Colonial Geology and Mineral Resources
Total Page:16
File Type:pdf, Size:1020Kb

Load more
Recommended publications
-
Towards a Phylogenetic Classification of the Cretaceous Ammonites V
N.Jb. Geo\. Palaont. Abh. Stuttgart, Januar 1997 Towards a phylogenetic classification of the Cretaceous ammonites V. Euomphaloceratidae By M. R. Cooper, Durban With 5 figures in the text COOPER, M. R. (1997): Towards a phylogenetic classification of the Cretaceous ammo nites. V. Euomphaloceratidae. - N. Jb. Geo\. Palaont., Abh., 203: 1-21; Stuttgart. Abstract: Phylogenetic analysis of Euomphaloceratinae COOPER, 1978, a group within highly diversified and heterogeneous Acanthocerataceae, indicates a fundamental dichotomy which suggests promotion of this taxon to family rank with recognition of two subfamilies. Nominate Euomphaloceratinae comprise E. (Euomphaloceras), E. (Kanabiceras), Burroceras, Paraburroceras, P. (Pseudaspidoceras), P. (Ampakabites), and Morrowites, and Romaniceratinae subfam. nov. is made up of Schindewo/fites, Kameruno ceras, Codazziceras, Proromaniceras (Proromaniceras), P. (Obiraceras), Neomphaloceras, Yubariceras and Romaniceras (?with Shuparoceras as a subgenus). Zusammenfassung: Die phylogenetische Analyse der Euomphaloceratinae COOPER, 1978, einer Gruppe der hoch diversifizierten und heterogenen Acanthocerataceae, weist auf eine fundamentale Dichotomie innerhalb der Unterfamilie hin. Der Gruppe wird daher Familienrang verliehen und zwei Unterfamilien abgegrenzt. Die Nominat-Unter familie Euomphaloceratinae umfaBt E. (Euomphaloceras), E. (Kanabiceras), Burroceras, Paraburroceras, P. (Pseudaspidoceras), P. (Ampakabites) und Morrowites. Zur zweiten Unterfamilie Romaniceratinae subfam. nov. gehiiren Schindewo/fites, -
Phylogeny, Diversity, and Ecology of the Ammonoid Superfamily Acanthoceratoidea Through the Cenomanian and Turonian
PHYLOGENY, DIVERSITY, AND ECOLOGY OF THE AMMONOID SUPERFAMILY ACANTHOCERATOIDEA THROUGH THE CENOMANIAN AND TURONIAN DAVID A.A. MERTZ A Thesis Submitted to the Graduate College of Bowling Green State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 2017 Committee: Margaret Yacobucci, Advisor Andrew Gregory Keith Mann © 2017 David Mertz All Rights Reserved iii ABSTRACT Margaret Yacobucci Both increased extinction and decreased origination, caused by rising oceanic anoxia and decreased provincialism, respectively, have been proposed as the cause of the Cenomanian Turonian (C/T) extinction event for ammonoids. Conflicting evidence exists for whether diversity actually dropped across the C/T. This study used the ammonoid superfamily Acanthoceratoidea as a proxy for ammonoids as a whole, particularly focusing on genera found in the Western Interior Seaway (WIS) of North America, including Texas. Ultimately, this study set out to determine 1) whether standing diversity decreased across the C/T boundary in the WIS, 2) whether decreased speciation or increased extinction in ammonoids led to a drop in diversity in the C/T extinction event, 3) how ecology of acanthoceratoid genera changed in relation to the C/T extinction event, and 4) whether these ecological changes indicate rising anoxia as the cause of the extinction. In answering these questions, three phylogenetic analyses were run that recovered the families Acanthoceratidae, Collignoniceratidae, and Vascoceratidae. Pseudotissotiidae was not recovered at all, while Coilopoceratidae was recovered but reclassified as a subfamily of Vascoceratidae. Seven genera were reclassified into new families and one genus into a new subfamily. After calibrating the trees with stratigraphy, I was able to determine that standing diversity dropped modestly across the C/T boundary and the Early/Middle Turonian boundary. -
CHAPTER I I I Sistematic DESCRIPTION
