DOCSLIB.ORG

20Ccffr1.Pdf

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
20Ccffr1.Pdf CONTRIB UTIONS FROM THE CUSHMAN FOUKDA'.rI ON FOR FORAMINIFERAL RESEARCH 1 CONTRIBUTIONS FROM THE CUSHMAN FOUNDATION FOR FORAMINIFERAL RESEARCH VOLUM E XX, PART 1, JANUARY, 1969 360. ASTRATlGRAPHIC SEQUENCE OF BENTHONIC SMALLER FORAMINIFERA FROM THE LA BOCA FORMATlON, PANAMA CANAL ZONE* GUSTAVO BLACUTl AND R. M. KLEINPELL2 INTRODUCTION (see text fi g. 2), and upward through some twenty The siltstones, mudstones, and dark clay of the feet of section, the La Boca is especially rich in La Boca Formation, early middle Tertiary of the Siphogell erilla transversa and other species of Panama Canal Zone, have long held more than smaller foraminifers. Benthonic foraminifers oc­ ord inary interest for students of American middle cur also below the Emperador Limestone Member, Tertiary foraminifers. The type locality of SipllO- about fifteen feet above the contact between the ell erilla trallsversa Cushman is in the La Boca La Boca and the underlying Las Cascadas Agglom­ 'ormation. Geographicall y widespread, this species erate, and also hi gher, about two hundred fift y feet curs stratigraphically near the horizons of sup­ above the base of the La Boca in outcrop. They posed boundary between the Oligocene and Mio· are also well developed through almost another two :ene Series. It also appears to be ancestral to sev­ hundred feet of beds stratigraphically still hi gher eral other stratigraphically significant species of in the La Boca, in the samples from the core hole iphogell erina in the Miocene of both the Atlantic mentioned, drilled about a thousand feet west of Seaboard and the Pacific Coast Ranges farther north. the outcrops (see text fig. 2). Originally recorded as in the Culebra Formation In 1965, a suite of nineteen foraminiferal sam­ oi the Canal Zone (Cushman 1918a, p. 41), the ples from this La Boca sequence, collected by W. strata at the type locality of S. trallsversa have sub­ P. Woodring from the outcrops and provided from sequently been assigned to the La Boca Formation. the cored subsurface sequence through the coop­ In turn the La Boca, once considered a marine eration of R. H. Stewart of the Panama Canal ember of the Panama Formation (Woodring Company, was sent to Gustavo Blacut in Califor­ I 57, p. 41 ; Cole 1964, p. 140 ) has subsequently nia for comparison with stratigraphic sequences been given formation rank (Woodring 1964, p. bearing Siphogell erina trallsversa in the West Coast . -I-t) . The locality in reference, U .S.G .S . no. 6010 Ranges. At th at time Blacut was working toward locality 130 of Woodring 1957, pI. 2, locality 9 of an M.A. degree at the University of California in Cole loc. cit.) "in dark cl ay," is about one-half Berkeley. By the summer of 1966 he was well ·Ie northwest of Pedro Miguel in the Panama along in his work on the La Boca foraminifers and Canal3 (see text fig . I). It was in the canal exca­ had launched his field work in California when ti on. There are no natural exposures nearby, suddenly leukemia brought to a tragic close this nothing is known about the stratigraphic po­ young man's promising career. iUion of this locality 6010 within the La Boca Blacut's type specimens, faunal slides, and notes Formation. At a locality about six miles north­ have been assembled by the junior author under t of Pedro Miguel, made