The Experts below are selected from a list of 3366 Experts worldwide ranked by ideXlab platform
Ireneusz Walaszczyk - One of the best experts on this subject based on the ideXlab platform.
-
Turonian–Coniacian (Upper Cretaceous) of the Babadag Basin (North Dobrogea, Romania): integrated biostratigraphy and microfacies succession
Geological Quarterly, 2019Co-Authors: Damian Gerard Lodowski, Ireneusz Walaszczyk, Eugen GrădinaruAbstract:The Upper Turonian to Middle Coniacian (Upper Cretaceous) succession of the Babadag Basin (North Dobrogea, Romania) constitutes an apparently continuous fossiliferous carbonate succession. The presence of moderately rich inoceramid, ammonite and foraminiferal assemblages allows for the application of a precise biostratigraphic subdivision. The palaeoenvironmental conditions and evolution of the Babadag Basin during the Late Turonian–Middle Coniacian are inferred using microfacies analysis and foraminiferal spectra. Together, these suggest the Turonian–Coniacian Badabag Basin reflects relatively shallow-water conditions in a near-shore environment, punctuated by two regression events in the Late Turonian and in the Middle Coniacian.
-
inoceramids and associated ammonite faunas from the uppermost turonian lower Coniacian upper cretaceous of the anaipadi saradamangalam region of the cauvery basin south east india
Acta Geologica Polonica, 2018Co-Authors: Ireneusz Walaszczyk, W J Kennedy, Amruta R. ParanjapeAbstract:The lower (but not lowermost) part of the Upper Cretaceous Anaipadi Formation of the Trichinopoly Group in the area between Kulatur, Saradamangalam and Anaipadi, in the south-western part of the Cauvery Basin in southeast India yielded rich inoceramid and ammonite faunas. The ammonites: Mesopuzosia gaudama (Forbes, 1846), Damesites sugata (Forbes, 1846), Onitschoceras sp., Kossmaticeras ( Kossmaticeras ) theobaldianum (Stoliczka, 1865), Lewesiceras jimboi (Kossmat, 1898), Placenticeras kaffrarium Etheridge, 1904, and Pseudoxybeloceras ( Schlueterella ) sp., are characteristic of the Kossmaticeras theobaldianum Zone. The absence of Peroniceras ( P .) dravidicum (Kossmat, 1895) indicates the presence of only lower part of this zone, referred to the nominative Kossmaticeras theobaldianum Subzone at the localities studied. The inoceramids present are Tethyoceramus madagascariensis (Heinz, 1933) and Cremnoceramus deformis erectus (Meek, 1877), recorded for the first time from the region. The latter dates the studied interval as early early Coniacian, and allows, for the first time, direct chronostratigraphic dating of the Tethyoceramus madagascariensis Zone, and consequently also of the Kossmaticeras theobaldianum Subzone. As inoceramids occur in the middle part of the ammonite-rich interval, the Kossmaticeras theobaldianum Subzone may be as old as latest Turonian and not younger than early early Coniacian. The base of the Coniacian lies in the lower, but not lowermost part of the Anaipadi Formation. Both inoceramids and ammonites represent taxa known from Madagascar and South Africa.