CHAPTER III SiSTEMATIC DESCRIPTION CIUPTER III systematic description Section I : Mortonlceratinae Introduction : The ammonoid species described by Stoliczka under the group of Ammonites crlstatl were sub divided by him into species 1, Ammonites blanfordianus, 2, Ammonites inflatus, condollianus. ootatoorensis and corruptus, 3, Amnionites propinquus. 4. Ammonites obesus, 5. Ammonites se rratocarlnatus. 6, Ammonite s subtricarinatus. These were transferred by later workers e.g. Kossmat to Schloenbachia and its subgenera as : Schloenbachla (Tropitoldes) . S. (Prlnotropis) . S. (Peroniceras). S, (Munerlceras) etc. According to present ideas the above mentioned species have undergone further transfers and except those of the Inflata group, are placed under different subfamilies, viz. Peroniceratlnae, Mune rice rat inae, etc. These species are, therefore, not considered under the present section; but those of the Inflata group which are now found to belong to the sub family Mortonlceratinae are dealt with here. The species which represent this subfamily in the present collection, viz. Mortoniceras (Mortoniceras) inflatum (Sow.); M. (M.) rostratum (Sow.), Mortonioeras (Peiradoceras) indicum spo nov., M. (Purnovarites) perinflatum Spath., M. (p.) - 17 - - 18 - subquadratum Spath, M. (d .) sp. Indet; ?Mortonicera8 (?Mortoniceras) deshpandel sp, nov., Prohysteroceras (Goodhallltes) stoliczkal sp. nov. are dealt with here., Of these eight species Mortonlceras (Mortonlceras) inflatum was described by Stoliczka and Kossmat from these rocks. Three species viz. Mortoniceras (M.) rostratum (Sow.), M. (Durnovarites) perlnflatum Spath., M. (D .) subquadratum Spath. are species already known and are recorded from outside South Indian basin; they are now recorded here for the first time. The remaining species described here are new to science. The subfamily Mortoniceratinae has an interesting history, being used in the first instance by Spath (1925) to comprise species of texanum group of Senonian. -
Sucesión De Amonitas Del Cretácico Superior (Cenomaniano – Coniaciano) De La Parte Más Alta De La Formación Hondita Y De L
Boletín de Geología Vol. 33, N° 1, enero-junio de 2011 SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDITA Y DE LA FORMACIÓN LOMA GORDA EN LA QUEBRADA BAMBUCÁ, AIPE - HUILA (COLOMBIA, S. A.) Pedro Patarroyo1 RESUMEN La sección de la quebrada Bambucá (Aipe - Huila) posee una buena exposición de los depósitos del Cretácico del Valle Superior del Magdalena. De la parte alta de la Formación Hondita se recolectaron Acanthoceras sp. y Rhynchostreon sp. del Cenomaniano superior. Dentro del segmento inferior de la Formación Loma Gorda se hallaron Choffaticeras (C.) cf. segne, Fagesia cf. catinus, Neoptychites cf. andinus, Mitonia gracilis, Morrowites sp., Nannovascoceras ? sp., Quitmaniceras ? sp., Benueites ? sp. junto con Mytiloides kossmati, M. goppelnensis y Anomia sp. del Turoniano inferior. Estratigráficamente arriba aparecen Paramammites ? sp., Hoplitoides sp. H. ingens, H. cf. lagiraldae, Codazziceras ospinae, Allocrioceras sp., que pueden estar representando entre el Turoniano inferior y medio. Para la parte alta de este segmento se encontraron Prionocycloceras sp. P. guayabanum, Reesidites subtuberculatum, Subprionotropis colombianus, Mytiloides scupini, Dydimotis sp., Gauthiericeras sp., Anagaudryceras ? sp., Eulophoceras jacobi, Paralenticeras sieversi, Hauericeras cf. madagascarensis, Peroniceras (P.) subtricarinatum, Forresteria (F.) sp., Barroisiceras cf. onilahyense, Ankinatsytes venezolanus que abarcan entre el Turoniano superior y el Coniaciano. Con base en la fauna colectada no es posible establecer los límites Cenomaniano/Turoniano y Turoniano/Coniaciano. Palabras clave: Amonitas, Cretácico superior, Valle Superior del Magdalena, Aipe-Huila-Colombia. UPPER CRETACEOUS AMMONITE SUCCESSION (CENOMANIAN – CONIACIAN) RELATED TO THE UPPER HONDITA AND LOMA GORDA FORMATIONS ALONG THE BAMBUCÁ CREEK, AIPE - HUILA (COLOMBIA, S.A.) ABSTRACT The Bambucá creek section (Aipe - Huila) shows a very good exposition of the Upper Magdalena Valley Cretaceous deposits. -