available in 1965 as whose guidance his academic program had been result of widening of the Panama Canal in Gail­ conducted. The type specimens have been illus­ Cut, Siphogell erilla transversa was again found trated by Mary Taylor and the illustrations (Plates abundance. Here, on the west side of Las Cas­ 1·6) prepared for publication by Gordon Horna­ .:adas Reach, fresh exposures of the La Boca For­ day of the Museum of Paleontology at Berkeley . tion yielded a sequence of foraminiferal assem­ Although Bl acut's work in the Coast Ranges had ges from the base of the formation through a only begun, in view of the several published rec­ _. Kness of 250 feet (see text fig. 1 for the locality ords of the Coast Range fossil faunas with which - this measured foraminiferal sequence). An ad­ Siphogell erina trails versa is associated there it has . nal thickness of 195 feet was sam pled in cores been possible to place his study of the Panama ma­ ::-om a nearby core hole. From a stratigraphic terial within the context of these published Coast JlXizon about one hundred feet above the top of Range records and thus in part at least to put on Emperador Limestone Member of the La Boca record the substance of the study he was not granted time to complete. conlribution from the Museum of Paleontology, U n i- _",it,. of California. Berkeley. ACKNOWLEDGMENTS ::"""ased. Several people have in one way or another _ Jl::seum of Paleonlology, UniversityofCalifomia, Bel'keley. helped bring Bl acut's work through to posthumous N BO' 79· 4 5' 79D 30' I "' ~ ~ I I ~~ ~ ~ ,~ ~ '<­ u 9' 9' 15' 15' to t' ;.- () c:: ";.- Z 0 ~ t' ~ Z '1l t'l t' 'llf ;.- Z ;.- ~ 9' 1 ;.- () ;.- Z ;.- ~~" t' -- ~ '"0 Z ~~ '" t'l "l ~ 0 L a Chorrero <? :0 ;.- o S 10 Mlle. I ! , ~ ~ Z ~ "l l'J :0 TEXT FIGURE 1. LOCALITY MAP ;.. CONTRIBUTIONS FROM THE CUSHMAN FOU NDAT ION FOR FORAlIUNIFERAL RESEARCH 3 DEPTH B DEPTH IN FEET IN fEET OF SAMPLES O--,r-----..., Rtsidual clat, lilt, and sand - .. _ ... - ..- . ..._ -.... -.. _ .... _ ... "'-" ' - 39 ..' -" -_' .. --.-. '" 50 _ •.-=' .-.':=-'_'_' .-:=. .=.= '_': _" .. ...... - -"." ...._- -..._ ...--" ... --... 59 ...__ --" _.­ . ...... - ... ...-- --.. ..-- , - ..... : ',--=-:":.. ,---_ :~. ... ..... - -.......... -_ _- .. .. 85 :~.-.-.-. 98 100 .. -_.. -- ..... -_--... .. ••.__ ~-!..!: • • • .__ ... _- ... '-..-".-- '--'.. 118 ..._.-- -- .. ,-_... _-.. ._-.. .-_ .. ... --:-;-:--'-'.'.=- 136 .... - --...... - - .. 150 .. - .. ._ . .. ....... -- • -;-;-;... :..:..:..... _-,,;- - .... I S 9 . __...... -_ - ..... .._ _-.. .... -- -_.... '--... --..." ..__'-'". _ .. 177 THICKNESS A "-"... _-'-".. SAMPLES '-"'--" 192 IN FEET ......_. --... ..... .. 250 ; ':'.:_: }--410-10 200 __".-." ..._ __ :=,,_:.::::,::.:. ...... _ - .. ... .._ '-:-:-:- ....:..:..:..-..-. - .. "--"'--.. --.. - ' .--... - " . ~:o. · : :a,~':' '; : . :~.. ~~.~.~. i~~.~.~. ~~-----------~~~.~: ~~:~~~ .~.~·.~· ~.. ~·~ .. L L.pidocyclina mirof/ortJns/s ..~.....::~...... :-:- .._....... ...._...... : . 200 .. - ... _ .. 250 ..._.... ......- ... ... .. .. - ...... - -- .... _... .. - ............... .... -_...... __ ... -- ...... ... 262.8-.L.;..· ;,.' ;,.' ;,.. ,;,..,;,..;,..=,;,. ' ". _ " _' - "'-" · - '- ' ', :-:-=':'': .. "'.- -"..... --.- ' - .... '". .. -... _... -... .. ' E:~~~~~~~.. ~:~.- .~_-o~~· ·~:~. 1J~~:g:~ 150 ~_.. ;-. -=_..... 410-7 ~~~~ :...._. _=. .. - :.-:=" ...::".-'.