Late Albian–Early Cenomanian stratigraphic succession near Estella-Lizarra (Navarra, central northern Spain) and its regional and interregional correlation
M.A. López-HorgueHugh OwenJulio Rodríguez‐LázaroOrue-EtxebarriaP.A. Fernández‐MendiolaJ. García‐Mondéjar
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Cenomanian
Ammonite
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Micropaleontology
In the Cenomanian shallow-water carbonates of Northwestern Istria five biostratigraphic zones have been established: CEN-1 Ovalveolina maccagnoae and Sellialveolina viallii biozone in the early Lower Cenomanian; CEN-2 O. maccagnoae to Chrysalidina gradata interval zone in the late Lower Cenomanian; CEN-3 C. gradata biozone in the early Middle Cenomanian, locally subdivided into two subzones: CEN-3a C. gradata and orbitolinids (lower part) CEN-3b C. gradata without orbitolinids (upper part); CEN-4 C. gradata and Broeckina (P.) balcanica biozone in the late Middle Cenomanian, and CEN-5 C. gradata, B. (P.) balcanica and Vidalina radoicicae biozone in the Upper Cenomanian.
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Abstract The lower–upper Cenomanian boundaries interval of the Nouader site in the Aures Basin (NE Algeria) has been studied for the first time using the association of two particularly effective taxonomic groups, one macrofossil (ammonites), and the other microfossil (foraminifera). The study section is divided into two formations (Fahdene and Bahloul) and one member (Annaba). Biostratigraphicaly, six ammonite biozones and five foraminiferan biozones were identified and calibrated. The ammonite fauna allows recognition of the lower Cenomanian Mantelliceras mantelli Zone, the upper lower Cenomanian Mantelliceras dixoni Zone, the succeeding lower middle Cenomanian Cunningtoniceras inerme Zone, the Acanthoceras rhotomagense Zone and its subzones of Turrilites costatus and Turrilites acutus , followed by the upper middle Cenomanian Acanthoceras amphibolum Zone, the lower upper Cenomanian Eucalycoceras pentagonum Zone and finally the lower Turonian Pseudaspidoceras flexuosum Zone. The foraminiferan biozones are respectively: Thalmanninella brotzeni Zone, Thalmanninella reicheli Zone, Rotalipora cushmani Zone, Whiteinella archaeocretacea Zone and Helvetoglobotruncana helvetica Zone. Among 14 ammonite zones in the Tethyan domain versus 11 in the Boreal domain, seven are common to both domains. For the planktonic foraminifera the Tethyan domain has five zones, the Boreal domain also has five, with five in common. The succession of index species occurs in the same order in both Tethyan (NE Algeria and Central Tunisia) and Boreal realms (East and NW Europe). Furthermore, the supposed depositional setting is interpreted as a calm and relatively deep environment which can be located around the middle to the external platform.
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A specimen of ammonite obtained by Toshio Shimanuki from the lower Cenomanian (Cretaceous) outcrop in the Hobetsu district of Hokkaido, northern Japan, represents a new species of Lewesiceras (Pachydiscidae). In as much as Cenomanian specimens hitherto reported under Lewesiceras have been too immature for precise generic assignment, the present specimen is large enough to reach the adult stage. It represents a new species of Lewesiceras, and shows in some respects a step in the evolutionary change of characters from late Albian Eopachydiscus to the typical Turonian species of Lewesiceras.(Contributed by Tatsuro MATSUMOTO, M. J. A., Sept. 12, 2003)
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ABSTRACT Biostratigraphic and carbon-isotope data were used to introduce a high-resolution stratigraphic reference section of the Upper Aptian to Upper Cenomanian platform carbonates of the South Palmyrides in Syria. We studied the biostratigraphic evolution of the Zbeideh to Abou-Zounnar formations in two sections, based on 42 species of benthonic foraminifera and 38 species of planktonic foraminifera. Comparisons with other Tethyan assemblages allowed determining 11 biozones; six are based on planktonic foraminifera, and five on benthonic foraminifera. Four hiatuses (earliest Albian, Middle–Late Albian, Late Albian–Early Cenomanian, and Mid Cenomanian) are marked by hardgrounds or dolomitic intervals. The planktonic biozones Ticinella bejaouaensis, T. primula, T. praeticinensis, Rotalipora subticinensis, R. globotruncanoides and R. cushmani co-occur with the following benthonic biozones: Mesorbitolina texana partial range zone, M. subconcava range zone, Neoiraqia convexa taxon-range zone, Praealveolina iberica interval zone and Pseudedomia drorimensis range zone. Within this biostratigraphic framework, a new carbon-isotope curve from the South Palmyrides was compared with δ13C records of the Tethyan Realm and England that allows identifying several biotic events and Oceanic Anoxic Events (OAE), recorded in the Upper Albian to Upper Cenomanian succession. The combination of sequence-stratigraphic interpretations and comparisons, with our results have led to an improved understanding of the Cretaceous platform architecture of the South Palmyrides that links the Arabian Platform to the east with the Levant Platform to the southwest.