-
Inoceramids and associated ammonite faunas from the uppermost Turonian−lower Coniacian (Upper Cretaceous) of the Anaipadi–Saradamangalam region of the Cauvery Basin, south-east India
Acta Geologica Polonica, 2018Co-Authors: Ireneusz Walaszczyk, William James Kennedy, Amruta R. ParanjapeAbstract:The lower (but not lowermost) part of the Upper Cretaceous Anaipadi Formation of the Trichinopoly Group in the area between Kulatur, Saradamangalam and Anaipadi, in the south-western part of the Cauvery Basin in southeast India yielded rich inoceramid and ammonite faunas. The ammonites: Mesopuzosia gaudama (Forbes, 1846), Damesites sugata (Forbes, 1846), Onitschoceras sp., Kossmaticeras ( Kossmaticeras ) theobaldianum (Stoliczka, 1865), Lewesiceras jimboi (Kossmat, 1898), Placenticeras kaffrarium Etheridge, 1904, and Pseudoxybeloceras ( Schlueterella ) sp., are characteristic of the Kossmaticeras theobaldianum Zone. The absence of Peroniceras ( P .) dravidicum (Kossmat, 1895) indicates the presence of only lower part of this zone, referred to the nominative Kossmaticeras theobaldianum Subzone at the localities studied. The inoceramids present are Tethyoceramus madagascariensis (Heinz, 1933) and Cremnoceramus deformis erectus (Meek, 1877), recorded for the first time from the region. The latter dates the studied interval as early early Coniacian, and allows, for the first time, direct chronostratigraphic dating of the Tethyoceramus madagascariensis Zone, and consequently also of the Kossmaticeras theobaldianum Subzone. As inoceramids occur in the middle part of the ammonite-rich interval, the Kossmaticeras theobaldianum Subzone may be as old as latest Turonian and not younger than early early Coniacian. The base of the Coniacian lies in the lower, but not lowermost part of the Anaipadi Formation. Both inoceramids and ammonites represent taxa known from Madagascar and South Africa.
-
inoceramid bivalves from the Coniacian upper cretaceous of the staffhorst shaft lower saxony germany stratigraphical significance of a unique succession
Cretaceous Research, 2017Co-Authors: Ireneusz Walaszczyk, Christopher J WoodAbstract:Abstract The Staffhorst shaft (Lower Saxony, Germany) ranks amongst the critical sections for documentation of the inoceramid record of the Euramerican Coniacian Stage (Upper Cretaceous). In spite of a number of disadvantages (i.e., interval sampling and stratigraphical gaps), this section does provide details of the inoceramid distribution across insufficiently known substage boundary intervals of the Coniacian. The lower–middle Coniacian boundary is marked by the Inoceramus gibbosus Zone, at the top of the lower Coniacian, followed by the Volviceramus koeneni Zone of the lower middle Coniacian. The zone of I. gibbosus Schluter, 1877 succeeds the Cremnoceramus-dominated lower Coniacian and usually is missing in the Euramerican biogeographic region. In addition to the index species, the V. koeneni Zone is characterised by Volviceramus exogyroides (Meek and Hayden, 1862), a North American taxon that was poorly documented in Europe hitherto. The base of the upper Coniacian is best documented by the common appearance of Sphenoceramus subcardissoides (Schluter, 1877) and of Magadiceramus subquadratus (Schluter, 1887). Inoceramus fasciculatus Heine, 1929, and the stratigraphically earliest ‘sphenoceramids’, are good proxies for this boundary. The record from the Staffhorst shaft confirms and supplements recent reports on the inoceramid succession of the Coniacian across the entire Euramerican biogeographic region.
-
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.
Ian Jarvis - One of the best experts on this subject based on the ideXlab platform.
