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1

Corbinites (Subfamily Lithacoceratinae), a new genus for the giant western Canadian Late Kimmeridgian or Tithonian (Late Jurassic) ammonite Titanites occidentalis Frebold

Poulton Terence P.

Volumina Jurassica

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2023

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Vol. 21

27--38

EN

The finding of two new specimens and a reappraisal of the single original specimen of the problematic giant Canadian Late Ju- rassic ammonite Titanites occidentalis Frebold results in the creation of Corbinites, n. gen. It is assigned to the ataxioceratid subfamily Lithacoceratinae largely because of the presence of variocostate and previously unrecognized ataxioceratoid ribbing in middle and late growth stages. With enigmatic ancestry and geographically removed other forms with similar characteristics, the species may have been endemic in the relatively isolated early Alberta foreland basin of western interior Canada.

2

Biostratigraphy and sequence stratigraphy of the Lower Cretaceous in the NW part of the Mid-Polish Trough

Dziadzio Piotr, Ploch Izabela, Smoleń Jolanta

Geological Quarterly

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2021

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Vol. 65, No. 4

s. 237--257

EN

By comparison with the Lower Cretaceous of central and SE Poland, that of NW Poland (the Pomeranian, Szczecin, and Mogilno-Łódź troughs) has scarce biostratigraphic data. But, despite the lack of Lower Cretaceous exposure in the NW Polish Lowlands, borehole data, including borehole-cores and geophysical logs, allow analysis of complete successions. We refine the stratigraphic units using parallel studies of ammonites, microfauna and calcareous nannoplankton collected from the same intervals, and by correlating age-defined intervals with geophysical logs. Ostracod zones F to A are documented by the presence of ostracod assemblages representing the interval between the Upper Tithonian (ostracod zone F) and the lower part of the Upper Berriasian (ostracod zones E to A). The fragmentary and poorly preserved ammonites allowed only for distinguishing the uppermost Middle and Upper Berriasian (Ryazanian), while the informal subdivisions from the central part of the basin could not be identified unequivocally. Nannoplankton recognized in the succession analysed was very rare due to shallow marine facies of the strata. Only one nannoplankton zone was recognized in the lower part of the succession studied: the CC2 Stradneria crenulata Zone (uppermost Middle and Upper Berriasian and lowermost Valanginian). An additional study only on nannoplankton enabled recognition of certain boreal taxa typical of the BC2 zone of the Uppermost Riazanian. Valaginian ammonites occur in core material located closer to the central part of the trough. Some planktonic foraminiferal species indicate the Lower Aptian. Some Upper Cretaceous nannoplankton zones were also recognized: the CC9 Eiffellithus turriseiffeli (Uppermost Albian to Lower Cenomanian) and UC0, UC1-2 and UC3 zones which correspond to the Upper Albian and Lower as well as Middle Cenomanian. The sequence stratigraphic interpretation was based on geophysical logs with the application of gamma-ray, neutron-gamma, spontaneous potential and resistivity logging, as well as caliper logging. These studies allowed recognition and correlation of sedimentary sequences within the part of the sedimentary basin analysed, characterized by a similar cyclic pattern of geological phenomena described using depositional sequences as in the central and SE part of the Polish Basin. Third-order depositional sequences with maximum flooding surfaces were distinguished. Effective correlation of depositional cycles with biostratigraphy and with the global sea level curve was demonstrated for several boundaries, confirming the applicability of this method for the Polish part of the the Central-European Basin. Other boundaries recognized that are not correlatable and shifted relative to Haq’s curve may reflect autogenous factors (e.g., local tectonics) overlapping with the global changes controlled by allogenic processes.

3

Mosasauroid predation on an ammonite – Pseudaspidoceras – from the Early Turonian of south-eastern Morocco

Gale A. S., Kennedy W. J., Martill D.

Acta Geologica Polonica

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2017

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Vol. 67, no. 1

31--46

EN

A juvenile specimen of the ammonite Pseudaspidoceras from the Early Turonian of the Goulmima area in the Province of Er-Rachida in south-eastern Morocco shows clear evidence of predation by a tooth-bearing verte-brate. Most of the body chamber is missing, as a result of post-burial compactional crushing. The adapertural part of the shell on the left flank of the surviving fragment of body chamber bears six circular punctuations; the right flank four. These are interpreted as the product of a single bite by a mosasauroid, probably a Tethysaurus. The taxonomy of the Goulmima Pseudaspidoceras is discuused in an appendix.