Mid-Cretaceous Ammonite Sequence for Western New Mexico Iv
iii Contents ABSTRACT 5 Genus Morrowites Cobban and Hook, n. gen. 9 Morrowites wingi (Morrow) 9 INTRODUCTION 5 M. depressus (Powell) 11 COMPOSITION OF MOLLUSCAN FAUNA 5 M. subdepressus Cobban and Hook, n. sp. 11 OCCURRENCE AND PRESERVATION OF FOSSILS 6 M. cf. M. dixeyi (Reyment) 12 STRATIGRAPHIC POSITION OF FOSSILS 6 Subfamily Euomphaloceratinae Cooper 13 COLLECTION LOCALITIES 7 Genus Kamerunoceras Reyment 13 Kamerunoceras turoniense (d'Orbigny) 13 FAMILY VASCOCERATIDAE H. Douvillé 14 SYSTEMATIC PALEONTOLOGY 7 Subfamily Vascoceratinae H. Douvillé 14 FAMILY BACULITIDAE GILL 7 Genus Neoptychites Kossmat 14 Genus Baculites Lamarck 7 Neoptychites cephalotus (Courtiller) 14 Baculites yokoyamai Tokunaga and Shimizu 7 Genus Fagesia Pervinquière 15 FAMILY MUNIERICERATIDAE WRIGHT 7 Fagesia superstes (Kossmat) 16 Genus Tragodesmoceras Spath 7 FAMILY C OLLIGNONICERATIDAE WRIGHT AND WRIGHT 16 Tragodesmoceras socorroense Cobban and Hook 7 Subfamily Barroisiceratinae Basse 16 FAMILY PLACENTICERATIDAE HYATT 8 Genus Cibolaites Cobban and Hook, n. gen. 16 Genus Placenticeras Spath 8 Cibolaites molenaari Cobban and Hook, n. sp. 16 Placenticeras cumminsi Cragin 8 REFERENCES 18 FAMILY ACANTHOCERATIDAE DE GROSSOUVRE 8 Subfamily Mammitinae Hyatt 8 Genus Mammites PLATES 1-14 21 Laube and Bruder 8 INDEX 50 Mammites nodosoides (Schluter) 8 TABLE 1—Mid-Cretaceous ammonite sequence for western New Mexico iv FIGURES 1—Location of study area 5 9—Histogram of size and body chambers of Neoptychites 2—External sutures of Mammites nodosoides (Schluter) 9 3— cephalotus (Courtiller) 14 Whorl sections of Morrowites wingi (Morrow) 10 4—External 10—Scatter diagram of breadth to diameter ratio of Neop- suture of Morrowites wingi (Morrow) 10 5—Whorl section and tychites 14 suture of Morrowites depressus 11—External sutures of Neoptychites cephalotus (Cour-tiller) 15 (Powell) 11 12—External suture of Fagesia superstes (Kossmat) 16 13— 6—External sutures of Morrowites subdepressus Cobban and Histogram of size of body chambers of Cibolaites molenaari Hook, n. -
Rediscovery of the Holotypes of the Cenomanian (Upper Cretaceous) Ammonites Vascoceras Gamai Choffat, 1898, and Vascoceras Barcoicense (Choffat, 1898)
Cretaceous Research 56 (2015) 647e650 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes Short communication Rediscovery of the holotypes of the Cenomanian (Upper Cretaceous) ammonites Vascoceras gamai Choffat, 1898, and Vascoceras barcoicense (Choffat, 1898) * Fernando Barroso-Barcenilla a, b, , Jose Manuel Brandao~ c, Pedro Miguel Callapez d, e, Vanda Faria dos Santos e, f a Grupo de Investigacion IberCreta, Departamento de Geología y Geografía, Facultad de Ciencias, Universidad de Alcala de Henares, 28871 Alcalade Henares, Spain b Grupo de Investigacion Procesos Bioticos Mesozoicos, Departamento de Paleontología, Facultad de Ciencias Geologicas, Universidad Complutense de Madrid, 28040 Madrid, Spain c Instituto de Historia Contemporanea,^ Centro de Estudos de Historia e FilosofiadaCi^encia, Universidade de Evora, 7000-554 Evora, Portugal d Departamento de Ci^encias da Terra, Faculdade de Ci^encias e Tecnologia, Universidade de Coimbra, 3030-790 Coimbra, Portugal e Centro de Investigaçao~ da Terra e do Espaço, Universidade de Coimbra, 3000-134 Coimbra, Portugal f Museu Nacional de Historia Natural e da Ci^encia, Universidade