=. -",'..0="1:::::::410- 410-56 410- 4 ~ ~ t=::=:3 ~ ·. -._._._...... _" _:-::.= ..:r- ...... siltstone lilty cloy and calcariOUS --:...-._--- ... _-- ..---. sandstone mudstone Ilitstoni ... _ ... - ... .... .. ' , ~ . [23• .• • ..0· ., 100 "· :-==.:..::-:-- " '--=.:....-:-:- '" .' . -":.~' . '. l lmlltone oQOlomerott oggk)mlrofic vitric tuff •. • • --:-:7.:..:..:...-:7':... ..• , • luff .._ - ..-. _... · - ' .: :-:-=:..:.- '., , ' - . • ; :':'=-:": ' 50 . ' . ~~~ .. 50 75FEET " - "'--'" EmPlrador I I - } Limestone Mlmber 410-1 ---=--------=--=----- o ----- 0 0 a odD: 0 0 o5S)o Q ••• O.·.~AoQ-o LAS CASCADAS AGGLOMERATE Sections of La Boca Formation on west side of Los Cascadas Reach, Panama Conal. A. Outcrop section opposite Canal station 1622 . Measured by W. P. Woodring. B. Core hole LBW 149, 1,000 feet west of outcrop section . Logged by R. H. Stewart. TEXT FIGURE 2. COLUMNAR SECTION 4 BLAC CT A N D KLI~I;\,PELL-PANAl\1A CAN AL ZONE FORA1\UNll'-" ERA presentation. Thanks are especially due W. P. -about here in the column-in small numbers. Woodring of the U. S. National Muse um who col­ The balance of the higher La Boca beds bear fora­ lected the outcrop samples, contributed the field minifers of small size for their respective species data from Panama, and provided the map and and faunules that are notable for their content of columnar sections; R. H . Stewart, through whose sharp-peripheried non ion ids, finely costate uviger­ cooperation the core samples were made available; inids, small robulids, cassidulinids and anomalinids, Miss Ruth Todd and K. Norman Sachs, Jr., of the and some globigerinids. These higher La Boca U. S. Geological Survey, for pertinent commentary faunules appear to be of more nearly shallow shelf­ on more or less associated planktonic and larger sea depositional origin, but lived in waters still foraminifera from the La Boca, respectively; Zach connected at the surface with the open ocean. M. Arnold, editor for the Cushman Foundation; Thus, except for its lowermost hundred feet or D. E. Savage, Gordon Hornaday and Mary Taylor, so of beds which were deposited in shallow water of the Museum of Paleontology, University of protected from open-ocean currents, the La Boca California, Berkeley; and the Museum of Paleon­ Formation on the west side of Las Cascadas Reach tology for financial assistance. would appear to have been deposited under normal THE FORAMINIFERA marine conditions at medium depths: for a time The smaller foraminifers and their di stribution somewhat beyond the edge of the continental shelf in the surface and subsurface sections of the La but subsequently above those depths, on the shelf Boca Formation on the west side of Las Cascadas itself though still in waters connected with the Reach, Panama Canal, are shown in text fig. 3. open ocean. More than sixty species or varieties of benthonic foraminifers
Load more

Recommended publications
  • Tetrapod Biostratigraphy and Biochronology of the Triassic–Jurassic Transition on the Southern Colorado Plateau, USA
