The Experts below are selected from a list of 7491 Experts worldwide ranked by ideXlab platform
Michael Wagreich - One of the best experts on this subject based on the ideXlab platform.
-
The Santonian–campanian boundary and the end of the long cretaceous normal polarity-chron: Isotope and plankton stratigraphy of a pelagic reference section in the NW tethys (Austria)
Newsletters on Stratigraphy, 2018Co-Authors: Erik Wolfgring, Michael Wagreich, Jaume Dinarès-turell, Katharina Böhm, Susanne Gier, Benjamin Sames, Christoph Spötl, Friedrich PoppAbstract:The base of the Campanian still lacks a designated primary marker and a defined GSSP (Global Boundary Stratotype Section and Point). We present a Santonian–Campanian boundary section from the Postalm in the Northern Calcareous Alps of Austria as a possible reference section for the northwestern Tethys. Including nearby complementary Gosau Group sections, the stratigraphy for this time interval is based on palaeomagnetic and stable isotope data, planktonic foraminifera and calcareous nannoplankton bio-stratigraphy, and strontium isotope stratigraphy, together with published ammonite, crinoid and inoceramid data. The Postalm section shows a deepening trend from upper Santonian conglomerates and grey shelf marls to pelagic bathyal red marly limestones of mainly Campanian age. Palaeomagnetic data allow identifying the top of the Long Cretaceous Normal Polarity-Chron C34n and the following reversal in the lower part of the red marly limestones. A 1 m-thick interval of high magnetic susceptibility is present at the end of C34n. Two of the main suggested biomarkers to pinpoint the Santonian–Campanian boundary, i. e. the last occurrence of the planktonic foraminifer Dicarinella asymetrica and the first occurrence of the nannofossil Broinsonia parca parca, occur in close proximity above the reversal, which is suggested herein as the main marker event for the base of the Campanian. Strontium isotope stratigraphy indicates a value of 0.707534 (mean of four measurements at the boundary interval) for the base of the Campanian in the Postalm section. Both carbon and oxygen isotope values show a negative excursion just below the boundary. The positive Santonian–Campanian carbon isotope event starts probably just below the reversal but seems to be diagenetically distorted. This interval is considered to correspond to a short sea-level high in the late Santonian followed by a distinct lowstand at the Santonian–Campanian boundary.
-
the Santonian campanian boundary and the end of the long cretaceous normal polarity chron isotope and plankton stratigraphy of a pelagic reference section in the nw tethys austria
Newsletters on Stratigraphy, 2018Co-Authors: Erik Wolfgring, Michael Wagreich, Katharina Böhm, Susanne Gier, Benjamin Sames, Christoph Spötl, Jaume Dinaresturell, Friedrich PoppAbstract:The base of the Campanian still lacks a designated primary marker and a defined GSSP (Global Boundary Stratotype Section and Point). We present a Santonian–Campanian boundary section from the Postalm in the Northern Calcareous Alps of Austria as a possible reference section for the northwestern Tethys. Including nearby complementary Gosau Group sections, the stratigraphy for this time interval is based on palaeomagnetic and stable isotope data, planktonic foraminifera and calcareous nannoplankton bio-stratigraphy, and strontium isotope stratigraphy, together with published ammonite, crinoid and inoceramid data. The Postalm section shows a deepening trend from upper Santonian conglomerates and grey shelf marls to pelagic bathyal red marly limestones of mainly Campanian age. Palaeomagnetic data allow identifying the top of the Long Cretaceous Normal Polarity-Chron C34n and the following reversal in the lower part of the red marly limestones. A 1 m-thick interval of high magnetic susceptibility is present at the end of C34n. Two of the main suggested biomarkers to pinpoint the Santonian–Campanian boundary, i. e. the last occurrence of the planktonic foraminifer Dicarinella asymetrica and the first occurrence of the nannofossil Broinsonia parca parca, occur in close proximity above the reversal, which is suggested herein as the main marker event for the base of the Campanian. Strontium isotope stratigraphy indicates a value of 0.707534 (mean of four measurements at the boundary interval) for the base of the Campanian in the Postalm section. Both carbon and oxygen isotope values show a negative excursion just below the boundary. The positive Santonian–Campanian carbon isotope event starts probably just below the reversal but seems to be diagenetically distorted. This interval is considered to correspond to a short sea-level high in the late Santonian followed by a distinct lowstand at the Santonian–Campanian boundary.
