Bajocium, …Gerd Dietl
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
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. -
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. -
Földtani Közlöny
Földtani Közlöny A MAGYARHONI FÖLDTANI TÁRSULAT FOLYÓIRATA БЮЛЛЕТЕНЬ ВЕНГЕРСКОГО ГЕОЛОГИЧЕСКОГО ОБЩЕСТВА BULLETIN DE LA SOCIÉTÉ GÉOLOGIQUE DE HONGRIE ZEITSCHRIFT DER UNGARISCHEN GEOLOGISCHEN GESELLSCHAFT BULLETIN OF THE HUNGARIAN GEOLOGICAL SOCIETY T. 105. No. 2. (1975) FÖLDTANI KÖZLÖNY A MAGYARHONI FÖLDTANI TÁRSULAT FOLYÓIRATA 105. KÖTET TARTALOMJEGYZÉK - СОДЕРЖАНИЕ - CONTENU ÉRTEKEZÉSEK — НАУЧНЫЕ СТАТЬИ - MEMOIRES DE. STEGENA L.—DE. GÉCZY В.—HORVÁTH F.: A Pannon-medence késő-kainozóos fejlődése — Evolution néogénique récente du Bassin pannonique 101—123 DR. GÉCZY В.: A magyar őslénytan időszerű problémái 124—128 KOVÁTS L.—DR. NAGY L.: Ujabb észlelések a szilikogén porok DTA vizsgálatában 129—142 NÉMETH MÁRTA: Ujabb mészalgák a Bükk-hegységi középsőkarbonból — Neuere Kalkalgen aus dem Mittel karbon des Bükk-Gebirges in Nordungarn 143—154 DR. SIDO MÁRIA: A tatai formáció Foraminiferái (felsőapti) — The Foraminifera of Tata Formation (Upper Aptian) 155—187 DR. В ALDI T. — BÁLDINÉ ВЕКЕ MÁRIA—HORVÁTH MÁRIA—NAGYMAROSI A. —BALOGH K. — SÓS EDIT: Adatok a magyarországi kiscelli agyag abszolút és relatív korához — On the Radiometric Age and the Biostratigraphic Position of the Kiscell Clay in Hungary 188—192 SINGH А. К.: A talajgeokémiai vizsgálatok, mint alkalmazható geokémiai kutató-módszer a rózsabányai területen — Soil analysis as a method of geochemical prospecting in Nagybörzsöny ore deposit, Hungary 193—207 GALÁCZ A.: Bajóci szelvények az Északi Bakonyból — Coupes bajociennes dans le Bakony Septentrional 208—219 DR. T. KOVÁCS G.: A Duna—Tisza köze déli részének miocén képződményei — Das Miozän im Südteil des Donau—Theiss-Zwischenstromlandes 220—236 HÍREK, ISMERTETÉSEK — СООБЩЕНИЯ, РЕЦЕНЗИИ — NOTICES, REVUE BIBLIOGRA PHIQUE 237—247 TÁRSULATI ÜGYEK — ДЕЛА ОБЩЕСТВА - AFFAIRES DE LA SOCIÉTÉ 248-255 ÉRTEKEZÉSEK Földtani Közlöny, Bull, of the Hungarian Oeol. -
Ammonites from Bathonian and Callovian (Middle Jurassic)
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Universität München: Elektronischen Publikationen 253 Zitteliana 89 Ammonites from Bathonian and Callovian (Middle Jurassic) North of Damghan, Paläontologie Bayerische EasternGeoBio- Alborz, North Iran & Geobiologie Staatssammlung Center LMU München LMU München für Paläontologie und Geologie Kazem Seyed-Emami1* & Ahmad Raoufian2 München, 01.07.2017 1School of Mining Engineering, University College of Engineering, University of Tehran, Manuscript received P.O. Box 11365-4563, Tehran, Iran 2 26.09.2016; revision Daneshvar Center, Farhangian University, Neyshapour, Iran accepted 30.10.2016 *Corresponding author; E-mail: [email protected] ISSN 0373-9627 ISBN 978-3-946705-00-0 Zitteliana 89, 253–270. Abstract The following Middle Jurassic ammonite families (subfamilies) are described from the Dalichai Formation north of Damghan (eastern Alborz), some of them for the first time: Phylloceratidae, Lytoceratidae, Oppeliidae (Hecticoceratinae), Stephanoceratidae (Cadomitinae), Tulitidae and Reineckeiidae. The fauna is typically Northwest-Tethyan and closely related to Central Europe (Subboreal – Submediterra- nean Provinces). Key words: Ammonites, Dalichai Formation, Middle Jurassic, Alborz, Iran Zusammenfassung Aus der Dalichai Formation nördlich von Damghan (Ostalborz) werden einige mitteljurassische Ammoniten, teils zum ersten Mal, beschrieben. Folgende Familien und Unterfamilien sind vertreten: Phylloceratidae, Lytoceratidae, Oppeliidae (Hecticoceratinae), Steph- anoceratidae (Cadomitinae), Tulitidae und Reineckeiidae. Die Fauna ist typisch für die Nordwest-Tethys und zeigt enge Beziehungen zu Zentraleuropa (Subboreale und Submediterrane Faunenprovinz). Schlüsselwörter: Ammoniten, Dalichai Formation, Mittlerer Jura, Alborz, Iran Introduction the frame of a MSc. thesis. For the present study, a new section nearby was chosen and collections The present study is a continuation of a larger re- were made by A. -