de Lisboa, 1250-102 Lisboa, Portugal article info abstract Article history: The historical holotypes of the Cenomanian (Upper Cretaceous) ammonites Vascoceras gamai Choffat, Received 23 January 2015 1898 (type of the genus), and Vascoceras barcoicense (Choffat, 1898), thought to be destroyed by the fire of Received in revised form March 1978 at the National Museum of Natural History, Lisbon, Portugal, have been rediscovered in good 10 June 2015 state of preservation. Based on the study of the originals, these upper Cenomanian specimens can be Accepted in revised form 27 June 2015 rehabilitated as holotypes, maintaining and justifying the status of both taxa as well as of Vascoceras Available online 30 July 2015 cauvini Chudeau, 1909. -
Redalyc.SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDIT
Boletín de Geología ISSN: 0120-0283 [email protected] Universidad Industrial de Santander Colombia Patarroyo, Pedro SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDITA Y DE LA FORMACIÓN LOMA GORDA EN LA QUEBRADA BAMBUCÁ, AIPE - HUILA (COLOMBIA, S. A.) Boletín de Geología, vol. 33, núm. 1, enero-junio, 2011, pp. 69-92 Universidad Industrial de Santander Bucaramanga, Colombia Disponible en: http://www.redalyc.org/articulo.oa?id=349632022005 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Boletín de Geología Vol. 33, N° 1, enero-junio de 2011 SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDITA Y DE LA FORMACIÓN LOMA GORDA EN LA QUEBRADA BAMBUCÁ, AIPE - HUILA (COLOMBIA, S. A.) Pedro Patarroyo1 RESUMEN La sección de la quebrada Bambucá (Aipe - Huila) posee una buena exposición de los depósitos del Cretácico del Valle Superior del Magdalena. De la parte alta de la Formación Hondita se recolectaron Acanthoceras sp. y Rhynchostreon sp. del Cenomaniano superior. Dentro del segmento inferior de la Formación Loma Gorda se hallaron Choffaticeras (C.) cf. segne, Fagesia cf. catinus, Neoptychites cf. andinus, Mitonia gracilis, Morrowites sp., Nannovascoceras ? sp., Quitmaniceras ? sp., Benueites ? sp. junto con Mytiloides kossmati, M. goppelnensis y Anomia sp. del Turoniano inferior. Estratigráficamente arriba aparecen Paramammites ? sp., Hoplitoides sp. -
Redalyc. SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDI
Boletín de Geología ISSN: 0120-0283 [email protected] Universidad Industrial de Santander Colombia Patarroyo, Pedro SUCESIÓN DE AMONITAS DEL CRETÁCICO SUPERIOR (CENOMANIANO – CONIACIANO) DE LA PARTE MÁS ALTA DE LA FORMACIÓN HONDITA Y DE LA FORMACIÓN LOMA GORDA EN LA QUEBRADA BAMBUCÁ, AIPE - HUILA (COLOMBIA, S. A.) Boletín de Geología, vol. 33, núm. 1, enero-junio, 2011, pp. 69-92 Universidad Industrial de Santander Bucaramanga, Colombia Available in: http://www.redalyc.org/articulo.oa?id=349632022005 Abstract The Bambucá creek section (Aipe - Huila) shows a very good exposition of the Upper Magdalena Valley Cretaceous deposits. To the upper part of the Hondita Formation were recollected Acanthoceras sp. and Rhynchostreon sp. of the upper Cenomanian. Related to the lower segment of the Loma Gorda Formation were found Choffaticeras ( C .) cf. segne , Fagesia cf. catinus , Neoptychites cf. andinus , Mitonia gracilis , Morrowites sp., Nannovascoceras ? sp., Quitmaniceras ? sp., Benueites ? sp., Paramammites ? sp. togheter with Mytiloides kossmati , M . goppelnensis and Anomia sp. of the lower Turonian. Following by Hoplitoides sp. H . ingens , H . cf. lagiraldae , Codazziceras ospinae , Allocrioceras sp. that can be representing between the lower and middle Turonian. To the upper part of this segment were collected Prionocycloceras sp. P . guayabanum , Reesidites subtuberculatum , Subprionotropis colombianus , Mytiloides scupini , Dydimotis sp., Gauthiericeras sp., Anagaudryceras ? sp., Eulophoceras jacobi , Paralenticeras sieversi , Hauericeras -
