DOCSLIB.ORG

A Dufrenoyia (Ammonoidea, Deshayesitidae) Fauna from Germany: Evidence for D

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
A Dufrenoyia (Ammonoidea, Deshayesitidae) Fauna from Germany: Evidence for D A Dufrenoyia (Ammonoidea, Deshayesitidae) fauna from Germany: Evidence for D. furcata Zone deposits at the lower–upper Aptian boundary Jens Lehmann, Luc Bulot To cite this version: Jens Lehmann, Luc Bulot. A Dufrenoyia (Ammonoidea, Deshayesitidae) fauna from Germany: Evi- dence for D. furcata Zone deposits at the lower–upper Aptian boundary. Cretaceous Research, Else- vier, 2020, 116, pp.1-14. 10.1016/j.cretres.2020.104546. hal-03016302 HAL Id: hal-03016302 https://hal.archives-ouvertes.fr/hal-03016302 Submitted on 20 Nov 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 A Dufrenoyia (Ammonoidea, Deshayesitidae) fauna from Germany: 2 Improving the correlation of the lower/upper Aptian boundary 3 4 Jens Lehmanna, Luc Georges Bulotb, c 5 With 9 figures, and 1 table 6 a Faculty of Geosciences, University of Bremen, Klagenfurter Strasse, 28357 7 Bremen, Germany. E-mail address: [email protected] 8 9 b. Aix-Marseille Université, CNRS, IRD, INRA, Collège de France, Cerege, Site 10 Saint-Charles, Case 67, 3, Place Victor Hugo, 13331 Marseille Cedex 3, France; 11 [email protected] 12 c University of Manchester, Department of Earth and Environmental Sciences, 13 North Africa Research Group, M13 9PL Manchester, UK; 14 [email protected] 15 16 ABSTRACT 17 Dufrenoyia is a relevant ammonite genus for discussing the lower/upper Aptian 18 boundary on a supraregional scale. We present the first comprehensive account 19 on the genus from Germany, recording the two index species Dufrenoyia furcata 20 and Dufrenoyia transitoria from the Ahaus area. This is based on a yet 21 undescribed historical collection by the German nineteenth century palaeontologist 22 Clemens Schlüter. Our stratigraphic conclusions improves the correlation of the 23 poorly-known highest lower Aptian in Germany, particularly with the well-known 24 successions in England and France. An alleged dimorphism in Dufrenoyia furcata 25 is discussed. 2 26 Keywords. Ammonites; lower Aptian/upper Albian; historical material; northern 27 Germany; Correlations 28 29 1. Introduction 30 Almost 60 years ago Raymond Casey recommended to place the lower/upper 31 Aptian boundary at the last occurrence of Dufrenoyia, at the top of the Tropaeum 32 bowerbanki Zone, based on the well-exposed Lower Greensand succession in 33 southern England (Casey, 1961). In fact, in the Boreal-Atlantic subrealm 34 Dufrenoyia furcata can be used as an alternative to the uppermost lower Aptian 35 zonal index Tropaeum bowerbanki (Lehmann, 2015). Although this has been 36 debated over the years (e.g. Kemper, 1971) it is now widely accepted (Reboulet et 37 al., 2011; 2018; 2014). Our current knowledge indicates that the ammonite genus 38 Dufrenoyia is a well-established marker for recognizing the lower/upper Aptian 39 boundary in the Boreal as well as in the Tethys (Raisossadat et al., 2008), 40 whereas the distribution of other important markers like Tropaeum and 41 Australiceras is comparatively restricted (Lehmann et al., 2015). 42 The Aptian ammonites of the genus Dufrenoyia from North Germany described 43 here are a part of a collection assembled in the nineteenth century. At that time, 44 many small clay pits where existing in that area from which a large number of 45 fossils were collected. Nowadays, there is hardly any outcrops left. This is the 46 main reason why only 15 papers illustrating ammonites from in situ occurrences 47 from the Aptian in North Germany were published in the past 50 years (Kemper, 48 1971a, 1973a; Kemper and Zimmerle, 1978; Gaida et al., 1978; Kemper, 1976, , 49 1982a, , 1995; Weber, 1996; Mutterlose, 1996; Owen in Mutterlose et al., 2003; 50 Hoffmann and Mutterlose, 2011; Vespermann, 2006; Mutterlose and Wiedenroth, 3 51 2009; Lehmann et al., 2012; Lehmann et al. , 2016). Among those, ammonite 52 systematic is only addressed in a couple of contributions (Owen in Mutterlose et 53 al., 2003; Hoffmann and Mutterlose, 2011) and thus each further account is 54 reasonable. 