Zaton 2010 Part 1.Cdr
Palaeontographica, Abt. A: Palaeozoology - Stratigraphy Article Vol. 292, Issues 4 -6 : 115-213 Stuttgart, September 2010 Bajocian - Bathonian (Middle Jurassic) ammonites from the Polish Jura. Part 2: Families Stephanoceratidae, Perisphinctidae, Parkinsoniidae, Morphoceratidae and Tulitidae by M i c h a l Z a t o n With 15 plates, IS text-figures and 4 tables Abstract The present paper is the second, and last, part o f a larger monographic work concerning the systematic descriptions o f the Bajo- cian-Bathonian (Middle Jurassic) ammonite fauna irom the Polish Jura, south-central Poland. In this part, the systematic description ot the ammonite species belonging to the families Stephanoceratidae, Perisphinctidae, Parkinsoniidae, Morphoceratidae and Tulitidae is given. Fifty seven species, twenty one o f which left in open nomenclature, representing fifteen genera ( Teloceras, Normannites, G a ran tian a, C adom ites, 'iLeptosphinctes, Vermisphinctes, Procerites, Wagnericeras, Choffatia, Parkinsonia, Morphoceras, Asphinctites, Tulites, Bullatimorphites and Morrisiceras) are described. The stratigraphic ranges o f the species coming from investigated sections of the Polish Jura were presented, as well. The palaeobiogeographic analysis on the species level shows, that since latest Bajocian (Parldn- soni Chron) up to Late Bathonian (Orbis Chron), the ammonite assemblages o f the Polish Jura were most similar to those o f the western and north-western regions. Although the influence o f Tethyan ammonite faunas is visible in particular chrons, it was insig nificant. Only during the latest Bajocian (Parkinsoni Chron), the strong influence o f Tethyan ammonites is clearly visible and linked to the transgressive pulse from the south. Keywords: Bajocian, Bathonian, ammonites, palaeobiogeography, Poland Table o f contents 1. -
First Record of Late Callovian to Early Oxfordian Heteromorph Ammonites
Annales de Paléontologie 102 (2016) 117–121 Disponible en ligne sur ScienceDirect www.sciencedirect.com Original article First record of Late Callovian to Early Oxfordian heteromorph ammonites Découverte d’ammonites hétéromorphes du Callovien supérieur et de l’Oxfordien inférieur a,b,c,∗ c Didier Bert , Philippe Courville a Réserve naturelle nationale géologique de Haute-Provence, Service Environnement, Conseil départemental des Alpes de Haute-Provence, 13, rue du Docteur-Romieu, CS 70216, 04995 Digne-Les-Bains cedex 9, France b Laboratoire du Groupe de recherche en Paléobiologie et biostratigraphie des Ammonites (GPA), Bois-Mésange, quartier Saint-Joseph, 04170 La Mure-Argens, France c UMR, CNRS 6118 géosciences, université de Rennes-1, campus Beaulieu, bâtiment 15, 35042 Rennes cedex, France a r t i c l e i n f o a b s t r a c t Article history: The outstanding discovery of two heteromorph ammonites in Late Callovian and Early Oxfordian deposits, Received 25 April 2016 where such ammonites were deemed absent, substantially reduce the interval without heteromorph Accepted 30 May 2016 ammonite known into the Jurassic. A new species is described for the Early Oxfordian: Acuariceras acu- Available online 27 June 2016 costis sp. nov.; the Late Callovian Parapatoceras cf. tuberculatum is also studied. These latter expands our knowledge of the latest Parapatoceratinae and complete their stratigraphic distribution. The evolution Keywords: of ornamentation between A. acuarius/Paracuariceras incisum and A. acucostis sp. nov., from which it is Jurassic heteromorph ammonites derived, tends toward a net reinforcement of the ribs at least on the body chamber. Without the preser- Callovian vation of the suture lines however, it is difficult to know the relationships maintained between the new Oxfordian France species and the genera Acuariceras and Paracuariceras. -