-
palynology and calcareous nannofossil biostratigraphy of the turonian Coniacian boundary the proposed boundary stratotype at salzgitter salder germany and its correlation in nw europe
Cretaceous Research, 2021Co-Authors: Ian Jarvis, Martin A Pearce, Tobias Puttmann, Silke Voigt, Irek WalaszczykAbstract:Abstract New palynological and calcareous nannofossil records are presented for the Turonian–Coniacian boundary section at Salzgitter-Salder, Germany, the candidate Coniacian GSSP. The proposed base of the Coniacian Stage is the base of Bed 46, the first appearance datum level of Cremnoceramus deformis erectus, which is coincident with a δ13C minimum at the top of the Navigation carbon isotope event. Palynological assemblages are dominated by organic walled dinoflagellate cysts (dinocysts). Stratigraphic ranges, abundances, species richness, diversity, and assemblage composition data are reported for 137 dinocyst and 119 nannofossil taxa. Dinocyst assemblages are dominated by the peridinioid cyst Palaeohystrichophora infusorioides and the gonyaulacoid cysts of Spiniferites spp. Dinocyst records, events and zonations are assessed. An uppermost Turonian P. infusorioides abundance minimum occurs within the Navigation event, and a marked influx and acme of the taxon with other peridinioid cysts occurs in the lower Coniacian (the P. infusorioides Event). The highest occurrence of Cyclonephelium membraniphorum is recorded at the base of the Coniacian. Correlation of the P. infusorioides Event between Germany, Czech Republic and England is demonstrated. This event represents a productivity pulse, attributed to water-mass reorganisation accompanying early Coniacian eustatic sea-level rise. The nannofossils Biscutum constans, Kamptnerius magnificus and Zeugrhabdotus noeliae, potential cool water indicators, display maximum relative abundances immediately below and above the stage boundary. An increased abundance of Marthasterites furcatus characterises the lowest Coniacian, and a coeval but more extended acme of the species occurs elsewhere. Helicolithus turonicus has its highest occurrence in the lower Coniacian Cremnoceramus walterdorfensis hannovrensis Zone.
-
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.
-
organic walled dinoflagellate cyst records from a prospective turonian Coniacian upper cretaceous gssp slupia nadbrzezna poland
Cretaceous Research, 2016Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, Ireneusz Walaszczyk, Bruce A TocherAbstract:Abstract A river section at Slupia Nadbrzezna, central Poland, has been proposed as a candidate Turonian – Coniacian (Cretaceous) GSSP, in combination with the Salzgitter-Salder quarry section of Lower Saxony, Germany. Results of a high-resolution (25 cm) palynological study of the boundary interval in the Slupia Nadbrzezna section are presented. Terrestrial palynomorphs are rare; marine organic-walled dinoflagellate cysts dominate the palynological assemblage. The dinoflagellate cyst assemblage has a low species richness (5–11 per sample; total of 18 species recorded) and diversity (Shannon index H = 0.8–1.4), dominated by four taxa: Circulodinium distinctum subsp. distinctum; Oligosphaeridium complex; Spiniferites ramosus subsp. ramosus; Surculosphaeridium longifurcatum. Declining proportions of O. complex and S. ramosus subsp. ramosus characterise the uppermost Turonian, with an increased dominance of S. longifurcatum in the lower Coniacian. The Turonian – Coniacian boundary interval includes an acme of C. distinctum subsp. distinctum in the upper Mytiloides scupini Zone, a dinoflagellate cyst abundance maximum in the Cremnoceramus walterdorfensis walterdorfensis Zone, and the highest occurrence of Senoniasphaera turonica in the basal Coniacian lower Cremnoceramus deformis erectus Zone. Most previously reported Turonian – Coniacian boundary dinoflagellate cyst marker species are absent; a shallow-water oligotrophic epicontinental depositional setting, remote from terrestrial influence, likely limited species diversity and excluded many taxa of biostratigraphic value.