4

The lower and middle Berriasian in Central Tunisia: Integrated ammonite and calpionellid biostratigraphy of the Sidi Kralif Formation

Maalaoui K., Zargouni F.

Acta Geologica Polonica

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2016

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Vol. 66, no. 1

43--58

EN

The lower and middle Berriasian sedimentary succession of the Sidi Kralif Formation has been a subject of biostratigraphic study in two key sections in Central Tunisia. Our contribution is an attempt to better define the basal Berriasian interval, between the Berriasella jacobi Zone and the Subthurmannia occitanica Zone. Zonal schemes are established using ammonites and calpionellids, and these permit correlation with other regions of Mediterranean Tethys and beyond. The use of biomarkers afforded by microfossil groups has allowed characterization and direct correlation with four widely accepted calpionellid sub-zones, namely Calpionella alpina, Remaniella, Calpionella elliptica and Tintinopsella longa. The two ammonite zones of Berriasella jacobi and of Subthurmannia occitanica are recognised on the basis of their index species. The parallel ammonite and calpionellid zonations are useful as a tool for correlation and calibration in time and space, thus allowing a better definition of a J/K boundary. The presence of four Berriasian calpionellid bioevents is recognised: (1) the ‘explosion’ of Calpionella alpina, (2) the first occurrence of Remaniella, (3) the first occurrence of Calpionella elliptica and (4) the first occurrence of Tintinopsella longa. The last is here documented as coeval with the presence of Subthurmannia occitanica, which marks the lower/middle Berriasian boundary.

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The ammonite genus Prionocycloceras Spath, 1926, from the Coniacian of KwaZulu-Natal, South Africa

Klinger H. C., Kennedy W. J.

Acta Geologica Polonica

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2016

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Vol. 66, no. 4

663--669

EN

Subprionocyclus latiumbilicatus Van Hoepen, 1968, and Subprionocyclus obesus Van Hoepen, 1968, are revised, and referred to Prionocycloceras Spath, 1926, a genus not previously recognised from the South African Cretaceous. The material comes from the Middle and Upper Coniacian St Lucia Formation of northern KwaZulu-Natal.

6

In his own words

Johnson K., Baysinger D., Cobban W. A.

Acta Geologica Polonica

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2016

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Vol. 66, no. 4

III-XIII

EN

Bill Cobban in conversation with Kirk Johnson and Dave Baysinger, 19 February, 2010.

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The Pliensbachian/Toarcian boundary in the Lower Jurassic Toyora Group in southwest Japan

Nakada K., Matsuoka A.

Volumina Jurassica

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2006

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Vol. 4, no. 1

197-197

EN

The Toyora Group is the continental shelf sediment exposed in the western part of Yamaguchi Prefecture, southwest Japan. It is mainly composed of sandstone and mudstone, and divided into three formations, that is, the Higashinagano, the Nishinakayama, and the Utano formations in ascending order. The Sakuraguchidani Mudstone Member, the lower part of the Nishinakayama Formation, is rich in ammonoids. Almost all ammonite specimens examined are classified into Hildocerataceae, and indicate successive ages from Upper Pliensbachian to Lower Toarcian. Hirano (1973) established three ammonite zones, in ascending order, the Fontanellense Zone, the Nipponicum Zone, and the Helianthoides Zone, and defined the Pliensbachian/Toarcian boundary within the P. nipponicum Zone. Furthermore, the black shale, a main component of the member, is known as a layer representing global Early Toarcian Ocean Anoxic Event (Tanabe 1991). The purpose of this study is to revise the Pliensbachian/Toarcian boundary in the Lower Jurassic Toyora Group by adopting the recently established global standard. Along the Sakuraguchidani route, the type locality of the Sakuraguchidani Mudstone Member, 99 ammonite specimens including 11 genera and 16 species were collected. The ammonite fauna is characterized by the abundance of Dactylioceras helianthoides (Yokoyama), Protogrammoceras nipponicum (Matsumoto), and Cleviceras chrysanthemum (Yokoyama). Paltarpites paltus (Buckman) and Fontanelliceras fontanellense (Gemmellaro) were obtained from this member. The Pliensbachian/Toarcian boundary is determined by adopting the definition which is used in Europe (e.g. Macchioni 2002). Among the various indexes, the first appearance of the genus Dactylioceras and P. paltus, mainly used in the Mediterranean area, is the most suitable for the Toyora Group. The boundary is drawn within the Fontanellense Zone, 23 m lower than that in the previous studies (Hirano 1973; Tanbe 1991). The Toyora Group has high potential for elucidating the timing of the Toarcian Ocean Anoxic Event off eastern Asia.