Saint-Julien-En- Genevois, Résulte Du Même Type De Déformation
SAINT-JULIEN-EN GENEVOIS M DONZEAU. R WERNLI. J CHAROLLAIS. G MONJUVENT SAINT-JULIEN-EN-GENEVOIS La carle géologique à 1/50000 SAINT-JULIEN-EN-GENEVOIS est LHG recouverte par les coupures suivantes ~SHGN de la Carle géologique de ta France à 1/80000 --=:-- SIGN au sud-ouest: NANTUA (N° 160) SIEGN au sud-est. ANNECY (N" 160 bis) -.SNHGS au nord-ouest: SAINlCLAUDE iN° 149) DtPARTEMENT Dt; l'imEAIEuA OE l'ENVIRONNEMENT otPAATEMENT OE L1NTERIEUR liT DES IoJ'fAIAES REGIONALES SERVICE MYllflOI-OG>OOE ET au nord-est: THONON (N" 150) SERVICE (;,t,NTOtlAL DE GtOl-OO'E DE GENE~E GEOl-OGIOl)E " ...nONAl ,,",_Son__ CH '~"GE_I·SI.OSSE """"""'IlE""" SUISSE -- ._<:- MINISTÈRE DE L'ÉCONOMIE, --- -- DES FINANCeS ET DE L'INOUSTRIE '...JULIEN _.. BAGM· SERVICE GEOlOGIOUE NATIONAL "-- -- BP 6009· ~5060 ORLI"ANS CEOEX 2· FRANce BRGt,; _.- -- --, NOTICE EXPLICATIVE DE LA FEUILLE SAINT-JULIEN-EN-GENEVOIS À 1/50 000 par M. DONZEAU, R. WERNLI, J. CHAROLLAIS, G. MONJUVENT 1997 Editions du BRGM Service géologique national Références bibliographiques. Toute référence en bibliographie à ce document doit être faite de la façon suivante : pour la carte : DONZEAU M., WERNLIR., CHAROLLAIS J., MONJUVENTG. (1997) — Carte géol. France (1/50 000), feuille Saint-Julien-en-Genevois (653). Orléans : BRGM. Notice explicative par M. Donzeau, R. Wernli, J. Charollais, G. Monjuvent (1997), 144 p. pour la notice : DONZEAU M., WERNLI R., CHAROLLAIS J., MONJUVENT G. (1997) — Notice explicative, Carte géol. France (1/50 000), feuille Saint-Julien-en-Genevois (653). Orléans : BRGM, 144 p. Carte géologique par M. Donzeau, R. Wernli, J. -
Sexual Dimorphism in the Bathonian Morphoceratid Ammonite Polysphinctites Tenuiplicatus
Sexual dimorphism in the Bathonian morphoceratid ammonite Polysphinctites tenuiplicatus HORACIO PARENT and MICHAŁ ZATOŃ Parent, H. and Zatoń, M. 2016. Sexual dimorphism in the Bathonian morphoceratid ammonite Polysphinctites tenuipli- catus. Acta Palaeontologica Polonica 61 (4): 875–884. Asphinctites tenuiplicatus [M] and Polysphinctites secundus [m] from the Asphinctites tenuiplicatus Zone (Early Batho- nian), are usually considered as a sexual dimorphic pair, although authors describe them as separate species. We used statistical methods to test the sexual dimorphic correspondence between those morphospecies, based on a rather large sample of well-preserved macro- and microconchs derived from a single horizon of calcareous concretions in the Polish Jura. Our results indicate that both dimorphs or sexes have identical ontogeny up to a critical diameter, from which they diverge towards the characteristic morphology and sculpture of each dimorph. Thus, both dimorphs are described as a single species: Polysphinctites tenuiplicatus [M and m]. After review of the several nominal species usually assigned to the genera Asphinctites and Polysphinctites throughout their stratigraphic and biogeographic range in the Early Bathonian of the Tethys, it is concluded that they actually correspond to only two species of a single lineage. The corre- sponding name for the lineage should be Polysphinctites (= Asphinctites as a junior synonym). Key words: Ammonoidea, Morphoceratidae, dimorphism, macroconch, microconch, Jurassic, Poland. Horacio Parent [[email protected]], Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Ro- sario, Pellegrini 250, 2000 Rosario, Argentina. Michał Zatoń [[email protected]], University of Silesia, Faculty of Earth Sciences, Department of Palaeontology and Stratigraphy, ul. Będzińska 60, 41-200 Sosnowiec, Poland. -