    Palaeogeography, Palaeoclimatology, Palaeoecology 244 (2007) 242–256 www.elsevier.com/locate/palaeo Tetrapod biostratigraphy and biochronology of the Triassic–Jurassic transition on the southern Colorado Plateau, USA Spencer G. Lucas a,⁎, Lawrence H. Tanner b a New Mexico Museum of Natural History, 1801 Mountain Rd. N.W., Albuquerque, NM 87104-1375, USA b Department of Biology, Le Moyne College, 1419 Salt Springs Road, Syracuse, NY 13214, USA Received 15 March 2006; accepted 20 June 2006 Abstract Nonmarine fluvial, eolian and lacustrine strata of the Chinle and Glen Canyon groups on the southern Colorado Plateau preserve tetrapod body fossils and footprints that are one of the world's most extensive tetrapod fossil records across the Triassic– Jurassic boundary. We organize these tetrapod fossils into five, time-successive biostratigraphic assemblages (in ascending order, Owl Rock, Rock Point, Dinosaur Canyon, Whitmore Point and Kayenta) that we assign to the (ascending order) Revueltian, Apachean, Wassonian and Dawan land-vertebrate faunachrons (LVF). In doing so, we redefine the Wassonian and the Dawan LVFs. The Apachean–Wassonian boundary approximates the Triassic–Jurassic boundary. This tetrapod biostratigraphy and biochronology of the Triassic–Jurassic transition on the southern Colorado Plateau confirms that crurotarsan extinction closely corresponds to the end of the Triassic, and that a dramatic increase in dinosaur diversity, abundance and body size preceded the end of the Triassic. © 2006 Elsevier B.V. All rights reserved. Keywords: Triassic–Jurassic boundary; Colorado Plateau; Chinle Group; Glen Canyon Group; Tetrapod 1. Introduction 190 Ma. On the southern Colorado Plateau, the Triassic– Jurassic transition was a time of significant changes in the The Four Corners (common boundary of Utah, composition of the terrestrial vertebrate (tetrapod) fauna.
    [Show full text]
  • Pterosaur Distribution in Time and Space: an Atlas 61
    Zitteliana An International Journal of Palaeontology and Geobiology Series B/Reihe B Abhandlungen der Bayerischen Staatssammlung für Pa lä on to lo gie und Geologie B28 DAVID W. E. HONE & ERIC BUFFETAUT (Eds) Flugsaurier: pterosaur papers in honour of Peter Wellnhofer CONTENTS/INHALT Dedication 3 PETER WELLNHOFER A short history of pterosaur research 7 KEVIN PADIAN Were pterosaur ancestors bipedal or quadrupedal?: Morphometric, functional, and phylogenetic considerations 21 DAVID W. E. HONE & MICHAEL J. BENTON Contrasting supertree and total-evidence methods: the origin of the pterosaurs 35 PAUL M. BARRETT, RICHARD J. BUTLER, NICHOLAS P. EDWARDS & ANDREW R. MILNER Pterosaur distribution in time and space: an atlas 61 LORNA STEEL The palaeohistology of pterosaur bone: an overview 109 S. CHRISTOPHER BENNETT Morphological evolution of the wing of pterosaurs: myology and function 127 MARK P. WITTON A new approach to determining pterosaur body mass and its implications for pterosaur fl ight 143 MICHAEL B. HABIB Comparative evidence for quadrupedal launch in pterosaurs 159 ROSS A. ELGIN, CARLOS A. GRAU, COLIN PALMER, DAVID W. E. HONE, DOUGLAS GREENWELL & MICHAEL J. BENTON Aerodynamic characters of the cranial crest in Pteranodon 167 DAVID M. MARTILL & MARK P. WITTON Catastrophic failure in a pterosaur skull from the Cretaceous Santana Formation of Brazil 175 MARTIN LOCKLEY, JERALD D. HARRIS & LAURA MITCHELL A global overview of pterosaur ichnology: tracksite distribution in space and time 185 DAVID M. UNWIN & D. CHARLES DEEMING Pterosaur eggshell structure and its implications for pterosaur reproductive biology 199 DAVID M. MARTILL, MARK P. WITTON & ANDREW GALE Possible azhdarchoid pterosaur remains from the Coniacian (Late Cretaceous) of England 209 TAISSA RODRIGUES & ALEXANDER W.