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Callovian to Berriasian pelagic carbonates in the Western Fore-Balkan, Bulgaria: microfacies, ammonite and microfossil zonations

Ivanova D., Koleva-Rekalova E., Lakova I., Metodiev L.

Volumina Jurassica

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2006

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Vol. 4, no. 1

175-177

EN

The Callovian to Berriasian pelagic carbonates in the Western Fore-Balkan crop out as a part of the Middle Jurassic – Lower Cretaceous peri-platform marine sediments deposited on the northern Tethyan continental margin. This pelagic record consists of marl-limestone alternation (Bov Formation), grey micritic limestones with reddish nodular limestones (Javorets Formation), Ammonitico Rosso type red nodular limestones (Gintsi Formation) and Biancone-type grey micritic regularly bedded limestones (Glozhene Formation) (Sapunov 1976). The total thickness of this succession exceeds 400 m. Rich ammonite faunas recorded from the Bov, Javorets and Gintsi Formations enabled ammonite zonation and age assignment: Macrocephalites spp., Hecticoceras spp. and Kosmoceras spp. zones (Callovian), P. athletoides, C. renggeri, P. (D.) episcopallis, P. (D.) antecedens and G. riazi zones (Oxfordian), H. beckeri zone (Upper Kimmeridgian) and H. hybonotum, S. schwertschlageri and V. rothpletzi zones (Tithonian). The stratigraphic distribution and relative abundance of pelagic microplankton organisms (thin-shelled bivalves, planktonic foraminifers, radiolarians, calcareous dinocysts, pelagic echinoderms and calpionellids) have been used for biostratigraphy and/or recognition of microbiofacies. Within the Oxfordian- Berriasian interval the calcareous dinocyst zones: C. fibrata, C. borzai, C. tithonica, P. malmica, C. tenuis, C. fortis, St. proxima and St. wanneri are recorded. The Middle Tithonian to Berriasian interval is characterized by the successive calpionellid zones: Chitinoidella, Praetintinnopsella, Crassicollaria, Calpionella and Calpionellopsis (Lakova et al. 1999). Five microbiofacies within the pelagic carbonates are superposed: mudstone and wackestone with filaments of pelagic bivalves (Callovian), Globuligerina wackestone and radiolarian wackestone [Oxfordian-Kimmeridgian(?)], Saccocoma wackestones (Kimmeridgian – Lower Tithonian) Globochaete mudstone (Middle Tithonian) and calpionellid mudstone (Upper Tithonian and Berriasian) (Fig. 1). The estimated average rate of sedimentation within the Callovian-Berriasian pelagic succession in the Western Fore-Balkan varying from 9 to 26 mm/10 3 years is characteristic for the transition from relatively condensed to stratigraphically expanded sections in the Upper Jurassic of the Tethyan region. This rate is lower during the Callovian to Kimmeridgian and increased significantly in the Tithonian and Berriasian. Probable explanations are partial carbonate dissolution of the red nodular limestones in the Late Jurassic and the increased bioproductivity of nannoplankton in the Berriasian.

9

Oxfordian and Kimmeridgian of the northeastern margin of the Holy Cross Mountains, Central Poland

Gutowski J.

Kwartalnik Geologiczny

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1998

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Vol. 42, nr 1

59-72

EN

In Late Jurassic the area of Central Poland was a part of the northern Tethyan shelf which developed in the margins of the East European Craton. The present day NE margin of the Holy Cross Mountains was situated in a proximal part of thhis shelf. The Oxfordian sedimentationbegan with open shelf, sponge-algal mudstones of the mariae, cordatum, and plicatilis Zones. During the latest transversarium and bifurcatus Chrons, shallow water biogenic and oncolitic facies developed. They were, in turn, replaced during the Late Oxfordian and the Early Kimmeridigian by oolitic-bioclastic grainstones and laminites. During the divisum Chron and the Late Kimmeridgian oyster shellbeds and clays were deposited. Within the studied sequence thirteen lithostratigraphic units are esablished and described. The collected ammonite fauna document the following ammonite zones: mariaem cordatum, plicatilis, transversarium, bifurcatus, planula, hypselocyclum and divisum.