-
Plankton biostratigraphy and magnetostratigraphy of the Santonian–Campanian boundary interval in the Mudurnu–Göynük Basin, northwestern Turkey
Cretaceous Research, 2018Co-Authors: Erik Wolfgring, Michael Wagreich, Jaume Dinarès-turell, Ismail Omer Yilmaz, Katharina BöhmAbstract:Abstract The Santonian–Campanian boundary interval close to the village of Goynuk in northwestern Turkey (Bolu province) was recorded and examined with respect to nannofossil and foraminiferal biostratigraphy, magnetic polarity and magnetic susceptibility. During the Late Cretaceous, the Mudurnu–Goynuk Basin was located on the Sakarya continent situated in the northwestern Tethyan Realm, north of the Neo-Tethys. The sections assessed for the present study comprise hemipelagic to pelagic deposits. Five localities were examined and a composite record spanning the Santonian–Campanian boundary was established. The stratigraphically older parts are characterised by uniform reddish limestone, while we frequently recorded shaly marls and marly limestones with recurrent tuff intercalations in the younger subsections. A biostratigraphic investigation of planktonic foraminifera and calcareous nannoplankton assemblages, together with magnetostratigraphy, provides a stratigraphic framework that allows to home in on the Santonian–Campanian boundary. Thus, biostratigraphic data suggest an age that ranges from the late Santonian Dicarinella asymetrica to the early Campanian Globotruncanita elevata planktonic foraminifera biozones, and calcareous nannofossil zones UC12–UC14 and CC16–CC18. The magnetostratigraphic assessment finds a palaeomagnetic reversal that can be recognised as the basal Campanian reversal C33r above polarity chron 34n, the Long Cretaceous Normal. Field magnetic susceptibility (MS) data show a distinct cyclic pattern in the lower Campanian. Sinusoidal patterns in the MS signature curve can presumably be interpreted as the 400 kyr orbital eccentricity cycle, and subsequent smaller-scale cycles of obliquity and precession can be identified even though volcanic activity impacted sedimentation. A sediment accumulation rate of 12 mm/kyr can be inferred for one of the sections.
-
The upper Coniacian to upper Santonian drowned Arabian carbonate platform, the Mardin-Mazidag area, SE Turkey: Sedimentological, stratigraphic, and ichthyofaunal records
Cretaceous Research, 2018Co-Authors: Ismail Omer Yilmaz, Michael Wagreich, Todd D. Cook, Izzet Hoşgör, Katherine Rebman, Alison M. MurrayAbstract:Abstract A measured stratigraphic section including the upper Coniacian – upper Santonian interval in the Mardin-Mazidag area in Southeastern Turkey lies on the Arabian Platform and documents the drowning of the Arabian platform. The studied succession transgressively overlies the exposed carbonate platform and exhibits a relatively condensed sequence characterized by presence of fish remains, phosphate nodules, oncoids, phosphatic fragments, glauconites and planktonic foraminifera. Calcareous nannofossils attest a late Coniacian to late Santonian age (zones UC11 UC12). Numerous elasmobranch teeth are also present in this pelagic facies, representing mackerel sharks ( Squalicorax, Pseudocorax and Scapanorhynchus ) and a ray ( Ctenopristis ). The presence of pelagic facies and phosphate deposits on the drowned platform may indicate a sudden rise of sea level and increase of nutrient due to upwelling currents. The collapse parts of the Arabian carbonate platform occurred earlier than previously reported, starting from late Coniacian-Santonian onwards.