О Некоторых Rarecostites (Parkinsoniidae, Ammonoidea) Зоны Parkinsoni Верхнего Байоса Северного Кавказа © 2017 Г
ПАЛЕОНТОЛОГИЧЕСКИЙ ЖУРНАЛ, 2017, № 5, с. 13–26 УДК 564.53:551.762.22(470.631) О НЕКОТОРЫХ RARECOSTITES (PARKINSONIIDAE, AMMONOIDEA) ЗОНЫ PARKINSONI ВЕРХНЕГО БАЙОСА СЕВЕРНОГО КАВКАЗА © 2017 г. В. В. Митта Палеонтологический институт им. А.А. Борисяка РАН e-mail: [email protected] Поступила в редакцию 21.09.2016 г. Принята к печати 24.10.2016 г. Приведены результаты изучения аммонитов рода Rarecostites подсемейства Parkinsoniinae из ниж- ней части зоны Parkinsonia parkinsoni верхнего байоса р. Кяфар (бассейн р. Большой Зеленчук, Ка- рачаево-Черкесия). Здесь найдены многочисленные раковины микроконхов R. subarietis (Wetzel). Вслед за А. де Гроссувром (de Grossouvre, 1919) названия R. acris (Wetzel) и R. arietis (Wetzel) предла- гается считать субъективными синонимами R. subarietis, с заменой названия стандартной подзоны Acris на Subarietis. В нижней части разреза найдены также многочисленные микроконхи R. sherstyu- kovi sp. nov. и более редкие макроконхи R. kyafarensis sp. nov. Обсуждаются филогенетические взаи- моотношения видов Rarecostites; приведены описания и изображения перечисленных видов, уста- новлены фаунистические горизонты sherstyukovi и subarietis. DOI: 10.7868/S0031031X17050051 ВВЕДЕНИЕ 200 экз. аммонитов рода Parkinsonia (sensu lato). Аммониты семейства Parkinsoniidae широко Коллекция дополнена сборами любителя палеон- распространены по всей северной периферии тологии М.П. Шерстюкова (Ставрополь, Россия) океана Тетис и являются одной из важнейших из этих же местонахождений. Ниже приводятся групп аммонитов для биостратиграфического -
Paleontology – Michael Kogan
BIOPH IL ATELY OFFICIAL JOURNAL OF THE BIOLOGY UNIT OF ATA DECEMBER 2020 VOLUME 69 NUMBER 4 c Now you see it, Now you don't: Transparency IN THIS ISSUE From the Interim Editor's Desk.....223 NEW ISSUES ARTICLES: President's Message.......................224 Botany – Christopher E. Dahle..........233 Fascinating Buttereflies with Transparent Secretary's Corner..........................224 Mammalia – Michael Prince..............242 Wings by Vladimir Kachan ...............226 News of Note.................................225 Ornithology – Glenn G. Mertz...........245 How Are Fossils Made? by Peter Voice ....229 Poczta Polska Butterflies...............241 Entomology – Donald Wright Jr........257 New Plants in the Philatelic Herbarium Brilliant Bugs from the Royal Mail...251 Paleontology – Michael Kogan........261 – Christopher Dahle...............238 Collecting by Theme: New Birds in the Philatelic Aviary Birds on Stamps by Ema Sikic ..252 – Charles E Braun...................255 Glossary ........................................272 Biology Reference Websites......................269 Index to Volume 69........................274 Renewal Form ..................Back Cover Page ii Biophilately September 2020 Vol. 69 (3) BIOPHILATELY BIOLOGY UNIT OF ATA Editor Laurie J. Ryan President Vacant 4134 Wenbrook Dr, Sharonville, OH 45241 [email protected] Associate Editors Glenn G. Mertz VicePresident Christopher E. Dahle Botany 625 N. Lafayette St., Allentown, PA 18104 1401 Linmar Dr. NE, Cedar Rapids, IA 52402 [email protected] chris[email protected] Christopher E. Dahle Secretary/Treasurer 1401 Linmar Dr. NE, Cedar Rapids, IA 52402 Dr. Paul A. Mistretta Fungi chris[email protected] 4148 Commodore Dr., Atlanta, GA 30341 Directors [email protected] Alan J. Hanks (Ontario) (President Emeritus) Michael J. Prince Mammalia John Pereira (Massachusetts) 7 Station Rd, Whitchurch, Hampshire RG28 7EP UK Dr. -
Ammonite Succession at the Bajocian/Bathonian Boundary in the Cabo Mondego Region