-
Organic-walled dinoflagellate cyst records from a prospective Turonian – Coniacian (Upper Cretaceous) GSSP, Słupia Nadbrzeżna, Poland
Cretaceous Research, 2016Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, Ireneusz Walaszczyk, Bruce A TocherAbstract:Abstract A river section at Slupia Nadbrzezna, central Poland, has been proposed as a candidate Turonian – Coniacian (Cretaceous) GSSP, in combination with the Salzgitter-Salder quarry section of Lower Saxony, Germany. Results of a high-resolution (25 cm) palynological study of the boundary interval in the Slupia Nadbrzezna section are presented. Terrestrial palynomorphs are rare; marine organic-walled dinoflagellate cysts dominate the palynological assemblage. The dinoflagellate cyst assemblage has a low species richness (5–11 per sample; total of 18 species recorded) and diversity (Shannon index H = 0.8–1.4), dominated by four taxa: Circulodinium distinctum subsp. distinctum; Oligosphaeridium complex; Spiniferites ramosus subsp. ramosus; Surculosphaeridium longifurcatum. Declining proportions of O. complex and S. ramosus subsp. ramosus characterise the uppermost Turonian, with an increased dominance of S. longifurcatum in the lower Coniacian. The Turonian – Coniacian boundary interval includes an acme of C. distinctum subsp. distinctum in the upper Mytiloides scupini Zone, a dinoflagellate cyst abundance maximum in the Cremnoceramus walterdorfensis walterdorfensis Zone, and the highest occurrence of Senoniasphaera turonica in the basal Coniacian lower Cremnoceramus deformis erectus Zone. Most previously reported Turonian – Coniacian boundary dinoflagellate cyst marker species are absent; a shallow-water oligotrophic epicontinental depositional setting, remote from terrestrial influence, likely limited species diversity and excluded many taxa of biostratigraphic value.
-
a revised northern european turonian upper cretaceous dinoflagellate cyst biostratigraphy integrating palynology and carbon isotope events
Review of Palaeobotany and Palynology, 2015Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, David Ulicný, Bruce A Tocher, Joao Trabuchoalexandre, Darren R GrockeAbstract:Organic walled dinoflagellate cyst (dinocyst) assemblage data are presented for a new Turonian regional reference core (Bch-1) drilled at Běchary in the Bohemian Cretaceous Basin, east-central Czech Republic. The detailed stratigraphic framework for the section is summarised based on calcareous nannofossil and macrofossil biostratigraphy, regional e-log correlation, sequence stratigraphy and carbon isotope chemostratigraphy. Dinocyst results obtained for 196 samples from the 405 m long core offer the highest resolution (~ 22 kyr) stratigraphically well-constrained data set available to date for the Turonian Stage, 93.9–89.8 Ma. A dinocyst biostratigraphic framework is presented based on the evolutionary first and last occurrence, first common occurrence, and acmes of key species. Published dinocyst data from English Turonian Chalk successions in East Sussex, Berkshire, Kent and Norfolk are reviewed within a stratigraphic framework provided by macrofossil records and carbon isotope event (CIE) chemostratigraphy. Critical analysis of existing published Turonian dinocyst zonation schemes shows them to be untenable. Correlation of the English Chalk data to Bch-1 provides a basis for defining a regional dinocyst event stratigraphy with 22 datum levels, and a revised dinocyst zonation scheme constrained within a chemostratigraphic framework of 10 major CIEs. The new zones consist of a Cenomanian Litosphaeridium siphoniphorum Zone, followed by the Cauveridinium membraniphorum Zone spanning the uppermost Cenomanian to Lower Coniacian. This is subdivided into: Senoniasphaera turonica (Lower–mid-Middle Turonian); and Raetiaedinium truncigerum (mid-Middle Turonian–mid-Lower Coniacian) subzones. The Oligosphaeridium pulcherrimum Zone (Senonisphaera rotundata Subzone) characterises the Lower Coniacian. The new stratigraphy offers a basis for improved correlation and dating of Upper Cretaceous successions.
William A. Cobban - One of the best experts on this subject based on the ideXlab platform.
-
testing the congruence of the macrofossil versus microfossil record in the turonian Coniacian boundary succession of the wagon mound springer composite section ne new mexico usa
Acta Geologica Polonica, 2012Co-Authors: Ireneusz Walaszczyk, William A. Cobban, Jackie A Lees, Danuta Peryt, Christopher J WoodAbstract:The Turonian–Coniacian boundary succession from the Wagon Mound–Springer composite section in the US Western Interior shows a virtually identical macrofaunal record to that revealed in the proposed candidate Coniacian GSSP in the Salzgitter-Salder–Slupia Nadbrzezna composite section in central Europe, with easy identification in both regions of the base of the Coniacian Stage, as defined by the first appearance of the inoceramid bivalve species, Cremnoceramus deformis erectus (Meek). The macrofaunal boundary definition is additionally confirmed by foraminiferal and nannofossil data, demonstrating the high potential of the inoceramid marker for the base of the Coniacian. The former claims concerning distinct diachroneity between macrofossil and microfossil dates in the trans-Atlantic correlations, resulted from methodological deficiencies, and have no factual basis.