55 56 2. Geological setting 57 All specimens referred to here have been obtained from the vicinity of the city of 58 Ahaus in northern Germany. During the Early Cretaceous this area was at the 59 western rim of the Lower Saxony Basin (LSB in the following; Fig. 1). The LSB 60 contains a several thousand meters thick sedimentary succession, spanning a 61 time interval from the latest Jurassic to the Late Cretaceous. During Aptian times, 62 the LSB was subdivided by small swells and islands into subbasins, but generally 63 it constituted a large epicontinental sea extending to the Proto-North Sea area, 64 and connected to the (proto-)Atlantic Ocean in the southwest and northwest 65 (Kemper, 1979; Ziegler, 1990). In the distal areas predominately shales were 66 deposited, including the local expression of OAE 1a (e.g. Lehmann et al., 2012), 67 whereas towards the basin margin, silty to sandy dark-grey claystone prevailed 68 (Mutterlose and Böckel, 1998). The material described here comes from a 69 restricted southernmost extension of the LSB called the Alstätte Bay (e.g. 70 Lehmann et al., 2012; von Bargen and Lehmann, 2014; Schlak et al., 2016; 71 =Alstätte Embayment of Kemper, 1973b and Herngreen et al., 1994). It represents 72 one of several small bays at the southwestern margin of the LSB (Wolburg, 1954; 73 Schott et al., 1969). Sediments of the Alstätte Bay were poorly exposed for many 74 decades and thus very little research was done for many years. This changed 75 fairly recently and a whole series of papers on the temporary EGW section in 4 76 Ahaus-Alstätte that was exposed from 2009 to 2019 was published (Hoffmann and 77 Mutterlose, 2011; Lehmann et al., 2012; Bottini and Mutterlose, 2012; Mutterlose 78 and Bottini, 2012; von Bargen and Lehmann, 2014; von Bargen et al., 2016; 79 Mutterlose et al., 2014; Schlak et al., 2016; Lübke and Mutterlose, 2016; Lehmann 80 et al., 2016). However, the Ahaus area became a classic area for Aptian 81 palaeontology in Germany already in the 19th century due to a large number of 82 fossiliferous, but now abandon clay pits (e.g. Ewald, 1861; Hilbck, 1867; Ziegler, 83 1873). It is quite surprising that the material focussed on herein can add quite a 84 few new data to this classical and seemingly well-explored area of 85 palaeontological research in Central Europe. 86 Figure 1 somewhere near here 87 88 3. Material and conventions 89 3.1 Previously known material 90 Dufrenoyia is a very rarely reported ammonite from Early Cretaceous deposits of 91 Germany. Already von Strombeck (1858: 444) reported an ammonite, erroneously 92 referred to as Ammonites Deshayesi, that is a Dufrenoyia since the cross section 93 shows a distinct ventrolateral edge (“Die Kante zwischen Rücken und Seite pflegt 94 dagegen bis ins höchste Alter hervorzustechen“). 95 First finds attributed to a species that is now included in Dufrenoyia were 96 mentioned by Ewald (1861: 338; not 1860 as cited by von Koenen 1902) from the 97 Ahaus area (Barler Berg) as Ammonites furcatus. The same specimens were later 98 briefly described by von Koenen (1902: 202-204), referring to them as Hoplites 99 furcatus Sowerby. Besides 10 specimens from the Ahaus area von Koenen (1902) 100 mentions two doubtfully conspecific specimens from Weenzen, Duingen area, in 5 101 the Hildesheim district. More recently, Kemper (1964: 42) referred to one of these 102 specimens in the University of Münster collection as Dufrenoya dufrenoyi 103 (d'Orbigny, 1840) [sic] – apparently the only specimen that survived until then. 104 Kemper (1971: pl. 26, fig. 2) figured Dufrenoyia furcata and since his figure 105 captions refers to being a part of the University of Münster collection it can be 106 assumed that he refers to the same specimen and actually revised his earlier 107 identification. In fact, this historical specimen remained the only material depicted 108 in the literature from Germany and consequently Kemper (1976: pl. 24, fig. 1 and, 109 1995: pl. 5, fig. 2) refigured this important find. 110 111 3.2 New material and conventions 112 One of us (JL) was visiting the historical collection of Clemens August Schlüter 113 (Fig. 2A) as a part of the University of Bonn collection in 2016, recognizing that the 114 Aptian/Albian part of this collection was scientifically not explored yet. All of the 115 material is housed in the Goldfuß-Museum für Paläontologie, University of Bonn, 116 Germany. Its acronym is IGPB (for “Institut für Geowissenschaften, Paläontologie, 117 Bonn”). Since these specimens are of historical importance additional to their 118 scientific value, no preparation works have been done to reveal the suture lines. 119 However, IGPB KrU16-5 is a slightly worn internal mould that shows the suture. 120 We used the suture terminology of Wedekind (1916), as applied by Kullmann and 121 Wiedmann (1970) and modified by Korn et al. (2003): E - external lobe, A - 122 adventive lobe (that is L of traditional nomenclature), U - umbilical lobe (I - internal 123 lobe is not applicable for the present material). The E/A (that is E/L of traditional 124 nomenclature) is the saddle between E and A and A/U (L/U of traditional 125 nomenclature) and corresponds to the saddle between A and U.