-
Tethyan plankton bioevents calibrated to stable isotopes across the upper Santonian–lower Campanian transition in north-western Tunisia
Cretaceous Research, 2018Co-Authors: Sherif Farouk, Mahmoud Faris, Zaineb Elamri, Fayez Ahmad, Michael WagreichAbstract:Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13 to CC21/UC15c) equivalent to three planktonic foraminiferal zones named Dicarinella asymetrica, Globotruncanita elevata , Globotruncana ventricosa . The Santonian/Campanian Boundary Event (SCBE) is characterized by a positive δ 13 C double peaks. The first peak (a) occurs within the uppermost CC17 Zone and Dicarinella asymetrica Zone. The second peak (b) directly occurs below the base of CC18 (FO of Bronsonia parca parca ) and last occurrence (LO) of Dicarinella asymetrica . It is marked by several extinction bioevents of representatives of Whiteinella , Dicarinella and Sigalia and the gradual disappearance of species of Marginotruncana (all species except M. sinuosa and M. marginata ). At the beginning of the Campanian a diversification of Globotruncanidae was noted.
William A. Cobban - One of the best experts on this subject based on the ideXlab platform.
-
inoceramid fauna and biostratigraphy of the upper middle coniacian lower middle Santonian of the pueblo section se colorado us western interior
Cretaceous Research, 2007Co-Authors: Ireneusz Walaszczyk, William A. CobbanAbstract:The Middle Coniacian to Middle Santonian inoceramid succession of the Pueblo section, southeastern Colorado, US Western Interior, is reviewed in the context of the zonal scheme applied in Europe. The Middle Coniacian record starts with the upper Middle Coniacian Volviceramus involutus Zone, because the base of the succession is characterised by a hitherto unsuspected stratigraphical gap, spanning the topmost Lower and lower Middle Coniacian in European inoceramid terms. The base of the Upper Coniacian is recognised by the entry of Magadiceramus; this substage is divided into a Magadiceramus subquadratus Interval Zone and a Magadiceramus crenelatus Taxon Range Zone. The base of the Santonian is taken at the base of the Cladoceramus undulatoplicatus Taxon Range Zone. The Middle Santonian is assigned to the Cordiceramus bueltenensis Zone, and the base of the Upper Santonian is placed at the base of the zone of Cordiceramus muelleri. The inoceramid faunas of the Pueblo succession are similar to those known from southern Europe, south of the regular occurrence of sphenoceramids. The apparent differences reported in the previous literature between the inoceramid faunas of Europe and of the Western Interior at this level resulted mainly from differences in the taxonomic concepts applied. The new data enable correlation between the proposed inoceramid zonal scheme and the scaphitid ammonite zones.
-
Inoceramid fauna and biostratigraphy of the upper Middle Coniacian–lower Middle Santonian of the Pueblo Section (SE Colorado, US Western Interior)
Cretaceous Research, 2007Co-Authors: Ireneusz Walaszczyk, William A. CobbanAbstract:The Middle Coniacian to Middle Santonian inoceramid succession of the Pueblo section, southeastern Colorado, US Western Interior, is reviewed in the context of the zonal scheme applied in Europe. The Middle Coniacian record starts with the upper Middle Coniacian Volviceramus involutus Zone, because the base of the succession is characterised by a hitherto unsuspected stratigraphical gap, spanning the topmost Lower and lower Middle Coniacian in European inoceramid terms. The base of the Upper Coniacian is recognised by the entry of Magadiceramus; this substage is divided into a Magadiceramus subquadratus Interval Zone and a Magadiceramus crenelatus Taxon Range Zone. The base of the Santonian is taken at the base of the Cladoceramus undulatoplicatus Taxon Range Zone. The Middle Santonian is assigned to the Cordiceramus bueltenensis Zone, and the base of the Upper Santonian is placed at the base of the zone of Cordiceramus muelleri. The inoceramid faunas of the Pueblo succession are similar to those known from southern Europe, south of the regular occurrence of sphenoceramids. The apparent differences reported in the previous literature between the inoceramid faunas of Europe and of the Western Interior at this level resulted mainly from differences in the taxonomic concepts applied. The new data enable correlation between the proposed inoceramid zonal scheme and the scaphitid ammonite zones.
