Depositional Architecture of the Polish Epicontinental Middle Jurassic Basin
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Systematics of the Middle Jurassic Heteromorphic Ammonites
UDC 564. 53 . 01 SYSTEMATICS OF THE MIDDLE JURASSIC HETEROMORPHIC AMMONITES N. V. Besnosov and V. V. Kutuzova All-Union Scientific Research Petroleum Geologic Exploration Institute (VSEGEI) ABSTRACT: The stratigraphic distribution, phylogenetic relationships, and systema tics of the Middle Jurassic heteromorphic ammonites and their relationship to the monomorphic ammonites are considered. Sulcohamitoides gen. nov. and Ga�antiana as a�jani sp. nov. are described. * * * The vast majority of Middle Jurassic heteromorphic ammonites are shells with a spiral developing early in one plane, all the way to the formation of a straight tube in the outer part of the phragmocone and in the living chamber. They are also characterized by reduction of the U and I lobes in ontogenesis, manifested to a greater or lesser degree, and by only slight dissection of their lobes and saddles. The following generic names of the Jurassic heteromorphs are given in the lite rature. A�cuce�as Potonie, 1929, for which the family Arcuceratidae Arkell, 1950 has been proposed. This genus is based on a single species, A. ma�thae Potonie, from the Pliensbachian of Germany, the only specimen of which has been lost. Repeated searches at the type locality have been unsuccessful. It has been suggested that the dating is erroneous, or that the species and genus are based not on a heteromor phic ammonite, but on acrinoid stem. Apso��oce�as Hyatt, 1900, occurs in the lower half of the subfu�catum zone of the Upper-Bajocian and has usually been combined with Spi�oce�as Quenstedt, 1858, from which it differs in its less reduced U and I lobes and its finer sculpture. -
"Subfurcaten-Schichten" (Bajocium, Niortense-Zone) in Nordwestdeutschland
Osnabrücker naturwiss. Mitt. 5Abb.,4Taf. Osnabrück, Dez. 1992 Die Faunenhorizonte der "Subfurcaten-Schichten" (Bajocium, Niortense-Zone) in Nordwestdeutschland mit5 Abbildungen und 4 Tafeln Matthias Metz' Kurzfassung: Aufgrund neuer Aufschlüsse der "Subfurcaten-Schichten" (Bajocium, Niortense- Zone) in Nordwestdeutschland ist es möglich, die Schichtenfolge in Ammonitenfaunen-Horizonte zu untergliedern. Eine paläontologische Revision der Ammonitengattung Strenoceras HYATTmit den Untergattungen Strenoceras HYATT(m) und Garantiana HYATT(M) wird durchgeführt. [The faunal horizons of the "Subfurcaten-Schichten" (Bajocian, Niortense-Zone) in Northwest Germany) Abstract: Because of new exposures in the "Subfurcaten-Schichten" (Bajocian, Niortense- Zone) in Northwest Germany it is possible to subdivide the sequence in ammonite faunal hori- zons. A palaeontological revision of the genus Strenoceras HYATTwith the subgenus Strenoceras HYATT(m) and Garantiana HYATT(M) is executed. 1 Einleitung und historischer Überblick U Die ersten Hinweise auf die .Bifurcaten-Schichten" (= "Subfurcaten-Schichten ) fin- den sich bereits in den Veröffentlichungen von TRENKNER(1872; 1877) und POELMANN (1912) über die Juravorkommen in Osnabrück-Hellern. Im Wiehengebirge konnten LOHMANN(1909) bei Bad Essen und v. SEE (1910) an der Porta Westfalica die Schich- ten ebenfalls nachweisen. Der Begriff "Schichten oder Zone der Parkinsonia subturcete" wurde erstmals von SCHROEDER(1905) verwendet, der zahlreiche Vorkommen in Nordwestdeutschland beschrieb. Die paläontologische Erforschung ihrer Ammonitenfauna wurde von MAscKE (1907) und BENTZ (1924) mit dem aus dem Brauneisenoolith-Bergbau von Lindenbruch und Harlingerode (Harz-Vorland) gewonnenen Ammonitenmaterial begonnen. Demgegenüber sind die "Subfurcaten-SchichtenU im Bereich des Teuto- burger Waldes in toniger Fazies ausgebildet. Die wichtigsten Aufschlüsse waren die Tongruben von Bielefeld-Bethel (heute verfüllt). ALTHoFF (1914; 1922; 1928; 1938) veröffentlichte zahlreiche Profilaufnahmen. -