Load more

Recommended publications
  • On the Barremian - Lower Albian Stratigraphy of Colombia
    On the Barremian - lower Albian stratigraphy of Colombia Philip J. Hoedemaeker Hoedemaeker, Ph.J. 2004. On the Barremian-lower Albian stratigraphy of Colombia. Scripta Geologica, 128: 3-15, 3 figs., Leiden, December 2004. Ph.J. Hoedemaeker, Department of Palaeontology, Nationaal Natuurhistorisch Museum, P.O. Box 9517, 2300 RA Leiden, The Netherlands (e-mail: [email protected]). Key words – stratigraphy, Barremian, Aptian, depositional sequences, Colombia. The biostratigraphy and sequence stratigraphy of the Barremian deposits, and the biostratigraphy of the Aptian deposits in the Villa de Leyva area in Colombia are briefly described. Contents Introduction ....................................................................................................................................................... 3 Barremian ............................................................................................................................................................ 4 Barremian sequence stratigraphy ............................................................................................................ 6 Aptian ................................................................................................................................................................. 11 Lowermost Albian ........................................................................................................................................ 13 Conclusions ....................................................................................................................................................
    [Show full text]
  • Barraganfinal.Indd
    Revista Mexicana de Ciencias Geológicas, v.Aptian 22, núm. ammonite 1, 2005, zonation p. 39-47 for northern Mexico 39 Towards a standard ammonite zonation for the Aptian (Lower Cretaceous) of northern Mexico Ricardo Barragán-Manzo* and Ana Laura Méndez-Franco Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., Mexico. * [email protected] ABSTRACT Detailed data on twenty-seven species of ammonites identified in three stratigraphic sections of northern Mexico, allow further refinement of the Aptian ammonite biozonations of previous authors. Four formal ammonite biozones are proposed. Dufrenoyia justinae Taxon-Range-Zone for the uppermost part of the lower Aptian (Bedoulian), Epicheloniceras cf. subnodosocostatum/Acanthohoplites acutecosta Interval Zone representative of the middle Aptian (Gargasian), and Acanthohoplites aschiltaensis and Hypacanthoplites cf. leanzae Taxon-Range-Zones, spanning the upper Aptian (Clansayesian). The ammonite zonation proposed represents the advancements on the development of a standard scheme towards a reliable correlation with the biozonal scheme of England and the ammonite zonal standard of the Mediterranean area. Key words: biostratigraphy, ammonites, Aptian, Mexico. RESUMEN Estudios detallados de veintisiete especies de ammonites provenientes de tres secciones estratigráficas del norte de México, permiten redefinir los esquemas biozonales del Aptiano, establecidos previamente por otros autores para el área, con base en la distribución vertical de estos macrofósiles. En este trabajo se proponen cuatro biozonas formales de ammonites. La Zona de Rango Dufrenoyia justinae para la parte terminal del Aptiano inferior (Bedouliano), la Zona de Intervalo Epicheloniceras cf. subnodosocostatum/Acanthohoplites acutecosta representativa del Aptiano medio (Gargasiano) y las Zonas de Rango Acanthohoplites aschiltaensis e Hypacanthoplites cf.