-
Paleontology and stratigraphy of upper Coniacian–middle Santonian ammonite zones and application to erosion surfaces and marine transgressive strata in Montana and Alberta
Cretaceous Research, 2005Co-Authors: William A. Cobban, T.s. Dyman, K.w. PorterAbstract:Abstract Erosional surfaces are present in middle and upper Coniacian rocks in Montana and Alberta, and probably at the base of the middle Santonian in the Western Interior of Canada. These erosional surfaces are biostratigraphically constrained using inoceramid bivalves and ammonites, which are used to define lower, middle, and upper substages of both the Coniacian and Santonian stages of the Upper Cretaceous in this region. The most detailed biostratigraphy associated with these erosional surfaces concerns the MacGowan Concretionary Bed in the Kevin Member of the Marias River Shale in Montana, where the bed lies disconformably on middle or lowermost upper Coniacian strata, and is overlain by upper Coniacian beds. Surface and subsurface investigations in west-central Alberta reveal that the Bad Heart Formation, bounded by unconformities, is about the age of the MacGowan Concretionary Bed. Coniacian and Santonian strata are present elsewhere in Alberta and adjoining areas, but little has been published concerning the Santonian megafossils.
-
Upper Cretaceous (upper Santonian) Boehmoceras fauna from the Gulf Coast region of the United States
Geological Magazine, 1991Co-Authors: W. J. Kennedy, William A. CobbanAbstract:AbstractAn upper Santonian fauna dominated by the curved baculitid Boehmoceras Riedel, 1931, occurs as phosphatic moulds in the Tombigbee Sand Member of the Eutaw Formation in Mississippi and Alabama, and also is reworked into the base of the Mooreville Chalk; a similar assemblage is present in the middle part of the Pen Formation of the Big Bend area, Texas. The assemblage is: Pseudoschloenbachia (Pseudoschloenbachia) mexicana (Renz, 1936), Placenticeras syrtale (Morton, 1834), Reginaites leei (Reeside, 1927a), Reginaites exilis sp. nov., Texanites (Texanites) sp. juv. cf. gallicus Collignon, 1948, Texanites (Plesiotexanites) shiloensis Young, 1963, Texanitinae incertae sedis, Hyphantoceras (?) amapondense (van Hoepen, 1921).Glyptoxoceras spp., Boehmoceras arculus (Morton, 1834) and Scaphites (Scaphites) leei Reeside, 1927a, form I. The assemblage is referred to the uppermost Santonian Texanites (Plesiotexanites) shiloensis zone of the Gulf Coast sequence. Common occurrence of Scaphites (S.) leei I and Reginaites leei suggest correlation with the Upper Santonian Desmoscaphites erdmanni zone of the U.S. Western Interior; common occurrence of Boehmoceras arculus (= B. loescheri of European authors) suggests correlation with the Marsupites–granulata zone at the top of the North German Santonian. These data strengthen intercontinental correlation of the Santonian–Campanian boundary sequence. They also provide a biostratigraphic link to a numerical age of 84.2±0.9 Ma from a bentonite at a slightly lower level in the Tombigbee Sand Member of the Eutaw Formation in Mississippi.
Sherif Farouk - One of the best experts on this subject based on the ideXlab platform.