The Turonian Stage and Substage Boundaries by Peter BENGTSON (Compiler) with Contributions by William A
BULLETIN DE L'INSTITUT ROYAL DES SCIENCES NATURELLES DE BELGIQUE SCIENCES DE LA TERRE, 66-SUPP.: 69-79, 1996 BULLETIN VAN HET KONINKLIJK BELGISCH INSTITUUT VOOR NATUURWETENSCHAPPEN AARDWETENSCHAPPEN, 66-SUPP.: 69-79. 1996 The Turonian stage and substage boundaries by Peter BENGTSON (compiler) with contributions by William A. Cobban, Paul Dodsworth, Andrew S. Gale, William James Kennedy, Marcos A. Lamolda, Tatsuro Matsumoto, Richard A. Reyment, Ekbert Seibertz and Karl-Armin Tröger. «golden spike») abb CeHOMaHO-TypoHCKOÏi rpaHHLtbl flonxeH Abstract öbiTb onpeflenëH b pa3pe3e Rock Canyon Anticline, Ha 3anane Pueblo, Konopaflo, CLUA, b ocHOBaHUM Gnoa 86, Formai définitions of the Cenomanian-Turonian and lower-middle coBnaflaioiuero c nepBbiM noHB/ieHHeM aMMOHHTa Turonian are boundaries proposed, following discussions at the Second watinoceras devonense (wright & kennedy, 1981). B International Symposium on Cretaceous Stage Boundaries, held in KanecTBe gssp ahh HUXHe-cpeAHeü TypoHcxoft rpaHHLtbl Brussels, 8-16 September 1995. The Global boundary Stratotype Sec¬ 6bi.no npeanoxteHO nepBoe noHBneHHe aMMOHHTa tion and Point (GSSP, "golden spike") for the Cenomanian-Turonian Collignonoceras woollgari (mantell, 1822) Toro xce boundary should be placed at the base of Bed 86 in a section at Rock pa3pe3a(CnoPi 120). Hto KacaeTca cpeAHe-Bepxnero Canyon Anticline, west of Pueblo, Colorado, USA, coincident with the TypoHa, to Ha AaHHbiü MOMeHT npeftnoxmb KaKoü-nn6o gssp first occurrence of the ammonite Watinoceras devonense Wright & He npeACTaBnseTCB B03M0)KHbiM. Kennedy, 1981. A GSSP for the lower-middle Turonian boundary is proposed at the level of first occurrence of the ammonite Collignoni- KnioHeBbie cnosa: TypoHCKwü npyc, BepxHMû Men, ceras woollgari (Mantell, 1822) in the same section (Bed 120). -
ARTICLES Definition of Late Cretaceous Stage Boundaries In
ARTICLES De®nition of Late Cretaceous Stage Boundaries in Antarctica Using Strontium Isotope Stratigraphy J. M. McArthur, J. A. Crame,1 and M. F. Thirlwall2 Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom (e-mail: [email protected]) ABSTRACT New 87Sr/86Sr analyses of macrofossils from 13 key marker horizons on James Ross and Vega Islands, Antarctica, allow the integration of the Antarctic Late Cretaceous succession into the standard biostratigraphic zonation schemes of the Northern Hemisphere. The 87Sr/86Sr data enable Late Cretaceous stage boundaries to be physically located with accuracy for the ®rst time in a composite Southern Hemisphere reference section and so make the area one of global importance for documenting Late Cretaceous biotic evolution, particularly radiation and extinction events. The 87Sr/86Sr values allow the stage boundaries of the Turonian/Coniacian, Coniacian/Santonian, Santonian/Campanian, and Campanian/Maastrichtian, as well as other levels, to be correlated with both the United Kingdom and United States. These correlations show that current stratigraphic ages in Antarctica are too young by as much as a stage. Immediate implications of our new ages include the fact that Inoceramus madagascariensis, a useful fossil for regional austral correlation, is shown to be Turonian (probably Late Turonian) in age; the ªMytiloidesº africanus species complex is exclusively Late Coniacian in age; both Baculites bailyi and Inoceramus cf. expansus have a Late Con- iacian/Early Santonian age range; an important heteromorph ammonite assemblage comprising species of Eubostry- choceras, Pseudoxybeloceras, Ainoceras, and Ryugasella is con®rmed as ranging from latest Coniacian to very earliest Campanian. -