    [Show full text]
  • The Barremian Heteromorph Ammonite Dissimilites from Northern Italy: Taxonomy and Evolutionary Implications
    The Barremian heteromorph ammonite Dissimilites from northern Italy: Taxonomy and evolutionary implications ALEXANDER LUKENEDER and SUSANNE LUKENEDER Lukeneder, A. and Lukeneder, S. 2014. The Barremian heteromorph ammonite Dissimilites from northern Italy: Taxon- omy and evolutionary implications. Acta Palaeontologica Polonica 59 (3): 663–680. A new acrioceratid ammonite, Dissimilites intermedius sp. nov., from the Barremian (Lower Cretaceous) of the Puez area (Dolomites, northern Italy) is described. Dissimilites intermedius sp. nov. is an intermediate form between D. dissimilis and D. trinodosum. The new species combines the ribbing style of D. dissimilis (bifurcating with intercalating single ribs) with the tuberculation style of D. trinodosum (trituberculation on entire shell). The shallow-helical spire, entirely comprising single ribs intercalated by trituberculated main ribs, is similar to the one of the assumed ancestor Acrioceras, whereas the increasing curvation of the younger forms resembles similar patterns observed in the descendant Toxoc- eratoides. These characters support the hypothesis of a direct evolutionary lineage from Acrioceras via Dissimilites to Toxoceratoides. D. intermedius sp. nov. ranges from the upper Lower Barremian (Moutoniceras moutonianum Zone) to the lower Upper Barremian (Toxancyloceras vandenheckii Zone). The new species allows to better understand the evolu- tion of the genus Dissimilites. The genus appears within the Nicklesia pulchella Zone represented by D. duboise, which most likely evolved into D. dissimilis. In the Kotetishvilia compressissima Zone, two morphological forms developed: smaller forms very similar to Acrioceras and forms with very long shaft and juvenile spire like in D. intermedius sp. nov. The latter most likely gave rise to D. subalternatus and D. trinodosum in the M.
    [Show full text]
  • Stable Carbon-Isotope Chemostratigraphy Versus Ammonite Biostratigraphy: Data from Around the Barremian/Aptian Boundary (Lower Cretaceous)
    STRATA, 2020, série 2e, vol. 56: 1-31 Stable carbon-isotope chemostratigraphy versus ammonite biostratigraphy: data from around the Barremian/Aptian boundary (Lower Cretaceous) Camille Frau1 Abstract. The complex and ornate carbon-isotope excursion of the lower Aptian Oceanic Anoxic Event (OAE) 1a is used as a potent means of worldwide marine correlations that has the potential to provide an independent control based on controversial ammonite dating. Re-examination of the best-documented expanded sections of the Tethyan, Boreal, and Pacific realms highlight the inconsistent positioning of ammonite key markers – mainly Deshayesitidae and Douvilleiceratidae – relative to the OAE 1a carbon- isotope excursion. This is not only due to taxonomic issues and substantial provincialism but also the weaknesses in the stratigraphic record caused by the sedimentary context of that oceanic anoxic event. Much detailed study and refinement of existing data are needed to reduce volatility in ammonite zonal boundaries from around the Barremian/Aptian boundary. Keywords. Ammonite, Carbon isotope; Chemostratigraphy, Aptian, Cretaceous, Oceanic Anoxic Event. Article history: manuscript receveid Novembre 23, 2020; accepted in revised form Decembre 16, 2020; available on line Decembre 30, 2020. Chimiostratigraphie de l’isotope du carbone versus biostratigraphie des ammonites : données autour de la limite Barrémien/Aptien (Crétacé Inférieur). Résumé. Les motifs caractéristiques de l’excursion du carbone associée à l’Évènement Anoxique Océanique (OAE) 1a de l’Aptien inférieur sont utilisés comme un outil puissant pour corréler mondialement les séries marines, et ont le potentiel pour fournir un contrôle indépendant des datations controversées basées sur les ammonites. Le réexamen des coupes les mieux documentées des domaines Téthysien, Boréal, et Pacifique montre la position irrégulière des marqueurs clefs ammonitiques – surtout ceux des Deshayesitidae et des Douvilleiceratidae – par rapport à l’excursion de l’OAE 1a.