Ammonites and Stratigraphy of the Upper Bajocian Garantiana Garantiana Zone in the Interfluve Between the Kuban and Urup Rivers (Northern Caucasus) V
ISSN 0031-0301, Paleontological Journal, 2019, Vol. 53, No. 11, pp. 1188–1202. © Pleiades Publishing, Ltd., 2019. Ammonites and Stratigraphy of the Upper Bajocian Garantiana garantiana Zone in the Interfluve between the Kuban and Urup Rivers (Northern Caucasus) V. V. Mittaa, b, * aBorissiak Paleontological Institute, Russian Academy of Sciences, Moscow, 117647 Russia bCherepovets State University, Cherepovets, 162600 Russia *e-mail: [email protected] Received March 12, 2019; revised March 29, 2019; accepted April 1, 2019 Abstract—This paper presents the results of the study of the Upper Bajocian Garantiana garantiana Zone (Middle Jurassic) and characteristic ammonites in sections of the basin of the Kuban River (Karachay-Cher- kessia). The assemblage contains species of the genera Garantiana, Pseudogarantiana, Paragarantiana, Djanaliparkinsonia (all family Stephanoceratidae) and Vermisphinctes (family Perisphinctidae). A section of the Garantiana Zone on the Kyafar River contains (from bottom to top) Beds with Djanaliparkinsonia alanica (also recognized on the Kuban River), Beds with Garantiana subgaranti and Beds with Paragarantiana, approximately corresponding to the Dichotoma, Garantiana, and Tetragona subzones of the standard scale. Garantiana subgaranti Wetzel and Vermisphinctes martiusii (d’Orbigny) are described. Prorsisphinctes Buck- man, 1921 is proposed as a junior subjective synonym of Vermisphinctes Buckman, 1920. Keywords: Upper Bajocian, ammonites, Garantiana, Paragarantiana, Djanaliparkinsonia, Vermisphinctes, biostratigraphy, Northern Caucasus DOI: 10.1134/S0031030119110066 INTRODUCTION lished records of representatives of Garantianinae in the Garantiana Zone in the Northern Caucasus The Garantiana garantiana Zone is located (Ob”yasnitelnaya…, 1973; Yura…, 1992) are not sup- between the Upper Bajocian Strenoceras niortense and ported by figures or collections, and are mostly based Parkinsonia parkinsoni zones of the standard scale and on field identifications. -
Indici Bollettini Mrsn 1-37
INDICI BOLLETTINI MRSN 1-37 VOL. 1 (1983) Elachistidi del Giappone (Lepidoptera, Elachistidae) / Umberto Parenti. – P. 1-20 Il genere Aptinus Bonelli, 1810 (Coleoptera, Carabidae) / Achille Casale, Augusto Vigna Taglianti.. – P. 21- 58 Amphionthophagus , nuovo sottogenere di Onthophagus Latr. (Coleoptera, Scarabaeidae) / Fermín Martin Piera, Mario Zunino. – P. 59-76 I Dryinidae della collezione di Massimiliano Spinola: scoperta del materiale tipico di Anteon jurineanum Latreille, cambiamento di status sistematico per il genere Prenanteon Kieffer e descrizione di una nuova specie, Gonatopus spinolai (Hymenoptera, Dryinidae) / Massimo Olmi. – P. 77-86 Colpotrochia giachinoi n. sp., un nuovo Metopiinae (Hymenoptera, Ichneumonidae) del Nord Africa / Pier Luigi Scaramozzino. – P. 87-92 Osservazioni su alcune specie del genere Hinia Leach (in Gray), 1857 (Nassariidae) / Maria Pia Bernasconi. – P. 93-120 Un nuovo Trechus d’Algeria (Coleoptera, Carabidae) / Achille Casale. – P. 121-126 Dasypolia calabrolucana Hartig bona sp. (Lep. Noctuidae) / Emilio Berio. – P. 127-130 Raymondiellus casalei , nuova specie di Curculionide dell’Algeria (Coleoptera) / Massimo Meregalli. – P. 131-136 Popolamenti e tanatocenosi a molluschi dei fanghi terrigeni costieri al largo di Brucoli (Siracusa) / Italo Di Geronimo, Salvatore Giacobbe. – P. 137-164 Composición sistemática y orígen biogeográfico de la fauna ibérica de Onthophagini (Coleoptera, Scarabaeoidea) / Fermín Martin Piera. – P. 165-200 New data on Orthogarantiana (Torrensia) Sturani, 1971 (Ammonitina, Stephanocerataceae) in the European Upper Bajocian / Giulio Pavia. – P. 201-214 “Faunae Ligusticae Fragmenta” e “Insectorum Liguriae species novae” di Massimiliano Spinola: note bibliografiche / Pietro Passerin d’Entrèves. – P. 215-226 Notes on some Borelli’s types of Dermaptera (Insecta) / Gyanendra Kumar Srivastana. – P. 227-242 Nuovi Carabidae e Catopidae endogei e cavernicoli dei Balcani meridionali e dell’Asia minore (Coleoptera) / Achille Casale. -
