-280. Oslo 1999. ISSN 0029-196X. This is Part Il of a two-part description of the trilobite fauna of the Hagastrand Member (Tøyen Formation) in the Oslo, Eiker­ Sandsvær, Modum and Mjøsa areas. In this part, the non-asaphid trilobites are described, while the asaphid species have been described previously. The history and status of the Tremadoc-Arenig Boundary problem is also reviewed, and I have found no reason to insert a Hunnebergian Series between the Tremadoc and the Arenig series, as has been suggested by some workers. Descriptions of the localities yielding this special trilobite fauna are provided. Most of the 22 trilobite species found in the Hagastrand Member also occur in Sweden. The 12 non-asaphid trilobites described herein belong to the families Metagnostidae, Shumardiidae, Remopleurididae, Nileidae, Cyclopygidae, Raphiophoridae, Alsataspididae and Pliomeridae. One new species is described; Robergiella tjemviki n. sp. Ole A. Hoel, Paleontologisk Museum, Sars gate l, N-0562 Oslo, Norway. Introduction contemporaneous platform deposits in Sweden are domi­ nated by a condensed limestone succession. In Norway, the The Tremadoc-Arenig Boundary interval is a crucial point Tøyen Formation is divided into two members: the lower in the evolution of several invertebrate groups, especially among the graptolites and the trilobites. In the graptolites, this change consisted most significantly in the loss of bithekae and a strong increase in diversity.
    [Show full text]
  • Monoplacophoran Limpet
    16 McLean: Monoplacophoran Limpet FIGURES 17-21. Neopilinid radular ribbons, magnifications adjusted to show a similar number of teeth rows. FIGURE 17, Vema (Vema) ewingi. intact ribbon with teeth aligned (LACM 65-11, 6200 m. 110 mi. W of Callao. Pern. R/V ANTON BRUUN, 24 November 1965). FIGURE 18, Vema (Vema) ewingi. another portion of same ribbon with lateral teeth turned to the side. FIGURE 19. Neopilina veleronis. intact ribbon of paratype, teeth not aligned (AHF 603, 2730-2769 m, 30 mi. W of Natividad Island. Baja California, Mexico). FIGURE 20, Vema (Laevipilina) hyalina new species, intact ribbon with teeth aligned, focused on shafts of lateral teeth (LACM 19148). FIGURE 21, Vema (Laevipilina) hyalina, same ribbon, focused on fringe of first marginal teeth. instead of the highly reduced condition in these two species. Al- small-sized species have similar teeth. Radular differences among though the first lateral of N. veleronis is somewhat larger than it the species examined are quantitative rather than qualitative, sup- is in the other two species, that of V. hyalina is still the larger. porting placement of the four species in the same family. A study The fringed first marginal of V. hyalina is much broader than in of the radulae of the other three living species of neopilinids N. veleronis. Only in V. hyalina is the fringed tooth so broad that should reveal further specific differences. it overlaps the opposite member in the central part of the ribbon. The radula of neopilinid monoplacophorans is very similar to The second and third laterals of V.
    [Show full text]
  • Shell Microstructures in Early Cambrian Molluscs
    Shell microstructures in Early Cambrian molluscs ARTEM KOUCHINSKY Kouchinsky, A. 2000. Shell microstructures in Early Cambrian molluscs. - Acta Palaeontologica Polonica 45,2, 119-150. The affinities of a considerable part of the earliest skeletal fossils are problematical, but investigation of their microstructures may be useful for understanding biomineralization mechanisms in early metazoans and helpful for their taxonomy. The skeletons of Early Cambrian mollusc-like organisms increased by marginal secretion of new growth lamel- lae or sclerites, the recognized basal elements of which were fibers of apparently aragon- ite. The juvenile part of some composite shells consisted of needle-like sclerites; the adult part was built of hollow leaf-like sclerites. A layer of mineralized prism-like units (low aragonitic prisms or flattened spherulites) surrounded by an organic matrix possibly existed in most of the shells with continuous walls. The distribution of initial points of the prism-like units on a periostracurn-like sheet and their growth rate were mostly regular. The units may be replicated on the surface of internal molds as shallow concave poly- gons, which may contain a more or less well-expressed tubercle in their center. Tubercles are often not enclosed in concave polygons and may co-occur with other types of tex- tures. Convex polygons seem to have resulted from decalcification of prism-like units. They do not co-occur with tubercles. The latter are interpreted as casts of pore channels in the wall possibly playing a role in biomineralization or pits serving as attachment sites of groups of mantle cells. Casts of fibers and/or lamellar units may overlap a polygonal tex- ture or occur without it.