    [Show full text]
  • Aptian (Lower Cretaceous) Biostratigraphy and Cephalopods from North Central Tunisia
    Cretaceous Research 30 (2009) 895–910 Contents lists available at ScienceDirect Cretaceous Research journal homepage: www.elsevier.com/locate/CretRes Aptian (Lower Cretaceous) biostratigraphy and cephalopods from north central Tunisia Jens Lehmann a,*, Matthias Heldt b, Martina Bachmann b, Mohamed E. Hedi Negra c a Geosciences Collection, Faculty of Geosciences, University of Bremen, Klagenfurter Strasse, 28357 Bremen, Germany b Geochronology working-group, Faculty of Geosciences, University of Bremen, Klagenfurter Strasse, 28357 Bremen, Germany c De´partement de Ge´ologie, Faculte´ des Sciences, Universite´ de Tunis, Campus Universitaire, 2092 Manar II, Tunis, Tunisia article info abstract Article history: Thick Aptian deposits in north central Tunisia comprise hemipelagic lower Aptian, reflecting the sea- Received 3 December 2008 level rise of OAE 1a, and an upper Aptian shallow marine environment characterized by the establish- Accepted in revised form 3 February 2009 ment of a carbonate platform facies. Carbon stable isotope data permit recognition of the OAE 1a event in Available online 12 February 2009 the Djebel Serdj section. Cephalopods are rare throughout these successions, but occurrences are sufficient to date the facies changes and the position of the OAE1a event. Ammonite genera include lower Keywords: Aptian Deshayesites, Dufrenoyia, Pseudohaploceras, Toxoceratoides and ?Ancyloceras; and upper Aptian Biostratigraphy Zuercherella, Riedelites and Parahoplites. Correlation of carbon isotope data with those of other Tethyan Lower Cretaceous Aptian sections is undertaken together with the integration of planktonic foraminiferal data. Ammonites Ó 2009 Elsevier Ltd. All rights reserved. Nautiloids Tunisia 1. Introduction limestone, marlstone or claystone facies (e.g. Bernaus et al., 2003); distal carbonate shelf settings often contain at least poor faunas In the lower Aptian, superplume activity in the Pacific realm (e.g.
    [Show full text]
  • The Georgian Heteromorph Ammonite Genera Kutatissites and Pseudoaustraliceras in Northwest Southamerica
    The Georgian heteromorph ammonite genera Kutatissites and Pseudoaustraliceras in Northwest Southamerica FERNANDO ETAYO-SERNA1 r-RESUMEN Se describen dos especi'menes de Kutatissites KAKABADZE (1970), los cuales provienen: 1) de las arcillolitas con concreciones de la parte superior de la Formacion La Paja, (Aptiano superior); 2) de las arcillolitas de la Formacion Socota (Aptiano). "Ancyioceras Columbiae BASSE, 1928", que tambien procede de la Formacion La Paja, es colocada taxonomicamente en el genero Pseudoaustraliceras KAKABADZE (1981). Estos generos habi'an sido descritos previamente solo del Viejo Mundo. Se pro­ pone que se explore la idea de la dispersion de estos grupos de cefalopodos, por transporte pasivo de "seudolarvas" via paleocorrientes calidas del mar de Tetis, con base en el estudio de sus primeros esta- dios ontogeneticos. -------------------------------------------------------------------------------------------------------------- ABSTRACT — Two specimens of the ammonite genus Kutatissites KAKABADZE (1970) are described from concretionary shales of Upper Aptian Age in Central Colombia. "A. Columbiae BASE, 1928", with sim­ ilar occurrence is placed in Pseudoaustraliceras KAKABADZE (1981). This extends the observed geographical and temporal ranges of both genera which hitherto had only been recorded in the Old World. Dispersal of individuals of both genera is interpreted as due to "pseudolarval" drift rather than to necroplanctonic drift. 1. Unlversidad Nacional de Colombia, A.A. 7495 INGEOMINAS A .A. 4865. GEOLOGIA NORANDINA, No. 7, Agosto de 1983 INTRODUCTION Discussion. Kutatissites was compared to H elycan- cy iu s (GABB, 1869, emend. ANDERSON, 1938), but ac­ Heteromorph ammonoids are frequently found in cre- cording to ANDERSON (1938: 222, pi. 79, figs. 4,5) on taceouj deposits of Colombia, but they have been only spo­ the latter genus ribs do not interrupt on the venter and radically reported on.