View metadata, citation and similar papers at core.ac.uk brought to you by CORE Ammonite succeSSIon at the Bajocian/Bathonian boundary provided by EPrints Complutense in the Cabo Mondego region (Portugal) SIXTO R. FERNANDEZ-LOPEZ, MARIA HELENA HENRIQUES AND CHARLES MANGOLD The Cabo Mondego outcrops exposed along the cliffs, on the western margin of the Iberian Plate, show an expanded strati graphic section of Lower Bathonian deposits containing abundant ammonoids. Upper Bajocian deposits correspond to similar facies, of muddy limestones alternating with marlstones, although ammonoids are scarce. A detailed succession of ammonites across the Bajocian/Bathonian boundary has been recognized at Cabo Mondego, which can form a useful bio- and chronostratigraphic standard for the Lusitanian Basin. The revision of previous collections from the classical section and new field samplings of two other separate sections allow the recognition through up to twenty metres of thickness, the highest zone of Bajocian (Parkinsoni Zone) and the lowest zone of Bathonian (Zigzag Zone). The Parkinsoni and the Zigzag zones established for NW European areas and belonging to the Northwest European Province, can be identified in the Lusitanian Basin, although the ammonite fossil assemblages are composed of Submediterranean taxa. However, a subdivision of the Parkinsoni Zone is not possible, due to the scarcity of well preserved ammonoids. The Zigzag Zone can be recognized and characterized as composed of two subunits (Parvum and Macrescens subzones) as represented in diverse European basins of the Submedi terranean Province. Ammonite fossil assemblages of the Parvum Subzone may be grouped into two successive horizons, which are biochronostratigraphically equivalent to the subdivisions of the Convergens Subzone distinguished in the Digne-Barreme area (SE France). -
Ammonites from the Latest Aalenian–Earliest Bathonian of La Baume (Castellane Area, SE France): Palaeontology and Biostratigraphy
1661-8726/08/030563-16 Swiss J. Geosci. 101 (2008) 563–578 DOI 10.1007/s00015-008-1297-6 Birkhäuser Verlag, Basel, 2008 Ammonites from the latest Aalenian–earliest Bathonian of La Baume (Castellane area, SE France): palaeontology and biostratigraphy KENNETH DE BAETS 1, 2, *, FABRIZIO CECCA 3, MYETTE GUIOMAR 4 & JACQUES VERNIERS 1 Key words: ammonites, Aalenian–Bathonian interval, France, biodiversity, taxonomy, biostratigraphy ABSTRACT Middle Jurassic strata are naturally exposed around the village called La (Parkinsoni Zone) and probably one lower Bathonian Zone (Zigzag Zone) Baume, near Castellane (Alpes de Haute Provence, SE France). We have re- were found. A major gap of both the Niortense Zone and the Garantiana alized both a detailed log and a bed-by-bed sampling for ammonite biostra- Zone, which was not previously described, was detected at the boundary be- tigraphy in a 68 metres thick succession of subpelagic marls and limestones tween members 2 and 3. The main palaeontological interest of the ammonite (“Calcaires à Zoophycos”) that spans the Middle Jurassic from uppermost fauna from La Baume is the richness and diversity of the family Sonniniidae, Aalenian to lowermost Bathonian. The subpelagic succession can be roughly which is the subject of a systematic study and figurated along with some bio- subdivided into three members. Ammonites from the Upper Aalenian Con- stratigraphically significant forms. Biostratigraphical results and open prob- cavum Zone, all Lower Bajocian Zones (Discites Zone, Laeviuscula Zone lems are discussed. including Ovale Subzone, Humpriesianum Zone), one Upper Bajocian Zone Introduction biostratigraphical subdivisions of the geological formations ex- posed. The Jurassic successions in the area of the Réserve Géologique des Alpes de Haute Provence are widely known because of Geological setting the excellent quality of the exposures, the abundance of am- monoids and the easy access.