-
Tethyan plankton bioevents calibrated to stable isotopes across the upper Santonian–lower Campanian transition in north-western Tunisia
Cretaceous Research, 2018Co-Authors: Sherif Farouk, Mahmoud Faris, Zaineb Elamri, Fayez Ahmad, Michael WagreichAbstract:Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13 to CC21/UC15c) equivalent to three planktonic foraminiferal zones named Dicarinella asymetrica, Globotruncanita elevata , Globotruncana ventricosa . The Santonian/Campanian Boundary Event (SCBE) is characterized by a positive δ 13 C double peaks. The first peak (a) occurs within the uppermost CC17 Zone and Dicarinella asymetrica Zone. The second peak (b) directly occurs below the base of CC18 (FO of Bronsonia parca parca ) and last occurrence (LO) of Dicarinella asymetrica . It is marked by several extinction bioevents of representatives of Whiteinella , Dicarinella and Sigalia and the gradual disappearance of species of Marginotruncana (all species except M. sinuosa and M. marginata ). At the beginning of the Campanian a diversification of Globotruncanidae was noted.
-
tethyan plankton bioevents calibrated to stable isotopes across the upper Santonian lower campanian transition in north western tunisia
Cretaceous Research, 2017Co-Authors: Sherif Farouk, Mahmoud Faris, Zaineb Elamri, Fayez Ahmad, Michael WagreichAbstract:Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13 to CC21/UC15c) equivalent to three planktonic foraminiferal zones named Dicarinella asymetrica, Globotruncanita elevata , Globotruncana ventricosa . The Santonian/Campanian Boundary Event (SCBE) is characterized by a positive δ 13 C double peaks. The first peak (a) occurs within the uppermost CC17 Zone and Dicarinella asymetrica Zone. The second peak (b) directly occurs below the base of CC18 (FO of Bronsonia parca parca ) and last occurrence (LO) of Dicarinella asymetrica . It is marked by several extinction bioevents of representatives of Whiteinella , Dicarinella and Sigalia and the gradual disappearance of species of Marginotruncana (all species except M. sinuosa and M. marginata ). At the beginning of the Campanian a diversification of Globotruncanidae was noted.
-
Integrated microfossil biostratigraphy, facies distribution, and depositional sequences of the upper Turonian to Campanian succession in northeast Egypt and Jordan
Facies, 2016Co-Authors: Sherif Farouk, Fayez Ahmad, John H. Powell, Akmal M. MarzoukAbstract:Six upper Turonian to Campanian sections in Egypt (Sinai) and Jordan were studied for their microfossil biostratigraphy (calcareous nannofossils and planktonic foraminifera), facies distribution and sequence stratigraphic frameworks. Carbonate (mostly chalk) and chert lithofacies dominate the basinward northern sections passing laterally and vertically to mixed carbonate/siliciclastic lithofacies towards the shoreline in the southeast. Twenty-six lithofacies types have been identified and grouped into six lithofacies associations: littoral siliciclastic facies belt; peritidal carbonate; intertidal carbonate platform/ramp; high-energy ooidal shoals and shelly biostromes; shallow subtidal; and pelagic facies association. The following calcareous nannofossil biozones were recognized: Luianorhabdus malefomis (CC12) (late Turonian), Micula staurophora (CC14) (early Coniacian), Reinhardtites anthophorus (CC15) (late Coniacian), Lucianorhabdus cayeuxii (CC16) (early Santonian) and Broinsonia parca parca (CC18) (Campanian). Equivalent planktonic foraminifera zones recognized are: Dicarinella concavata (Coniacian), the lower most part of Dicarinella asymetrica (earliest Santonian) and Globotruncanita elevata (early Campanian). The integrated zonation presented here is considered to provide higher resolution than the use of either group alone. The absence of calcareous nannofossil biozones CC13 and CC17 in most of the studied sections, associated with regional vertical lithofacies changes, indicates that recognition of the Turonian/Coniacian and Santonian/Campanian stage boundary intervals in the region have been hampered by depositional hiatuses at major sequence boundaries resulting in incomplete sections. These disconformities are attributed to eustatic sea-level fluctuations and regional tectonics resulting from flexuring of the Syrian Arc fold belt. The Coniacian to Santonian succession can be divided into three third-order depositional sequences, which are bounded by four widely recognized sequence boundaries.
Ireneusz Walaszczyk - One of the best experts on this subject based on the ideXlab platform.