-
Testing the congruence of the macrofossil versus microfossil record in the Turonian–Coniacian boundary succession of the Wagon Mound–Springer composite section (NE New Mexico, USA)
Acta Geologica Polonica, 2012Co-Authors: Ireneusz Walaszczyk, William A. Cobban, Jackie A Lees, Danuta Peryt, Christopher J WoodAbstract:ABSTRACT Walaszczyk, I., Lees, J.A., Peryt, D., Cobban, W.A. and Wood, C.J. 2012. Testing the congruence of the microfossil versus microfossil record in the Turonian-Coniacian boundary succession of the Wagon Mound-Springer composite section (NE New Mexico, USA). Acta Geologica Polonica, 62 (4), 581-594. Warszawa. The Turonian-Coniacian boundary succession from the Wagon Mound-Springer composite section in the US Western Interior shows a virtually identical macrofaunal record to that revealed in the proposed candidate Coniacian GSSP in the Salzgitter-Salder-Słupia Nadbrzeżna composite section in central Europe, with easy identification in both regions of the base of the Coniacian Stage, as defined by the first appearance of the inoceramid bivalve species, Cremnoceramus deformis erectus (Meek). The macrofaunal boundary definition is additionally confirmed by the foraminiferal and nannofossil data, demonstrating the high potential of the inoceramid marker for the base of the Coniacian. The former claims about distinct diachroneity between macrofossil and microfossil dates in the trans-Atlantic correlations, resulted from methodological deficiencies, and have no factual basis.
-
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.
-
palaeontology and biostratigraphy of the middle upper Coniacian and santonian inoceramids of the us western interior
Acta Geologica Polonica, 2006Co-Authors: Ireneusz Walaszczyk, William A. CobbanAbstract:The taxonomy of the Middle-Late Coniacian and Santonian inoceramids of the US Western Interior, including some specimens from the Canadian Western Interior, is revised, based mainly on the extensive collections of the US Geological Survey. The classic Meek and Hayden material is discussed. Forty-four species are described of which 5 are new: Inoceramus americanus , Inoceramus sokolovi , Inoceramus robertsoni , Inoceramus glacierensis , and Sphenoceramus gilli . The Middle Coniacian to Santonian inoceramids of the Western Interior represent a uniform Euramerican fauna. This allows the application of a uniform biostratigraphical zonation throughout the whole biogeographical region. Starting in the Late Coniacian, inoceramid faunas are characterised by relatively strong north–south biogeographic differentiation. The inoceramid zonation applied is discussed, diagnosed, and compared to previously used schemes, and to the ammonite zonation commonly used in the US Western Interior.
-
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.
Bruce A Tocher - One of the best experts on this subject based on the ideXlab platform.