    [Show full text]
  • THE HETEROMORPHS and AMMONOID EXTINCTION by JOST WIEDMANN Geologisch-Palaontologischesinstitut, Universitat Tiibingen
    Biol. Rev. (1969), 44, pp. 563-602 563 THE HETEROMORPHS AND AMMONOID EXTINCTION BY JOST WIEDMANN Geologisch-PalaontologischesInstitut, Universitat Tiibingen (Received 19 May 1969) CONTENTS I. Introduction . 563 B. Developmental plasticity in space and time in heterornorphs . 590 11. Discussion . 565 C. Phylogenetic ‘laws’ and hetero- A. Triassic heteromorphs . 567 morphs . 590 B. Jurassic heteromorphs . 569 D. Factors in heteromorph evolution 592 E. Ammonoid extinction 593 C. Cretaceous heteromorphs . 572 . D. The course of heteromorph evolu- IV. Summary . 598 tion ..... 599 111. General remarks . A. Homologies and sutures in hetero- morphs and ammonoids . 588 I. INTRODUCTION The image of heteromorph ammonoids is today linked in our minds with notions of aberrant shell form, degeneration, typolysis and phylogenetic extinction. In most palaeontological works dealing with evolutionary principles the so-called heteromorphs are seen as a welcome illustration of the more or less synchronous extinction of com- plete Bauplane, a phenomenon which cannot be observed in nature and is therefore explicable only with difficulty. ‘There are furthermore aberrant forms which rapidly, one after another, show an ever stronger tendency to degenerate and produce biologically absurd structures which, if not directly lethal, have always been impartially understood as ridiculous for the basic concept of the ammonite form.’ (Translated from DacquC, 1935, p. 32.) ‘Just as the great ceratitoid group of ammonoids produced retrogressive as well as stationary and progressive forms during the Trias, so from one, or several, of the families just mentioned there arose decadent lines of descent. .Thus in Baculites the whole organization was affected by decadent influences, and it is therefore the most perfect impression of all-round retro- gression among the ammonoids.’ (Swinnerton, 1930, pp.
    [Show full text]
  • (Lower Cretaceous) Ammonites from the Basal Strata of the La
    Revista Mexicana de Ciencias Geológicas ISSN: 1026-8774 [email protected] Universidad Nacional Autónoma de México México Barragán, Ricardo; Maurrasse, Florentin J-M. R. Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications Revista Mexicana de Ciencias Geológicas, vol. 25, núm. 1, 2008, pp. 145-157 Universidad Nacional Autónoma de México Querétaro, México Available in: http://www.redalyc.org/articulo.oa?id=57225109 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Revista Mexicana de Ciencias Geológicas,Aptian v. 25, ammonites núm. 1, 2008, of the p. La145-157 Peña Formation, Mexico 145 Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: biochronostratigraphic implications Ricardo Barragán1,* and Florentin J-M. R. Maurrasse2 1 Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Delegación Coyoacán, 04510 México D. F., Mexico. 2 Department of Earth Sciences, Florida International University, University Park Campus, Miami, Florida, 33199, U. S. A. * [email protected] ABSTRACT Detailed paleontological studies of the basal strata of the La Peña Formation from a stratigraphic section of the State of Nuevo León, northeastern Mexico, reveal a rich ammonite assemblage representative of the local biozone indicative of the uppermost level of the early Aptian corresponding to the Dufrenoyia justinae Taxon Range Zone.
    [Show full text]
  • Ammonite Zones of Northern Chihuahua Keith Young, 1969, Pp
    New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/20 Ammonite zones of northern Chihuahua Keith Young, 1969, pp. 97-101 in: The Border Region (Chihuahua, Mexico, & USA), Cordoba, D. A.; Wengerd, S. A.; Shomaker, J. W.; [eds.], New Mexico Geological Society 20th Annual Fall Field Conference Guidebook, 228 p. This is one of many related papers that were included in the 1969 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States.