-
Allostratigraphy and biostratigraphy of the Upper Cretaceous (Coniacian-Santonian) Western Canada Foreland Basin. (Bulletin of the American Museum of Natural History, no. 414)
2017Co-Authors: Neil H. Landman, Darren R Grocke, Ireneusz Walaszczyk, Meriem D. Grifi, A. Guy Plint, Beth Hooper, João Trabucho Alexandre, Ian JarvisAbstract:172 pages, 15 folded leaves of plates : illustrations (some color), maps (some color) ; 26 cm. chapter 1. Integrated, high-resolution allostratigraphic, biostratigraphic and carbon-isotope correlation of Coniacian strata (Upper Cretaceous), western Alberta and northern Montana / A. Guy Plint, Elizabeth A. Hooper, Meriem D. Grifi, Ireneusz Walaszczyk, Neil H. Landman, Darren R. Grocke, Joao P. Trabucho Alexandre, and Ian Jarvis -- chapter 2. Inoceramid bivalves from the Coniacian and basal Santonian (Upper Cretaceous) of the Western Canada Foreland Basin / Ireneusz Walaszczyk, A. Guy Plint, and Neil H. Landman -- chapter 3. Scaphitid ammonites from the Upper Cretaceous (Coniacian-Santonian) Western Canada Foreland Basin / Neil H. Landman, A. Guy Plint, and Ireneusz Walaszczyk.
-
inoceramid fauna and biostratigraphy of the upper middle coniacian lower middle Santonian of the pueblo section se colorado us western interior
Cretaceous Research, 2007Co-Authors: Ireneusz Walaszczyk, William A. CobbanAbstract:The Middle Coniacian to Middle Santonian inoceramid succession of the Pueblo section, southeastern Colorado, US Western Interior, is reviewed in the context of the zonal scheme applied in Europe. The Middle Coniacian record starts with the upper Middle Coniacian Volviceramus involutus Zone, because the base of the succession is characterised by a hitherto unsuspected stratigraphical gap, spanning the topmost Lower and lower Middle Coniacian in European inoceramid terms. The base of the Upper Coniacian is recognised by the entry of Magadiceramus; this substage is divided into a Magadiceramus subquadratus Interval Zone and a Magadiceramus crenelatus Taxon Range Zone. The base of the Santonian is taken at the base of the Cladoceramus undulatoplicatus Taxon Range Zone. The Middle Santonian is assigned to the Cordiceramus bueltenensis Zone, and the base of the Upper Santonian is placed at the base of the zone of Cordiceramus muelleri. The inoceramid faunas of the Pueblo succession are similar to those known from southern Europe, south of the regular occurrence of sphenoceramids. The apparent differences reported in the previous literature between the inoceramid faunas of Europe and of the Western Interior at this level resulted mainly from differences in the taxonomic concepts applied. The new data enable correlation between the proposed inoceramid zonal scheme and the scaphitid ammonite zones.
-
Inoceramid fauna and biostratigraphy of the upper Middle Coniacian–lower Middle Santonian of the Pueblo Section (SE Colorado, US Western Interior)
Cretaceous Research, 2007Co-Authors: Ireneusz Walaszczyk, William A. CobbanAbstract:The Middle Coniacian to Middle Santonian inoceramid succession of the Pueblo section, southeastern Colorado, US Western Interior, is reviewed in the context of the zonal scheme applied in Europe. The Middle Coniacian record starts with the upper Middle Coniacian Volviceramus involutus Zone, because the base of the succession is characterised by a hitherto unsuspected stratigraphical gap, spanning the topmost Lower and lower Middle Coniacian in European inoceramid terms. The base of the Upper Coniacian is recognised by the entry of Magadiceramus; this substage is divided into a Magadiceramus subquadratus Interval Zone and a Magadiceramus crenelatus Taxon Range Zone. The base of the Santonian is taken at the base of the Cladoceramus undulatoplicatus Taxon Range Zone. The Middle Santonian is assigned to the Cordiceramus bueltenensis Zone, and the base of the Upper Santonian is placed at the base of the zone of Cordiceramus muelleri. The inoceramid faunas of the Pueblo succession are similar to those known from southern Europe, south of the regular occurrence of sphenoceramids. The apparent differences reported in the previous literature between the inoceramid faunas of Europe and of the Western Interior at this level resulted mainly from differences in the taxonomic concepts applied. The new data enable correlation between the proposed inoceramid zonal scheme and the scaphitid ammonite zones.