-
organic walled dinoflagellate cyst records from a prospective turonian Coniacian upper cretaceous gssp slupia nadbrzezna poland
Cretaceous Research, 2016Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, Ireneusz Walaszczyk, Bruce A TocherAbstract:Abstract A river section at Slupia Nadbrzezna, central Poland, has been proposed as a candidate Turonian – Coniacian (Cretaceous) GSSP, in combination with the Salzgitter-Salder quarry section of Lower Saxony, Germany. Results of a high-resolution (25 cm) palynological study of the boundary interval in the Slupia Nadbrzezna section are presented. Terrestrial palynomorphs are rare; marine organic-walled dinoflagellate cysts dominate the palynological assemblage. The dinoflagellate cyst assemblage has a low species richness (5–11 per sample; total of 18 species recorded) and diversity (Shannon index H = 0.8–1.4), dominated by four taxa: Circulodinium distinctum subsp. distinctum; Oligosphaeridium complex; Spiniferites ramosus subsp. ramosus; Surculosphaeridium longifurcatum. Declining proportions of O. complex and S. ramosus subsp. ramosus characterise the uppermost Turonian, with an increased dominance of S. longifurcatum in the lower Coniacian. The Turonian – Coniacian boundary interval includes an acme of C. distinctum subsp. distinctum in the upper Mytiloides scupini Zone, a dinoflagellate cyst abundance maximum in the Cremnoceramus walterdorfensis walterdorfensis Zone, and the highest occurrence of Senoniasphaera turonica in the basal Coniacian lower Cremnoceramus deformis erectus Zone. Most previously reported Turonian – Coniacian boundary dinoflagellate cyst marker species are absent; a shallow-water oligotrophic epicontinental depositional setting, remote from terrestrial influence, likely limited species diversity and excluded many taxa of biostratigraphic value.
-
Organic-walled dinoflagellate cyst records from a prospective Turonian – Coniacian (Upper Cretaceous) GSSP, Słupia Nadbrzeżna, Poland
Cretaceous Research, 2016Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, Ireneusz Walaszczyk, Bruce A TocherAbstract:Abstract A river section at Slupia Nadbrzezna, central Poland, has been proposed as a candidate Turonian – Coniacian (Cretaceous) GSSP, in combination with the Salzgitter-Salder quarry section of Lower Saxony, Germany. Results of a high-resolution (25 cm) palynological study of the boundary interval in the Slupia Nadbrzezna section are presented. Terrestrial palynomorphs are rare; marine organic-walled dinoflagellate cysts dominate the palynological assemblage. The dinoflagellate cyst assemblage has a low species richness (5–11 per sample; total of 18 species recorded) and diversity (Shannon index H = 0.8–1.4), dominated by four taxa: Circulodinium distinctum subsp. distinctum; Oligosphaeridium complex; Spiniferites ramosus subsp. ramosus; Surculosphaeridium longifurcatum. Declining proportions of O. complex and S. ramosus subsp. ramosus characterise the uppermost Turonian, with an increased dominance of S. longifurcatum in the lower Coniacian. The Turonian – Coniacian boundary interval includes an acme of C. distinctum subsp. distinctum in the upper Mytiloides scupini Zone, a dinoflagellate cyst abundance maximum in the Cremnoceramus walterdorfensis walterdorfensis Zone, and the highest occurrence of Senoniasphaera turonica in the basal Coniacian lower Cremnoceramus deformis erectus Zone. Most previously reported Turonian – Coniacian boundary dinoflagellate cyst marker species are absent; a shallow-water oligotrophic epicontinental depositional setting, remote from terrestrial influence, likely limited species diversity and excluded many taxa of biostratigraphic value.