    [Show full text]
  • Table of Contents 4.0 Description of the Physical
    TABLE OF CONTENTS 4.0 DESCRIPTION OF THE PHYSICAL ENVIRONMENT............................................ 4­1 4.1 Geology ................................................................................................. 4­1 4.1.1 Methodology ........................................................................................ 4­1 4.1.2 Regional Geological Formations........................................................... 4­2 4.1.3 Local Geological Units ......................................................................... 4­7 4.1.3.1 Atlantic Coast .......................................................................... 4­7 4.1.3.2 Gatun Locks.............................................................................. 4­8 4.1.3.3 Gatun Lake ............................................................................... 4­9 4.1.3.4 Culebra Cut ......................................................................... ...4­10 4.1.3.5 Pacific Locks ...........................................................................4­11 4.1.3.6 Pacific Coast............................................................................4­12 4.1.4 Paleontological Resources ...................................................................4­13 4.1.5 Geotechnical Characterization .............................................................4­17 4.1.6 Tectonics.............................................................................................4­21 4.2 Geomorphology ..............................................................................................4­22
    [Show full text]
  • Gondwana Vertebrate Faunas of India: Their Diversity and Intercontinental Relationships
    438 Article 438 by Saswati Bandyopadhyay1* and Sanghamitra Ray2 Gondwana Vertebrate Faunas of India: Their Diversity and Intercontinental Relationships 1Geological Studies Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata 700108, India; email: [email protected] 2Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721302, India; email: [email protected] *Corresponding author (Received : 23/12/2018; Revised accepted : 11/09/2019) https://doi.org/10.18814/epiiugs/2020/020028 The twelve Gondwanan stratigraphic horizons of many extant lineages, producing highly diverse terrestrial vertebrates India have yielded varied vertebrate fossils. The oldest in the vacant niches created throughout the world due to the end- Permian extinction event. Diapsids diversified rapidly by the Middle fossil record is the Endothiodon-dominated multitaxic Triassic in to many communities of continental tetrapods, whereas Kundaram fauna, which correlates the Kundaram the non-mammalian synapsids became a minor components for the Formation with several other coeval Late Permian remainder of the Mesozoic Era. The Gondwana basins of peninsular horizons of South Africa, Zambia, Tanzania, India (Fig. 1A) aptly exemplify the diverse vertebrate faunas found Mozambique, Malawi, Madagascar and Brazil. The from the Late Palaeozoic and Mesozoic. During the last few decades much emphasis was given on explorations and excavations of Permian-Triassic transition in India is marked by vertebrate fossils in these basins which have yielded many new fossil distinct taxonomic shift and faunal characteristics and vertebrates, significant both in numbers and diversity of genera, and represented by small-sized holdover fauna of the providing information on their taphonomy, taxonomy, phylogeny, Early Triassic Panchet and Kamthi fauna.
    [Show full text]
  • Final Copy 2019 10 01 Herrera
    This electronic thesis or dissertation has been downloaded from Explore Bristol Research, http://research-information.bristol.ac.uk Author: Herrera Flores, Jorge Alfredo A Title: The macroevolution and macroecology of Mesozoic lepidosaurs General rights Access to the thesis is subject to the Creative Commons Attribution - NonCommercial-No Derivatives 4.0 International Public License. A copy of this may be found at https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode This license sets out your rights and the restrictions that apply to your access to the thesis so it is important you read this before proceeding. Take down policy Some pages of this thesis may have been removed for copyright restrictions prior to having it been deposited in Explore Bristol Research. However, if you have discovered material within the thesis that you consider to be unlawful e.g. breaches of copyright (either yours or that of a third party) or any other law, including but not limited to those relating to patent, trademark, confidentiality, data protection, obscenity, defamation, libel, then please contact [email protected] and include the following information in your message: •Your contact details •Bibliographic details for the item, including a URL •An outline nature of the complaint Your claim will be investigated and, where appropriate, the item in question will be removed from public view as soon as possible. This electronic thesis or dissertation has been downloaded from Explore Bristol Research, http://research-information.bristol.ac.uk Author: Herrera Flores, Jorge Alfredo A Title: The macroevolution and macroecology of Mesozoic lepidosaurs General rights Access to the thesis is subject to the Creative Commons Attribution - NonCommercial-No Derivatives 4.0 International Public License.