PL

Opracowanie przedstawia syntezę lito- i biostratygrafii utworów górnojurajskich północno-wschodniego obrzeżenia Gór Świętokrzyskich odsłaniających się między Dobrutem i Wierzbicą, w okolicach Iłży, w dolinie Kamiennej od Przepaści, przez Bałtów po Skarbkę oraz nad Wisłą w Zawichoście i Rachowie. Na podstawie 76 profili z odsłonięć i otworów wiertniczych wyróżniono 13 nieformalnych jednostek stratygraficznych. Obejmują one zarówno osady dolnego i niższej części środkowego oksfordu wykształcone w facji gąbkowej i mikrytowej otwartego szelfu, jak i utwory płytkowodnej facji platformy węglanowej, tworzone od przełomu poziomów transversarium i bifurcatus, a wykształcone początkowo jako wapienie biogeniczne z koralami, a następnie wapienie onkolitowe, oolitowe oraz laminaty i wreszcie (od poziomu divisum) - muszlowce ostrygowe i margle. Na podstawie kolekcji amonitów obejmującej 94 okazy udokumentowano następujące poziomy amonitowe: mariae, cordatum, plicatilis, transversarium, bifurcatus, planula, hypsalocyclum oraz divisum. W wyniku neokimeryjskiego ścięcia erozyjnego utwory neokomu lub albu kontaktują z różnymi ogniwami górnej jury. Najgłębiej neokimeryjska erozja sięgnęła w rejonie Ożarowa, gdzie piaskowce albu kontaktują bezpośrednio z muszlowcami ostrygowymi poziomu divisum.

10

The Turonian - Coniacian boundary in the United States Western Interior

Walaszczyk I., Cobban W.

Acta Geologica Polonica

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1998

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Vol. 48, no. 4

495-507

EN

The Turonian/Coniacian boundary succession in the United States Western Interior is characterized by the same inoceramid faunas as recognized in Europe, allowing the application of the same zonal scheme in both regions; Mytiloides scupini and Cremnoceramus waltersdorfensis zones in the tompost Turonian and Cremnoceramus deformis erectus Zone in the lowermost Coniacian. The correlation with Europe is enhanced, moreover, by a set of boundary events recognized originally in Europe and well represented in the Western Interior: Didymotis I Event and waltersdorfensis Event in the tompost Turonian, and erectus I, II and ?III events in the Lower Coniacian. First "Coniacian" ammonite, Forresteria peruana, appears in the indisputable Turonian, in the zone of M. scupini, and the reference to Forresteria in the boundary definition should be rejected. None of the North American sections, proposed during the Brussels Symposium as the potential boundary stratotypes, i.e. Wagon Mound and Pueblo sections, appears better than the voted section of the Salzgitter-Salder. The Pueblo section is relatively complete but markedly condensed in comparison with the German one, but it may be used as a very convenient reference section for the Turonian/Coniacian boundary in the Western Interior. The Wagon Mound section was mis-interpreted in respect of its biostratigraphical position and is entirely of Late Turonian age.

11

Biostratigraphy and correlation of the Turonian - Coniacian succession and the Turonian - Coniacian boundary problem in the Far East Russia based on ammonites and inoceramids

Zonova T., Jazykova-Flidlider E.

Acta Geologica Polonica

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1998

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Vol. 48, no. 4

483-494

EN

The stratigraphy, ammonite and inoceramid content of the Turonian - Coniacian deposits of Far East Russia are presented. The evolution of North Pacific ammonites and inoceramids at the boundary of the two stages was studied and the levels of fundamental changes within the ammonite and inoceramid biota are recognized. The established palaeogeographic difference between the Sakhalin and the North-East region palaeobasins is reflected in the existence of two independent local zonal schemes. The main criteria of the Turonian-Coniacian stage boundary in the Far East of Russia were established on the basis of the two schemes. The Turonian/Coniacian (T/C) boundary is clearly marked by the change in the taxonomic diversity of the zonal inoceramid assemblages. It is defined at the base of the Inoceramus uwajimensis Zone. The appearance of the endemic ammonite species. Jimboiceras mihoense MATSUMOTO is the ammonite criterion for recognising the T/C stage boundary in Sakhalin. This is supported by occurrences of the cosmopolitan Coniacian genera Peroniceras and Forresteria.