    [Show full text]
  • Redalyc.Glomospirella Cantabrica N. Sp., and Other Benthic Foraminifera from Lower Cretaceous Urgonian-Type Carbonates of Cantab
    Geologica Acta: an international earth science journal ISSN: 1695-6133 [email protected] Universitat de Barcelona España SCHLAGINTWEIT, F.; ROSALES, I.; NAJARRO, M. Glomospirella cantabrica n. sp., and other benthic foraminifera from Lower Cretaceous Urgonian-type carbonates of Cantabria, Spain: Biostratigraphic implications Geologica Acta: an international earth science journal, vol. 14, núm. 2, 2016, pp. 113-138 Universitat de Barcelona Barcelona, España Available in: http://www.redalyc.org/articulo.oa?id=50549465003 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Geologica Acta, Vol.14, Nº 2, June 2016, 113-138, I-III DOI: 10.1344/GeologicaActa2016.14.2.3 Glomospirella cantabrica n. sp., and other benthic foraminifera from Lower Cretaceous Urgonian-type carbonates of Cantabria, Spain: Biostratigraphic implications F. SCHLAGINTWEIT1 I. ROSALES2 M. NAJARRO2 1Lerchenauerstr., 167, 80935 Munich, Germany. E-mail: [email protected] 2Instituto Geológico y Minero de España (IGME) La Calera 1, 28760 Tres Cantos, Madrid, Spain ABSTRACT ' & & . ' 2 ( ' 5 ( %&, 4 . ? ? &: ' @ N % & &( ' && ' .&: &: ? > > > , & > . &
    [Show full text]
  • Intraspecific and Intrageneric Variabilities and Their Implication for the Systematics of Cretaceous Heteromorph Ammonites; a Review
    Intraspecific and intrageneric variabilities and their implication for the systematics of Cretaceous heteromorph ammonites; a review M.V. Kakabadze Kakabadze, M.V. Intraspecific and intrageneric variabilities and their implications for the systematics of Cretaceous heteromorph ammonites; a review. Scripta Geologica, 128: 17-37, 12 figs., Leiden, December 2004. Mikheil V. Kakabdze, A. Janelidze Geological Institute of the Academy of Sciences of Georgia, M. Alexidze str. 1/9, 0193 Tbilisi, Georgia ([email protected]). Key words – ammonites, heteromorphs, dimorphism, systematics, Cretaceous. The variability in the dimensions of the shell, and some changes in suture line, sculpture, whorl section and mode of coiling in the late ontogenetic stages, have in some cases no taxonomic significance for the recognition of genera and higher taxa of Cretaceous heteromorph ammonites. In many cases, such phenomena are due to intraspecific variation or variation within a genus. The intrageneric variations of some Cretaceous heteromorphs are discussed in detail in the light of new, rich Colombian material. In relation to these problems in systematics, some questions on the systematics of the superfamily Ancyloceratoidea Gill are considered. Contents Introduction ..................................................................................................................................................... 17 Discussion .......................................................................................................................................................
    [Show full text]
  • Aptian Ammonites from Mazapil, Zacatecas State
    Carnets Geol. 16 (14) Aptian ammonites from Mazapil, Zacatecas State (north-central Mexico) studied by BURCKHARDT in 1906: A revision Ricardo BARRAGÁN 1 Josep Anton MORENO-BEDMAR 2 Celestina GONZÁLEZ-ARREOLA 3 Abstract: Twelve specimens of Aptian ammonites reported and drawn by BURCKHARDT in 1906, from the Mazapil area (Zacatecas State, north-central Mexico), are reviewed for taxonomical purposes. The work by BURCKHARDT was the first report of Aptian ammonoids in Mexico. In addition, it represents the only record of Aptian ammonites known from Zacatecas State. The taxonomic review of the specimens allows for the recognition of Dufrenoyia sp., Colombiceras spathi HUMPHREY, Colombiceras mexicanus (HUMPHREY) n. comb., Colombiceras sp., Colombiceras spp., and Acanthohoplites aff. bigoureti (SEUNES). This ammo- nite assemblage is indicative of a stratigraphic range that spans the uppermost lower Aptian to the upper Aptian interval. Key Words: BURCKHARDT; ammonites; Aptian; Zacatecas State; Mexico. Citation: BARRAGÁN R., MORENO-BEDMAR J.A. & GONZÁLEZ-ARREOLA C. (2016).- Aptian ammonites from Mazapil, Zacatecas State (north-central Mexico) studied by BURCKHARDT in 1906: A revision.- Carnets Geol., Madrid, vol. 16, no. 14, p. 355-367. Résumé : Révision des ammonites aptiennes étudiées par BURCKHARDT en 1906 et provenant de Mazapil, État de Zacatecas (centre nord du Mexique).- Douze exemplaires d'ammonites aptiennes, provenant de la région de Mazapil (État de Zacatecas, centre nord du Mexique), signalées et illustrées par BURCKHARDT en 1906, sont révisées à des fins taxinomiques. Ce travail de BURCKHARDT constitue le premier rapport mentionnant des ammonoïdés aptiens au Mexique. Il s'agit, en outre, du seul compte- rendu portant des ammonites aptiennes récoltées dans l'État de Zacatecas.
    [Show full text]