    [Show full text]
  • Western North Greenland (Laurentia)
    BULLETIN OF THE GEOLOGICAL SOCIETY OF DENMARK · VOL. 69 · 2021 Trilobite fauna of the Telt Bugt Formation (Cambrian Series 2–Miaolingian Series), western North Greenland (Laurentia) JOHN S. PEEL Peel, J.S. 2021. Trilobite fauna of the Telt Bugt Formation (Cambrian Series 2–Mi- aolingian Series), western North Greenland (Laurentia). Bulletin of the Geological Society of Denmark, Vol. 69, pp. 1–33. ISSN 2245-7070. https://doi.org/10.37570/bgsd-2021-69-01 Trilobites dominantly of middle Cambrian (Miaolingian Series, Wuliuan Stage) Geological Society of Denmark age are described from the Telt Bugt Formation of Daugaard-Jensen Land, western https://2dgf.dk North Greenland (Laurentia), which is a correlative of the Cape Wood Formation of Inglefield Land and Ellesmere Island, Nunavut. Four biozones are recognised in Received 6 July 2020 Daugaard-Jensen Land, representing the Delamaran and Topazan regional stages Accepted in revised form of the western USA. The basal Plagiura–Poliella Biozone, with Mexicella cf. robusta, 16 December 2020 Kochiella, Fieldaspis? and Plagiura?, straddles the Cambrian Series 2–Miaolingian Series Published online 20 January 2021 boundary. It is overlain by the Mexicella mexicana Biozone, recognised for the first time in Greenland, with rare specimens of Caborcella arrojosensis. The Glossopleura walcotti © 2021 the authors. Re-use of material is Biozone, with Glossopleura, Clavaspidella and Polypleuraspis, dominates the succes- permitted, provided this work is cited. sion in eastern Daugaard-Jensen Land but is seemingly not represented in the type Creative Commons License CC BY: section in western outcrops, likely reflecting the drastic thinning of the formation https://creativecommons.org/licenses/by/4.0/ towards the north-west.
    [Show full text]
  • Constraints on the Timescale of Animal Evolutionary History
    Palaeontologia Electronica palaeo-electronica.org Constraints on the timescale of animal evolutionary history Michael J. Benton, Philip C.J. Donoghue, Robert J. Asher, Matt Friedman, Thomas J. Near, and Jakob Vinther ABSTRACT Dating the tree of life is a core endeavor in evolutionary biology. Rates of evolution are fundamental to nearly every evolutionary model and process. Rates need dates. There is much debate on the most appropriate and reasonable ways in which to date the tree of life, and recent work has highlighted some confusions and complexities that can be avoided. Whether phylogenetic trees are dated after they have been estab- lished, or as part of the process of tree finding, practitioners need to know which cali- brations to use. We emphasize the importance of identifying crown (not stem) fossils, levels of confidence in their attribution to the crown, current chronostratigraphic preci- sion, the primacy of the host geological formation and asymmetric confidence intervals. Here we present calibrations for 88 key nodes across the phylogeny of animals, rang- ing from the root of Metazoa to the last common ancestor of Homo sapiens. Close attention to detail is constantly required: for example, the classic bird-mammal date (base of crown Amniota) has often been given as 310-315 Ma; the 2014 international time scale indicates a minimum age of 318 Ma. Michael J. Benton. School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, U.K. [email protected] Philip C.J. Donoghue. School of Earth Sciences, University of Bristol, Bristol, BS8 1RJ, U.K. [email protected] Robert J.