Codazziceras Ospinae (Karsten, 1858) from the Turonian (Upperᅢツᅡᅠcretaceous) of Colombia
Cretaceous Research 88 (2018) 392e398 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes Codazziceras ospinae (Karsten, 1858) from the Turonian (Upper Cretaceous) of Colombia * Pedro Patarroyo a, , Peter Bengtson b a Departamento de Geociencias, Universidad Nacional de Colombia, Cr. 30 N. 45-03, Bogota, Colombia b Institut für Geowissenschaften, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany article info abstract Article history: The ammonite Codazziceras ospinae (Karsten, 1858) is described from sections in the Upper Magdalena Received 29 December 2016 Valley and San Francisco, south and north-west of Bogota, Colombia. Its co-occurrence with species of Received in revised form Hoplitoides von Koenen, 1898, and Coilopoceras Hyatt, 1903, places it stratigraphically in the lower to 30 March 2017 middle Turonian, in contrast to previous assignments to the upper Turonian to lower Coniacian. Three Accepted in revised form 2 April 2017 specimens come from the lower part of the Loma Gorda Formation (TuronianeConiacian) and one Available online 4 April 2017 specimen from the middle part of the La Frontera Formation (loweremiddle Turonian). The type species of the genus Codazziceras Etayo-Serna, 1979, is Lyelliceras scheibei Riedel, 1938, which Keywords: Codazziceras is a junior synonym of Ammonites Ospinae Karsten, 1858. If a new type species is to be selected, Turonian Codazziceras ospinae will be the obvious choice. Cretaceous © 2017 Elsevier Ltd. All rights reserved. Ammonites Colombia 1. Introduction formation, spanning the Turonian and Coniacian, as evidenced by ammonites and inoceramids (cf. Carvajal Gonzalez and Patarroyo, During field work with geology students of the Universidad 2007; Patarroyo, 2011). -
En San Francisco, Cundinamarca (Colombia)
Boletín de Geología ISSN: 0120-0283 Vol. 38, N° 3, julio-septiembre de 2016 URL: boletindegeologia.uis.edu.co AMONOIDEOS Y OTROS MACROFÓSILES DEL LECTOESTRATOTIPO DE LA FORMACIÓN LA FRONTERA, TURONIANO INFERIOR - MEDIO (CRETÁCICO SUPERIOR) EN SAN FRANCISCO, CUNDINAMARCA (COLOMBIA) Pedro Patarroyo1 DOI: http://dx.doi.org/10.18273/revbol.v38n3-2016003 Forma de citar: Patarroyo, P. 2016. Amonoideos y otros macrofósiles del lectoestratotipo de la Formación La Frontera, Turoniano inferior - medio (Cretácico Superior) en San Francisco, Cundinamarca (Colombia). Boletín de Geología, 38(3): 41-54. RESUMEN Una sucesión de cerca de 109 m de espesor del lectoestratotipo de la Formación La Frontera (Colombia) se describe junto con el contenido fósil de Wrightoceras munieri (Pervinquière, 1907), Vascoceras cf. constrictum (Renz and Álvarez, 1979), V. cf. venezolanum Renz, 1982, Kamerunoceras sp., K. cf. turoniense (d’Orbigny, 1850), Hoplitoides cf. lagiraldae Etayo-Serna, 1979, Codazziceras ospinae (Karsten, 1858), Coilopoceras cf. newelli (Benavides-Cáceres, 1956); bivalvos: Anomia colombiana Villamil, 1996, e inocerámidos; y decápodos y plantas (troncos). Estos ejemplares incluidos dentro de la sucesión de la Formación La Frontera, en su mayoría, representan el Turoniano inferior - medio. La existencia de depósitos del Cenomaniano más alto hacia la base de la Formación La Frontera no se puede demostrar en este trabajo. Palabras clave: Formación La Frontera, Lectoestratotipo, Amonoideos, Turoniano, San Francisco-Cundinamarca AMMONITES AND OTHER MACROFOSSILS FROM THE LECTOSTRATOTYPE OF LA FRONTERA FORMATION, LOWER - MIDDLE TURONIAN (UPPER CRETACEOUS) IN SAN FRANCISCO, CUNDINAMARCA (COLOMBIA) ABSTRACT A succession of about 109 m thick of the La Frontera Formation lectostratotype (Colombia) is described as well as the fossils Wrightoceras munieri (Pervinquière, 1907), Vascoceras cf.