-
a revised northern european turonian upper cretaceous dinoflagellate cyst biostratigraphy integrating palynology and carbon isotope events
Review of Palaeobotany and Palynology, 2015Co-Authors: Kate Olde, Martin A Pearce, Ian Jarvis, David Ulicný, Bruce A Tocher, Joao Trabuchoalexandre, Darren R GrockeAbstract:Organic walled dinoflagellate cyst (dinocyst) assemblage data are presented for a new Turonian regional reference core (Bch-1) drilled at Běchary in the Bohemian Cretaceous Basin, east-central Czech Republic. The detailed stratigraphic framework for the section is summarised based on calcareous nannofossil and macrofossil biostratigraphy, regional e-log correlation, sequence stratigraphy and carbon isotope chemostratigraphy. Dinocyst results obtained for 196 samples from the 405 m long core offer the highest resolution (~ 22 kyr) stratigraphically well-constrained data set available to date for the Turonian Stage, 93.9–89.8 Ma. A dinocyst biostratigraphic framework is presented based on the evolutionary first and last occurrence, first common occurrence, and acmes of key species. Published dinocyst data from English Turonian Chalk successions in East Sussex, Berkshire, Kent and Norfolk are reviewed within a stratigraphic framework provided by macrofossil records and carbon isotope event (CIE) chemostratigraphy. Critical analysis of existing published Turonian dinocyst zonation schemes shows them to be untenable. Correlation of the English Chalk data to Bch-1 provides a basis for defining a regional dinocyst event stratigraphy with 22 datum levels, and a revised dinocyst zonation scheme constrained within a chemostratigraphic framework of 10 major CIEs. The new zones consist of a Cenomanian Litosphaeridium siphoniphorum Zone, followed by the Cauveridinium membraniphorum Zone spanning the uppermost Cenomanian to Lower Coniacian. This is subdivided into: Senoniasphaera turonica (Lower–mid-Middle Turonian); and Raetiaedinium truncigerum (mid-Middle Turonian–mid-Lower Coniacian) subzones. The Oligosphaeridium pulcherrimum Zone (Senonisphaera rotundata Subzone) characterises the Lower Coniacian. The new stratigraphy offers a basis for improved correlation and dating of Upper Cretaceous successions.
Neil H. Landman - 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.
-
Chapter 2: Inoceramid Bivalves from the Coniacian and Basal Santonian (Upper Cretaceous) of the Western Canada Foreland Basin
Bulletin of the American Museum of Natural History, 2017Co-Authors: Ireneusz Walaszczyk, A. Guy Plint, Neil H. LandmanAbstract:ABSTRACT Inoceramid bivalves are the dominant invertebrate fauna of the Coniacian and basal Santonian of the Western Canada Foreland Basin in western Alberta. In the upper lower Coniacian through to basal Santonian, six successive faunas are recognized, which provide the basis for corresponding, formally defined inoceramid zones. From bottom upward these are the zones of: Cremnoceramus crassus crassus /C. deformis deformis, Inoceramus gibbosus, Volviceramus koeneni, Volviceramus involutus, Sphenoceramus subcardissoides, and Sphenoceramus ex gr. pachti. Particular faunas represent assemblages known widely from the Euramerican biogeographic region, although they characterize mostly its northern, boreal area. The inoceramid-based biostratigraphic scheme allows correlation with other parts of the North American Western Interior and with parts of the Euramerican biogeographic region. The studied succession provides a good record of the Inoceramus gibbosus Zone, which characterizes the topmost lower Coniacian. ...
-
chapter 3 scaphitid ammonites from the upper cretaceous Coniacian santonian western canada foreland basin
Bulletin of the American Museum of Natural History, 2017Co-Authors: Neil H. Landman, Guy A Plint, Ireneusz WalaszczykAbstract:ABSTRACT The Upper Cretaceous (Coniacian-Santonian) of the Western Canada Foreland Basin, contains a rich record of scaphitid ammonites (scaphites). We describe four species: Scaphites (Scaphites) preventricosus Cobban, 1952, Scaphites (S.) ventricosus Meek and Hayden, 1862, Scaphites (S.) depressus Reeside, 1927, and Clioscaphites saxitonianus (McLearn, 1929). These are widespread index fossils that demarcate the upper lower-middle, middle, and upper Coniacian, and the lower Santonian, respectively. They occur in the lower part of the Wapiabi Formation, Alberta. The Coniacian part of the section has been divided into 24 informal allomembers based on the recognition of marine flooding surfaces, most of which can be traced through the >750 km extent of the study area. The most distinctive feature in the ontogenetic development of scaphites is the change in coiling during ontogeny. At the approach of maturity, the shell uncoils slightly, forming a shaft, which then recurves backward approaching the earlier ...