Dimorphinites (Ammonoidea, Jurassic, Upper Bajocian) in the Precordillera of Northern Chile
DIMORPHINITES (AMMONOIDEA, JURASSIC, UPPER BAJOCIAN) IN THE PRECORDILLERA OF NORTHERN CHILE SIXTO R. FERNA´ NDEZ-LO´ PEZ1 AND GUILLERMO B. CHONG DIAZ2 1Departamento de Paleontologı´a, Facultad de Ciencias Geolo´gicas (UCM) and Instituto de Geologı´a Econo´mica (CSIC-UCM), Madrid 28040, Spain, ,[email protected].; and 2Departamento de Ciencias Geolo´gicas, Universidad Cato´lica del Norte, Antofagasta, Chile, ,[email protected]. This pdf file is licensed for distribution in the form of electronic reprints and by way of personal or institu- tional websites authorized by the author(s). A copyright license has been purchased to make this possible. Journal of Paleontology, 85(3), 2011, p. 395–405 Copyright ’ 2011, The Paleontological Society 0022-3360/11/0085-0395$03.00 DIMORPHINITES (AMMONOIDEA, JURASSIC, UPPER BAJOCIAN) IN THE PRECORDILLERA OF NORTHERN CHILE SIXTO R. FERNA´ NDEZ-LO´ PEZ1 AND GUILLERMO B. CHONG DIAZ2 1Departamento de Paleontologı´a, Facultad de Ciencias Geolo´gicas (UCM) and Instituto de Geologı´a Econo´mica (CSIC-UCM), Madrid 28040, Spain, ,[email protected].; and 2Departamento de Ciencias Geolo´gicas, Universidad Cato´lica del Norte, Antofagasta, Chile, ,[email protected]. ABSTRACT—A new upper Bajocian ammonite assemblage containing the morphoceratids Dimorphinites dimorphus (d’Orbigny) and Vigoriceras defrancei (d’Orbigny) is reported from the circum-Pacific area. These ammonites were found at the top of the Torcazas Formation, in the Quebrada San Pedro area, Precordillera of northern Chile. Taphonomic, systematic, and paleobiogeographic data confirm these dimorphs were part of indigenous populations within the Tarapaca Basin, belonging to the same demic biospecies: Dimorphinites defrancei (d’Orbigny). -
Middle Jurassic, Bajocian, Bathonian, Ammonitina, Biostratigraphy, Biochronology, Andes, South-America, Chile
FERNANDEZ-LOPEZ S., CHONG G., QUINZIO L.A. & WILKE H.G. 1994. The Upper Bajocian and Bathonian in the Cordillera de Domeyko, North-Chilean Precordillera : sedimentological and biostratigraphical results. [Le Ba jocien superieur et le Bathonien de la CordiIIere de Domeyko, PrecordilIere Nord-Chilienne : resultats sedimento logiques et biostratigraphiquesl. ABSTRACT The Jurassic ammonites of the CordiIIera de Domeyko have been studied in several monographies. The classic memoirs of Steinmann (1881), Tornquist (1898), Burckhardt (1903) and Stehn (1923) are particularly relevant. However, the biostratigraphic problems concerning stage boundaries arisen only in recent dates. New sedimentolo gical and biostratigraphical data have been obtained in relation to the BajocianlBathonian of this region. Several sections have been studied in two separate areas : Caracoles and Sierra de Varas. More than one thousand ammonites were collected in situ from these localities. Facies analysis shows that sedimentation during Late Bajocian and Bathonian occurs in a marine environment on a carbonate platform with abundant siliciclastic supply. Facies distribution was controlled by structural segmentation of the platform and processes of differential subsidence. The stratigraphical-sedimentological results together with taphonomical-palaeoecological