-
Santonian - Campanian (Upper Cretaceous) inoceramids from the Houthalen mineshaft, NE Belgium
2005Co-Authors: Ireneusz Walaszczyk, Annie V. DhondtAbstract:The Santonian and Campanian inoceramids from the Houthalen mineshaft (Limburg, NE Belgium) are described. Four successive faunas were distinguished: the Sphenoceramus pachti fauna, dated for the Middle Santonian, the Sphenoceramus patootensiformis fauna, of the upper Upper Santonian - lower Lower Campanian, the Cordiceramus paraheberti fauna, possibly of the upper Lower Campanian, and the Inoceramus tenuilineatus fauna, characteristic for the middle Upper Campanian. The appearance of the latter fauna marks one of the main turnover events in the evolution of the Campanian inoceramids.
-
turonian through Santonian deposits of the central polish uplands their facies development inoceramid paleontology and stratigraphy
Acta Geologica Polonica, 1992Co-Authors: Ireneusz WalaszczykAbstract:Stratigraphy, inoceramid paleontology and facies characteristics of the Turonian through Santonian deposits of the Central Polish Uplands are presented, on the basis of which 17 inoceramid zones are recognized and their position against the ammonite standard division is discussed. Apart from the Middle/Upper Santonian and Santonian/Campanian boundary all other stage and substage boundaries are well recognizable with the inoceramid fauna. Most of the inoceramids, comprising about 40 species, assigned to six genera, are monographed. Two species from the Turonian-Coniacian boundary interval are described as new: Mytiloides turonicus sp. n. and Inoceramus vistulensis sp. n. The Mytiloides labiatus group is thoroughly treated and particular members are discussed, to show that M. suhmytiloides (SEITZ) and M. subhercynicus (SEITZ), the widely cited species of this group, are invalid and thus should be rejected. The names Mytiloides opalensis sensu SEITZ (non BSE) and M. duplicostatus sensu KAUFFMAN (non ANDERSON) are younger synonyms of M. kossmati (HElNZ). A revision of the whole genus Cremnoceramus is also presented. The stratigraphic scheme applied to the Turonian through Santonian deposits of the Central Polish Uplands allows to solve some regional problems, and to construct a unified chronostratigraphic facies scheme for the southern part of the epicontinental areas in Poland. The facies characteristics combined with the paleotectonic setting of the studied area is the base of the distinguishing of the four geotectonic-facies regions: the Circum-Sudetic Trap Basins, the Cracow Swell, the Danish Polish Trough, and the Russian Chalk Sea. The evolution of the studied areas during Turonian through Santonian time is assembled to indicate the primary role of tectonic movements of the Subhercynian phase of the Alpine orogeny.
Fayez Ahmad - One of the best experts on this subject based on the ideXlab platform.
-
Tethyan plankton bioevents calibrated to stable isotopes across the upper Santonian–lower Campanian transition in north-western Tunisia
Cretaceous Research, 2018Co-Authors: Sherif Farouk, Mahmoud Faris, Zaineb Elamri, Fayez Ahmad, Michael WagreichAbstract:Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13 to CC21/UC15c) equivalent to three planktonic foraminiferal zones named Dicarinella asymetrica, Globotruncanita elevata , Globotruncana ventricosa . The Santonian/Campanian Boundary Event (SCBE) is characterized by a positive δ 13 C double peaks. The first peak (a) occurs within the uppermost CC17 Zone and Dicarinella asymetrica Zone. The second peak (b) directly occurs below the base of CC18 (FO of Bronsonia parca parca ) and last occurrence (LO) of Dicarinella asymetrica . It is marked by several extinction bioevents of representatives of Whiteinella , Dicarinella and Sigalia and the gradual disappearance of species of Marginotruncana (all species except M. sinuosa and M. marginata ). At the beginning of the Campanian a diversification of Globotruncanidae was noted.