    [Show full text]
  • Homeomorphic Gastropods from the Silurian of Norway, Estonia and Bohemia
    Homeomorphic gastropods from the Silurian of Norway, Estonia and Bohemia MARE ISAKAR, JAN OVE R. EBBESTAD & JOHN S. PEEL Isakar, M,. Ebbestad, J. O. R. & Peel, J. S.: Homeomorphic gastropods from the Silurian of Norway, Estonia and Bohemia. Norsk Geologisk Tidsskrift, Vol. 79, pp. 281-288. Oslo 1999. ISSN 0029-196X. Redescription of the gastropodEuomphalus undiferus Schmidt, 1858 fromthe Upper Llandovery Rumba Formation of Estonia requires reinvestigation of the hitherto monotypic genus Kiaeromphalus Peel & Y ochelson, 1976, originally described from the Rytteråker Formation of the Oslo Region. The Estonian K. undiferus and the Norwegian type species occur in similar depositional facies of Early Silurian age within the sedgwickii Graptolite Zone. The redescribed type specimen of Horologium kokeni Perner, 1907 from the late Silurian (Ludlow) of Bohemia shows strong morphological convergence with the two Baltic species, but Kiaeromphalus is distinguished by its lower rate of whorl expansion and less oblique aperture. Both genera were adapted to a sessile life, possibly on a soft substratum. Mare lsakar, Museum ofGeology, University ofTartu, Vanemuise 46, 51014 Tartu, Estonia. E-mail: [email protected]; Jan OveR. Ebbestad & JohnS. Peel, Department of Earth Sciences (Historical Geology and Palaeontology), Uppsala University, Norbyviigen 22, S-752 36 Uppsala, Sweden. E-mail: [email protected]; [email protected]. Introduction morphic, genera; Schmidt's (1858) species from Estonia is ascribed to the latter genus. Thus, Kiaeromphalus occurs In 1976, Peel & Yochelson reviewed Early Silurian from southem Norway to Estonia in the Lower Silurian (Llandovery) gastropods from the Oslo Region and rocks, although it remains unreported from the Silurian of proposed two new genera, Kiaeromphalus and Kjerulfo­ Sweden.
    [Show full text]
  • Type and Figured Fossils in the Worthen Collection at the Illinois
    s Cq&JI ^XXKUJtJLI 14oGS: CIR 524 c, 2 TYPE AND FIGURED FOSSILS IN THE WORTHEN COLLECTION AT THE ILLINOIS STATE GEOLOGICAL SURVEY Lois S. Kent GEOLOGICAL ILLINOIS Illinois Department of Energy and Natural Resources, STATE GEOLOGICAL SURVEY DIVISION CIRCULAR 524 1982 COVER: This portrait of Amos Henry Worthen is from a print presented to me by Worthen's great-grandson, Arthur C. Brookley, Jr., at the time he visited the Illinois State Geological Survey in the late 1950s or early 1960s. The picture is the same as that published in connection with the memorial to Worthen in the appendix to Vol. 8 of the Geological Survey of Illinois, 1890. -LSK Kent, Lois S., Type and figured fossils in the Worthen Collection at the Illinois State Geological Survey. — Champaign, III. : Illinois State Geological Survey, 1982. - 65 p. ; 28 cm. (Circular / Illinois State Geological Survey ; 524) 1. Paleontology. 2. Catalogs and collections. 3. Worthen Collection. I. Title. II. Series. Editor: Mary Clockner Cover: Sandra Stecyk Printed by the authority of the State of Illinois/1982/2500 II I IHOI'.MAII '.I 'II Of.ir.AI MIHVI y '> 300 1 00003 5216 TYPE AND FIGURED FOSSILS IN THE WORTHEN COLLECTION AT THE ILLINOIS STATE GEOLOGICAL SURVEY Lois S. Kent | CIRCULAR 524 1982 ILLINOIS STATE GEOLOGICAL SURVEY Robert E. Bergstrom, Acting Chief Natural Resources Building, 615 East Peabody Drive, Champaign, IL 61820 TYPE AND FIGURED FOSSILS IN THE WORTHEN COLLECTION AT THE ILLINOIS STATE GEOLOGICAL SURVEY CONTENTS Acknowledgments 2 Introduction 2 Organization of the catalog 7 Notes 8 References 8 Fossil catalog 13 ABSTRACT This catalog lists all type and figured specimens of fossils in the part of the "Worthen Collection" now housed at the Illinois State Geological Survey in Champaign, Illinois.
    [Show full text]