observations are a diagnostic tool for sequence analysis. The successive ammonite assemblages which were found have allowed the establishment of four biostratigraphic units, spanning the interval from Upper Bajocian to Upper Bathonian. The sedimentological and biostratigraphical results indicate the existence of a regional discontinuity at the base of the Bathonian. KEY-WORDS: MIDDLE JURASSIC, BAJOCIAN, BATHONIAN, AMMONITINA, BIOSTRATIGRAPHY, BIOCHRONOLOGY, ANDES, SOUTH-AMERICA, CHILE. RESUME Les ammonites du Jurassique de la CordiIIere de Domeyko ont ete traitees dans plusieurs monographies, parmi lesqueIIes les memoires classiques de Steinmann (1881), Tornquist (1898), Burckhardt (1903) et Stehn (1923) sont particulierement importants. -
The Base of the Zigzag Zone in the Ravin Du Bès Section (Bas-Auran, Subalpine Basin, SE France) As the GSSP for the Base of the Bathonian Stage
ISJS BATHONIAN BALLOT 2007-2008 1 The base of the Zigzag Zone in the Ravin du Bès Section (Bas-Auran, Subalpine Basin, SE France) as the GSSP for the base of the Bathonian Stage SIXTO R. FERNÁNDEZ-LÓPEZ, GIULIO PAVIA, ELISABETTA ERBA, MYETTE GUIOMAR, MARIA H. HENRIQUES, ROBERTO LANZA, CHARLES MANGOLD, NICOL MORTON, DAVIDE OLIVERO AND DANIELE TIRABOSCHI Fernández-López, S.R., Pavia, G., Erba, E., Guiomar, M., Henriques, M.H., Lanza, R., Mangold, C., Morton, N., Olivero, D. & Tiraboschi, D. 2007: The base of the Zigzag Zone in the Ravin du Bès Section (Bas-Auran, Subalpine Basin, SE France) as the GSSP for the base of the Bathonian Stage. International Subcommission on Jurassic Stratigraphy, Bathonian Ballot 2007-2008. 44 pp. Sixto Rafael Fernández-López [[email protected]], Departamento y UEI de Paleontología, Facultad de Ciencias Geológicas (UCM) e Instituto de Geología Económica (CSIC-UCM), 28040-Madrid (Spain); Giulio Pavia [[email protected]], Dipartimento di Scienze della Terra, via Valperga Caluso 35, 10125-Torino (Italy); Elisabetta Erba [[email protected]], Dipartimento di Scienze dalla Terra “Ardito Desio”, Università degli Studi di Milano, Via Mangiagalli, 34, 20133-Milano (Italy); Myette Guiomar [[email protected]], Centre de géologie – Parc Saint-Benoît, 04000- Digne les bains (France); Maria Helena Henriques [[email protected]], Departamento Ciências da Terra e Centro de Geociências, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3000-272 Coimbra (Portugal); Roberto Lanza [[email protected]], -
Formal Proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin Du Bes Section (Bas-Auran, SE France)
Formal proposal for the Bathonian GSSP (Middle Jurassic) in the Ravin du Bes Section (Bas-Auran, SE France) SIXTO R. FERNANDEZ-L6PEZ " *, GIULIO P AVIA 2, ELISABETTA ERBA3, MYETT GUIOMAR., MARIA H, HENRIQUES5, ROBERTO LANZA2, CHARLES MANGOLD6, DAVIDE OLIVER06 & DANIELE TIRABOSCHI3 Key words: Bathonian GSSp, cbroll ostratigraphy, biostratigraphy, geochronology, Ammonoidea, calcareous nannofossils ABSTRACT The Bathonian Global Stratotype Section and Point (GSSP) is proposed at nannofossils) for worldwide correlation. The base of the Bathonian Stage the base of limestone bed RB071 (bed 23 in Sturani 1967) in the Ravin du and Zigzag Zone in Bas-Auran corresponds to the first occurrence level of Bes Section (43057' 38" N, 6° IS' 55" E), Bas-Auran area, "Alpes de Haute Gonolkites convergens BUCKMAN, which coincides with the first occurrence of Provence" French department. The Ravin du BesSectioll, as formal candidate Morphoceras parvum WETZEL Calcareous nannofossils, as secondary global GSSP for the base of the Bathonian Stage, satisfies most of the requirements marker, are present in all beds and allow characterizing the Bajocian-Batho recommended by the International Commission on Stratigraphy: 1) The ex nian transition.3) Regional analyses of sequence stratigraphy and manganese posure extends over 13 m in thickness. At the Bajocian-Bathonian transition, chemostratigraphy are available. Spectral gamma-ray data corroborate an no vertical (bio-, ichno- or tap ho-) facies changes, condensation, stratigraphic Early Bathonian deepening half-cycle of second order. 