    [Show full text]
  • Paleocene–Eocene Palynomorphs from the Chicxulub Impact Crater, Mexico
    Palynology ISSN: 0191-6122 (Print) 1558-9188 (Online) Journal homepage: https://www.tandfonline.com/loi/tpal20 Paleocene–Eocene palynomorphs from the Chicxulub impact crater, Mexico. Part 2: angiosperm pollen Vann Smith, Sophie Warny, David M. Jarzen, Thomas Demchuk, Vivi Vajda & Sean P.S. Gulick To cite this article: Vann Smith, Sophie Warny, David M. Jarzen, Thomas Demchuk, Vivi Vajda & Sean P.S. Gulick (2020): Paleocene–Eocene palynomorphs from the Chicxulub impact crater, Mexico. Part 2: angiosperm pollen, Palynology, DOI: 10.1080/01916122.2019.1705417 To link to this article: https://doi.org/10.1080/01916122.2019.1705417 View supplementary material Accepted author version posted online: 17 Dec 2019. Published online: 23 Jan 2020. Submit your article to this journal Article views: 55 View related articles View Crossmark data Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tpal20 PALYNOLOGY https://doi.org/10.1080/01916122.2019.1705417 Paleocene–Eocene palynomorphs from the Chicxulub impact crater, Mexico. Part 2: angiosperm pollen Vann Smitha,b , Sophie Warnya,b, David M. Jarzenc, Thomas Demchuka, Vivi Vajdad and Sean P.S. Gulicke aDepartment of Geology and Geophysics, LSU, Baton Rouge, LA, USA; bMuseum of Natural Science, LSU, Baton Rouge, LA, USA; cCleveland Museum of Natural History, Cleveland, OH, USA; dSwedish Museum of Natural History, Stockholm, Sweden; eInstitute for Geophysics and Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, TX, USA ABSTRACT KEYWORDS At the end of the Cretaceous Period, an asteroid collided with the Earth and formed the Chicxulub Mexico; Paleocene; impact structure on the Yucatan Platform.
    [Show full text]
  • First North American Fossil Monkey and Early Miocene Tropical Biotic Interchange Jonathan I
    LETTER doi:10.1038/nature17415 First North American fossil monkey and early Miocene tropical biotic interchange Jonathan I. Bloch1, Emily D. Woodruff1,2, Aaron R. Wood1,3, Aldo F. Rincon1,4, Arianna R. Harrington1,2,5, Gary S. Morgan6, David A. Foster4, Camilo Montes7, Carlos A. Jaramillo8, Nathan A. Jud1, Douglas S. Jones1 & Bruce J. MacFadden1 New World monkeys (platyrrhines) are a diverse part of modern Primates Linnaeus, 1758 tropical ecosystems in North and South America, yet their early Anthropoidea Mivart, 1864 evolutionary history in the tropics is largely unknown. Molecular Platyrrhini Geoffroy, 1812 divergence estimates suggest that primates arrived in tropical Cebidae Bonaparte, 1831 Central America, the southern-most extent of the North American Panamacebus transitus gen. et sp. nov. landmass, with several dispersals from South America starting with the emergence of the Isthmus of Panama 3–4 million years Etymology. Generic name combines ‘Panama’ with ‘Cebus’, root taxon ago (Ma)1. The complete absence of primate fossils from Central for Cebidae. Specific name ‘transit’ (Latin, crossing) refers to its implied America has, however, limited our understanding of their history early Miocene dispersal between South and North America. in the New World. Here we present the first description of a fossil Holotype. UF 280128, left upper first molar (M1; Fig. 2a, b). monkey recovered from the North American landmass, the oldest Referred material. Left upper second molar (M2; UF 281001; Fig. 2a, b), known crown platyrrhine, from a precisely dated 20.9-Ma layer in partial left lower first incisor (I1; UF 280130), right lower second the Las Cascadas Formation in the Panama Canal Basin, Panama.