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Ammonite biostratigraphy and its correlation potential are evaluated for Ataxioceras-bearing deposits in the eastern Iberian Range, E–NE Spain. The Chronostratigraphic Standard Hypselocyclum Zone of sub-Mediterranean areas is analysed. Correlation of the new Ataxioceras lothari Biozone is proposed utilising first appearance datum (FAD)-based biostratigraphy, resulting from a review of ammonite (Ataxioceratinae) systematics. The lower boundary of the A. lothari Biozone and its chronostratigraphic equivalent Lothari Chronozone are defined by the FAD of Ataxioceras Fontannes s.s., and their upper boundaries by the FAD of Crussoliceras Enay. Distinction of the sub-biozones (subzones) A. hippolytense and A. lothari is confirmed, but these units are slightly reinterpreted. No ammonite subdivisions are defined for the A. hippolytense subzone, although two informal "intra-subzone biodivisions" (A. lothari and Geyericeras aragoniense) are recognised within the A. lothari subzone, the latter defined for the first time. The correlation potential of the proposed biostratigraphic scheme (zone and intra-zone levels using Ataxioceratinae) is high for marine successions from both epicontinental and oceanic-fringe environments under Tethyan influence (southern Europe and north-western Africa). The potential for correlation at the intra-zone level is higher for epicontinental than for oceanic-fringe areas; yet the precise correlation of some biostratigraphic boundaries is difficult at the "intra-subzone biodivision" level between the eastern Iberian Range and SE France. Updated identification and subdivision of the equivalent Metahaploceras strombecki Biozone in oceanic-fringe sections are presented, together with this unit's correlation potential with respect to the proposed A. lothari Biozone.
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New palaeontological and biostratigraphic data from the Cenomanian–Turonian deposits of the western Saharan Atlas are presented in this study. More than 300 specimens of ammonites were collected from Kebeur es Seguia and Aïn El Orak sections, representing the Rhoundjaïa Formation. With the exception of the three ammonites previously described from the western Saharan Atlas by former authors [namely Neolobites vibrayeanus (d'Orbigny), Vascoceras gamai Choffat and Vascoceras cauvini Chudeau], nine additional ammonite species [Calycoceras (Calycoceras) cf. naviculare (Mantell), Eucalycoceras cf. pentagonum (Jukes-Brown), Metoicoceras geslinianum (d'Orbigny), Nigericeras gadeni (Chudeau), Fikaites subtuberculatus (Collignon), Pseudaspidoceras pseudonodosoides (Choffat), Fagesia peroni Pervinquière, Fagesia tevesthensis (Peron) and Choffaticeras (Choffaticeras) sinaiticum (Douvillé)] are described and illustrated from the studied area. Biostratigraphic analysis revealed four ammonite biozones; three from the late Cenomanian namely, the Neolobites vibrayeanus Total Range Zone, the Metoicoceras geslinianum Total Range Zone and the Vascoceras cauvini Total Range Zone; and one from the early Turonian (earliest Turonian), the Choffaticeras sinaiticum Total Range Zone. The recognised ammonite zones demonstrate a significant palaeobiogeographical relationship between the studied area and other countries of North Africa, the Middle East, South America and southern Europe.
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