4) The criteria of ac gaps or hiatuses have been recorded. Structural complexity, synsedimentary cessibility,conservation and protection are assured by the "Reserve Naturelle and tectonic disturbances, or important alterations by metamorphism are not Geologique de Haute Provence". -
Biostratigraphy, Lithostratigraphy, Ammonite Taxonomy and Microfacies Analysis of the Middle and Upper Jurassic of Norteastern Iran
Biostratigraphy, Lithostratigraphy, ammonite taxonomy and microfacies analysis of the Middle and Upper Jurassic of norteastern Iran. Dissertation zur Erlangung des Naturwissenschaftlichen Doktorgrades Der Bayerischen Julius-Maximilians-Universität Würzburg vorgelegt von Mahmoud Reza Majidifard aus Teheran Würzburg, 2003-10-22 I To my wife and my daughter II Abstract The Middle and Upper Jurassic sedimentary successions of Alborz in northern Iran and Koppeh Dagh in northeastern Iran comprise four formations; Dalichai, Lar (Alborz) and Chaman Bid, Mozduran (Koppeh Dagh). In this thesis, the biostratigraphy, lithostratigraphy, microfacies, depositional environments and palaeobiogeography of these rocks are discussed with special emphasis on the abundant ammonite fauna. They constitute a more or less continuous sequence, being confined by two tectonic events, one at the base, in the uppermost part of the Shemshak Formation (Bajocian), the so-called Mid-Cimmerian Event, the other one at the top (early Cretaceous), the so-called Late-Cimmerian Event. The lowermost unit constitutes the uppermost member of a siliciclastic and partly continental depositional sequence known as Shemshak Formation. It contains a fairly abundant ammonite fauna ranging in age from Aalenian to early Bajocian. The following unit (Dalichai Formation) begins everywhere with a significant marine transgression of late Bajocian age. The following four sections were measured: The Dalichai section (97 m) with three members; the Golbini-Jorbat composite section (449 m) with three members of the Dalichai Formation (414 m) and two members of the Lar Formation (414 m); the Chaman Bid section (1556 m) with seven members, and the Tooy-Takhtehbashgheh composite section (567 m) with three members of the Dalichai Formation (567 m) and four members of the Mozduran Formation (1092 m). -
Abstracts Volume
September 14-16, 2007 Sapporo, Japan Hokkaido University, Conference Hall Abstracts Volume website: http://www.cephalopod.jp e-mail: [email protected] Co-organized with the 21st Century Center of Excellence (COE) Program for "Neo-Science of Natural History", Faculty of Science, Hokkaido University Seventh International Symposium Cephalopods -- Present and Past, September, 2007. Sapporo, Japan. Honorary Committee Prof. Tatsuro Matsumoto (Professor Emeritus of Kyushu University, Honorary President of the Palaeontological Society of Japan, Member of the Japan Academy) Prof. Tadashi Sato (Professor Emeritus of the University of Tsukuba, President of the Fukada Geological Institute) Prof. Takashi Okutani (Professor Emeritus of the Tokyo Fisheries University, President of the Malacological Society of Japan) Organizing Committee Hiromichi Hirano (Waseda University, Co-chair) Kazushige Tanabe (University of Tokyo, Co-chair) Yasunari Shigeta (National Museum of Nature and Science, Secretary) Takenori Sasaki (University Museum, University of Tokyo, Treasure) Haruyoshi Maeda (Kyoto University, Member) Takashi Okamoto (Ehime University, Member) Masayuki Ehiro (Tohoku University Museum, Member) Seiichi Toshimitsu (Geological Survey of Japan, Member) Tsunemi Kubodera (National Museum of Nature and Science, Member) Hiroshi Nishi (Hokkaido University, Member) Scientific Committee Neil H. Landman (American Museum of Natural History, New York, NY, USA) Pascal Neige (University of Bourgogne, Dijon, France) Christian Klug (Paleontolgical Institute and Museum, -