    [Show full text]
  • Neogene Basin Evolution in the Southwestern Dominican Republic: a Foraminiferal Study
    Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1989 Neogene Basin Evolution in the Southwestern Dominican Republic: A Foraminiferal Study. Peter Paul Mclaughlin Jr Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Mclaughlin, Peter Paul Jr, "Neogene Basin Evolution in the Southwestern Dominican Republic: A Foraminiferal Study." (1989). LSU Historical Dissertations and Theses. 4734. https://digitalcommons.lsu.edu/gradschool_disstheses/4734 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. For more information, please contact [email protected]. INFORMATION TO USERS The most advanced technology has been used to photo­ graph and reproduce this manuscript from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer. The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. Oversize materials (e.g., maps, drawings, charts) are re­ produced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps.
    [Show full text]
  • Curriculum Vitae – Richard Alan Ketcham
    CURRICULUM VITAE – RICHARD ALAN KETCHAM Associate Professor Office: (512) 471-6942 Department of Geological Sciences, C1100 Home: (512) 419-7438 The University of Texas Fax: (512) 471-9425 Austin, TX 78712-1101 email: [email protected] August 23, 2014 BORN: July 2, 1965; Norwalk, Connecticut EDUCATION: Ph.D., Geological Sciences, May 1995 University of Texas, Austin, TX B.A., Geology and Computer Science, May 1987 Williams College, Williamstown, MA ACTIVE RESEARCH INTERESTS: Use of high-resolution X-ray computed tomography (CT) for geological applications. Application of computational modeling and analysis techniques to geological problems, both theoretical and field-oriented Theory and practice of apatite fission-track and other methods of low-temperature thermochronology, including thermal history inversion Quantitative textural analysis of porphyroblast crystallization in metamorphic rocks, and modeling of diffusion-controlled crystallization textures. Characterization of thermal structure and heat source distribution in the continental crust through both field-based and modeling approaches HONORS AND AWARDS: 2014 Faculty Science Performance Award for an Associate Professor, Department of Geological Sciences 2013 Exceptional Reviewer, Review of Scientific Instruments 2012 Exceptional Reviewer, GSA Bulletin 2010-2011 G. Moses and Catherine G. Knebel Distinguished Teaching Award, Department of Geological Sciences 2010 GSA Fellow 2007-2009 Jackson School of Geosciences Research Excellence Fellow 2006-2007 Jackson School of Geosciences
    [Show full text]
  • @Flmnh.Ufl.Edu Panama Isthmus Rise at 4.2-3.5 Ma
    Panama isthmus rise at 4.2-3.5 Ma @flmnh.ufl.edu Thermohaline Circulation Orange=warm shallow waters Blue=cold deep waters Broecker et al 1987; Lozier 2010 NHG at 2.7 Ma Artic glaciation, Gulf Stream BIRTH OF CARIBBEAN SEA Caribbean non-seasonal nutrient-poor high-carbonates (corals) Pacific Seasonality rich in nutrients low carbonates (few corals) GABI Pacific Caribbean CA SA 3.5Ma Classic “Panamanian Isthmus Rise” Literature (more than 1800 citations over past 30 years) Title Author/Publication Total citations Total citations Date (Web of Knowledge) (Google Scholar) The geology of the Darien, Panama, and the late Miocene- Pliocene collision of the Panama Arc with northwestern South America Coates et al., 2004 84 100 Early Neogene history of the Central American arc from Bocas del Toro, western Panama Coates et al., 2003 43 41 Effect of the formation of the Isthmus of Panama on Atlantic Ocean thermohaline circulation Haugh, 1998 356 408 The geologic evolution of the Central American isthmus Coates & Obando, 1996 - 460 Closure of the Isthmus of Panamá: The near-shore marine record of Costa Rica and western Panama Coates et al., 1992 - 306 The Choco Block in the Northwestern corner of South America: structural, tectonostratigraphic and paleogeographic implications Duque, 1990 - 78 Neogene stratigraphy, paleoceanography and paleobiogeography in northwest South America and evolution of the Pama Seaway Duque, 1990 181 217 The great American biotic interchange Stehli & Webb, 1985 - 258 Splendid Isolation: The Curious History of South American Mammals Simpson, 1983 - 366 Pliocene closing of the Isthmus of Panama, based on biostratigraphic evidence from nearby Pacific Ocean and Caribbean Sea cores Lloyd, 1978 - 222 “no vicariant date [3.5 Ma] is better dated than the Isthmus (Lessios et al 2008)” @Ziegler photos by C.