-
tethyan plankton bioevents calibrated to stable isotopes across the upper Santonian lower campanian transition in north western tunisia
Cretaceous Research, 2017Co-Authors: Sherif Farouk, Mahmoud Faris, Zaineb Elamri, Fayez Ahmad, Michael WagreichAbstract:Abstract Calcareous nannofossil and planktonic foraminifera biostratigraphic datums are correlated with carbon isotope stratigraphy across the upper Santonian–lower Campanian transition from Ain Zouakra outcrop (Elles area) in north-western Tunisia. Twenty two calcareous microplankton bio-events are identified and discussed, including 11 planktonic foraminiferal and 11 nannofossil events. The studied upper Santonian–lower Campanian succession can be divided into five nannofossil zones (CC17/UC13 to CC21/UC15c) equivalent to three planktonic foraminiferal zones named Dicarinella asymetrica, Globotruncanita elevata , Globotruncana ventricosa . The Santonian/Campanian Boundary Event (SCBE) is characterized by a positive δ 13 C double peaks. The first peak (a) occurs within the uppermost CC17 Zone and Dicarinella asymetrica Zone. The second peak (b) directly occurs below the base of CC18 (FO of Bronsonia parca parca ) and last occurrence (LO) of Dicarinella asymetrica . It is marked by several extinction bioevents of representatives of Whiteinella , Dicarinella and Sigalia and the gradual disappearance of species of Marginotruncana (all species except M. sinuosa and M. marginata ). At the beginning of the Campanian a diversification of Globotruncanidae was noted.
-
Integrated microfossil biostratigraphy, facies distribution, and depositional sequences of the upper Turonian to Campanian succession in northeast Egypt and Jordan
Facies, 2016Co-Authors: Sherif Farouk, Fayez Ahmad, John H. Powell, Akmal M. MarzoukAbstract:Six upper Turonian to Campanian sections in Egypt (Sinai) and Jordan were studied for their microfossil biostratigraphy (calcareous nannofossils and planktonic foraminifera), facies distribution and sequence stratigraphic frameworks. Carbonate (mostly chalk) and chert lithofacies dominate the basinward northern sections passing laterally and vertically to mixed carbonate/siliciclastic lithofacies towards the shoreline in the southeast. Twenty-six lithofacies types have been identified and grouped into six lithofacies associations: littoral siliciclastic facies belt; peritidal carbonate; intertidal carbonate platform/ramp; high-energy ooidal shoals and shelly biostromes; shallow subtidal; and pelagic facies association. The following calcareous nannofossil biozones were recognized: Luianorhabdus malefomis (CC12) (late Turonian), Micula staurophora (CC14) (early Coniacian), Reinhardtites anthophorus (CC15) (late Coniacian), Lucianorhabdus cayeuxii (CC16) (early Santonian) and Broinsonia parca parca (CC18) (Campanian). Equivalent planktonic foraminifera zones recognized are: Dicarinella concavata (Coniacian), the lower most part of Dicarinella asymetrica (earliest Santonian) and Globotruncanita elevata (early Campanian). The integrated zonation presented here is considered to provide higher resolution than the use of either group alone. The absence of calcareous nannofossil biozones CC13 and CC17 in most of the studied sections, associated with regional vertical lithofacies changes, indicates that recognition of the Turonian/Coniacian and Santonian/Campanian stage boundary intervals in the region have been hampered by depositional hiatuses at major sequence boundaries resulting in incomplete sections. These disconformities are attributed to eustatic sea-level fluctuations and regional tectonics resulting from flexuring of the Syrian Arc fold belt. The Coniacian to Santonian succession can be divided into three third-order depositional sequences, which are bounded by four widely recognized sequence boundaries.