Late Bajocian–Bathonian Ammonites from Northeast Iran
ACTA PALAEONTOLOGICA ROMANIAE (2015) V. 11 (2), P. 25-41 LATE BAJOCIAN–BATHONIAN AMMONITES FROM NORTHEAST IRAN Mahmoud Reza Majidifard Received: 19 August 2015 / Accepted: 18 December 2015 / Published online: 22 December 2015 Abstract The present study is the first part of a larger work concerning the systematic descriptions of the fairly rich Middle to Upper Jurassic (Late Bajocian–Early Tithonian) ammonite fauna from the northeast of Iran. The described ammonites come from the lower part of the Dalichai Formation, consisting of an alternation of green marl, grey limestone and marly limestone, and comprise the families Phylloceratidae, Spiroceratidae, Oppeliidae, Sphaeroceratidae, Stephanoceratidae, Tulitidae, Parkinsoniidae, Morphoceratidae and Perisphinctidae. Some of the taxa are recorded for the first time from Iran: Adabofoloceras subobtusum, Spiroceras cf. orbignyi, Spiroceras annulatum, Cadomites (Polyplectites) cf. dorni, Sphaeroceras tutthum, Garantiana (Orthogarantiana) cf. Densicostata, Garantiana (Pseudogarantiana) dichotoma, Morphoceras egrediens, Microbajocisphinctes cf. pseudointerruptus, Homoeoplanulites (Homoeoplanulites) cf. bugesiacus, Homoeoplanulites (Parachoffatia) arkelli. The following Upper Bajocian to Lower Bathonian ammonite zones are present: Niortense, Garantiana, Parkinsoni, Zigzag, Retrocostatum and Discus. Palaeobiogeographically, the described ammonite fauna is closely related to those from the Sub-Mediterranean Province of the northwestern Tethys. Keywords: Jurassic; Iran; Late Bajocian–Bathonian; ammonites; -
Stuttgarter Beiträge Zur Naturkunde
© Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at 73 / TTiT^nT - Stuttgarter Beiträge zur Naturkunde f 26f HerausgegebenH u vom lU I Staatlichen Museum für Naturkunde in Stuttgart Serie B (Geologie und Paläontologie), Nr. 14 Stuttgart 1974 Zur Stratigraphie und Atnmonitenfauna des Dogger, insbesondere des Oberbajocium der westlichen Keltiberischen Ketten (Spanien) Von Gerd Dietl, Ludwigsburg Mit 3 Tafeln, 7 Abbildungen und 1 Tabelle Zusammenfassung Vom Südrand der Sierra de la Demanda und den südwestlichen Ausläufern der Sierra de los Ca- meros werden einige Dogger-Aufschlüsse beschrieben und in Profilen dargestellt. Mit Hilfe der gesammelten Ammoniten-Faunen konnte die Schichtenfolge gegliedert werden. Das Oberbajocium, welches detailliert untersucht wurde, läßt sich wie in Nordwest-Europa in folgende Zonen untergliedern: subfurcatum-, garantiana- und parkinsoni-Zone. Aus diesem Schichtenbereich werden einige wichtige Ammoniten kurz beschrieben und abgebildet. S u m m a r y A description is given of some Dogger exposures from the southern edge of the Sierra de la Demanda as well as from the south-westerly spurs of the Sierra de los Cameros. Sections through these exposures have also been drawn up. The stratigraphie sequence could be determined with the aid of ammonites collected. The Upper Bajocian — which forms the focal point of this paper — was sub-divided by means of its rieh ammonite fauna into the following zones: subfurcatum-, garantiana- und parkinsoni-zone. A few important ammonite forms from these zones are described and illustrated. Einleitung Das Arbeitsgebiet liegt am Südrand der Sierra de la Demanda. Der Schwerpunkt der Untersuchungen lag in den südwestlichen Ausläufern der Sierra de los Cameros, die zu den Iberischen Ketten in Nordspanien gehören.