    [Show full text]
  • Structural Development of the Peregrina–Huizachal Anticlinorium, Mexico
    Journal of Structural Geology 28 (2006) 494–507 www.elsevier.com/locate/jsg Structural development of the Peregrina–Huizachal anticlinorium, Mexico Y. Zhou *, M.A. Murphy, A. Hamade Department of Geosciences, University of Houston, Houston, TX 77204, USA Received 21 March 2005; received in revised form 5 November 2005; accepted 17 November 2005 Available online 25 January 2006 Abstract The Sierra Madre Oriental fold belt is a NW–SE-trending contractional belt that spans nearly the entire length of Mexico. This area underwent Triassic–Middle Jurassic rifting and Late Cretaceous–Early Cenozoic shortening. Our structural investigation of the Peregrina–Huizachal anticlinorium in east central Mexico shows that its development is characterized by two phases of deformation: an early thin-skinned phase and a late thick-skinned phase. A detachment developed at the contact between the rift sedimentary rock and overlying limestone. During the thin- skinned phase, deformation of the Upper Jurassic–Cretaceous strata is accommodated by a series of detachment folds and faults. The rift boundary faults are sub-perpendicular to the late stage compression in east central Mexico. This makes rift-related faults prone to be inverted as reverse faults. During the thick-skinned phase, the basement in the rift is uplifted along two opposing reverse faults and experience internal deformation. Its uplift contributed to the growth of the Peregrina–Huizachal anticlinorium. q 2006 Elsevier Ltd. All rights reserved. Keywords: Detachment; Anticlinorium; Basement reactivation; Red beds 1. Introduction The geometry and timing of basement-involved structures are not clear. Some studies have interpreted the basement to be The Sierra Madre Oriental (SMO) fold–thrust belt stretches bounded by Laramide-style high-angle reverse faults, postdat- nearly 1500 km from northern to southern Mexico.
    [Show full text]
  • A New Sphenodontian (Lepidosauria: Rhynchocephalia)
    View metadata, citation and similar papersDownloaded at core.ac.uk from http://rspb.royalsocietypublishing.org/ on February 13, 2017 brought to you by CORE provided by CONICET Digital A new sphenodontian (Lepidosauria: Rhynchocephalia) from the Late Triassic of Argentina and the early origin of the herbivore opisthodontians rspb.royalsocietypublishing.org Ricardo N. Martı´nez1, Cecilia Apaldetti1,2, Carina E. Colombi1,2, Angel Praderio1, Eliana Fernandez1,2, Paula Santi Malnis1,2, 1,2 1 1 Research Gustavo A. Correa , Diego Abelin and Oscar Alcober 1Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, Avenida Espan˜a 400 Norte, Cite this article: Martı´nez RN, Apaldetti C, 5400 San Juan, Argentina Colombi CE, Praderio A, Fernandez E, Malnis 2Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas, CONICET, Buenos Aires, Argentina PS, Correa GA, Abelin D, Alcober O. 2013 A new sphenodontian (Lepidosauria: Rhyncho- Sphenodontians were a successful group of rhynchocephalian reptiles that dominated the fossil record of Lepidosauria during the Triassic and Jurassic. cephalia) from the Late Triassic of Argentina Although evidence of extinction is seen at the end of the Laurasian Early and the early origin of the herbivore Cretaceous, they appeared to remain numerically abundant in South America opisthodontians. Proc R Soc B 280: 20132057. until the end of the period. Most of the known Late Cretaceous record in http://dx.doi.org/10.1098/rspb.2013.2057 South America is composed of opisthodontians, the herbivorous branch of Sphenodontia, whose oldest members were until recently reported to be from the Kimmeridgian–Tithonian (Late Jurassic). Here, we report a new sphenodontian, Sphenotitan leyesi gen.
    [Show full text]