The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Daniela Reháková - One of the best experts on this subject based on the ideXlab platform.
-
Integrated stratigraphy and palaeoenvironment of the Berriasian peri-reefal limestones at Štramberk (Outer Western Carpathians, Czech Republic)
Palaeogeography Palaeoclimatology Palaeoecology, 2019Co-Authors: Lucie Vaňková, Daniela Reháková, Lilian Švábenická, Petr Skupien, Tiiu Elbra, Petr Schnabl, Petr Pruner, Martin Košťák, Zdeněk Vašíček, Andrea SvobodováAbstract:Abstract A high-resolution multidisciplinary study of two profiles in the Kotouc Quarry at Stramberk was carried out to define the age and palaeoenvironmental setting of the peri-reefal Stramberk Limestone. Calpionellids of the Alpina and Ferasini subzones of the standard Calpionella Zone confirm an early Berriasian age for both studied sequences. The presence of the calcareous nannofossils Nannoconus kamptneri minor and ?Speetonia colligata supports this stratigraphic interpretation. An ammonite assemblage with Pseudosubplanites grandis was found corresponding to the upper part of the lower Berriasian (Grandis Subzone). Foraminiferan assemblages contain several taxa previously reported from the Valanginian. Magnetostratigraphy verifies that the studied sections span the magnetozones M18r to M18n. Rock magnetic measurements indicate magnetite as the carrier of characteristic remanent magnetization. A palaeolatitude suggested location at 36°N. Microfacies indicate palaeoenvironments of slope (FZ 4), platform margin reefs, sand shoals (FZ 5, FZ 6) and possibly patch-reefs in the inner platform (FZ 7). The presence of Calpionellids and the polychaete Terebella lapilloides suggests deposition within the deeper parts of the outer ramp of a platform slope, with redeposited clasts derived from nearby reef slopes and/or talus. This research contributes to the Berriasian Working Group's efforts to define the Tithonian–Berriasian boundary.
-
Integrated stratigraphy and palaeoenvironmental interpretation of the Upper Kimmeridgian to Lower Berriasian pelagic sequences of the Velykyi Kamianets section (Pieniny Klippen Belt, Ukraine)
Palaeogeography Palaeoclimatology Palaeoecology, 2019Co-Authors: Jacek Grabowski, Daniela Reháková, Petr Schnabl, Petr Pruner, Vladimir Bakhmutov, Šimon Kdýr, Michał Krobicki, Kristalina Stoykova, Hubert WierzbowskiAbstract:Abstract A continuous sedimentary and stratigraphic record of Late Kimmeridgian – Early Berriasian age is presented from the pelagic succession from the eastern part of the Pieniny Klippen Belt (Velykyi Kamianets section, Ukraine). The studied section, 26-m-thick, was calibrated using biostratigraphy (Calpionellids, calcareous dinocysts, calcareous nannofossils), magnetostratigraphy, stable isotope stratigraphy (δ13C and δ18O) and gamma ray spectrometry. Magnetic polarity zones from M23r to M18n were identified. The magnetostratigraphic calibration of calcareous dinocysts zonation around the Kimmeridgian/Tithonian boundary has been performed for the first time. The Carpistomiosphaera borzai/Committosphaera pulla calcareous dinocyst zonal boundary is situated at the bottom of magnetozone M22n, slightly lower than first occurrence of calcareous nannofossil Conusphaera mexicana minor and higher than the standard Kimmeridgian/Tithonian boundary (M22Ar/M22An; Hybonoticeras beckeri/Hybonoticeras hybonotum Ammonite Zone boundary). The position of the Tithonian/Berriasian boundary in the magnetosubzone M19n2n (Crassicollaria/Calpionella Calpionellid zonal boundary) has been confirmed. A decrease of terrigenous input and an increase of carbonate productivity correlate with increasing sedimentation rates from 0.7 to 1.1 m/Myr in the Upper Kimmeridgian (M23r to M22r) to 5–7 m/Myr in the uppermost Tithonian and Lower Berriasian (M19n to M18n). Transition between the Saccocoma and calpionellid microfacies occurs in a narrow time interval, mostly within polarity subchron M20n1r. This event is traceable in similar stratigraphic position in several Western Tethyan sections and correlates perfectly with Nannofossil Calcification Event of the early Late Tithonian.
-
The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin)
Geologica Carpathica, 2019Co-Authors: Andrea Svobodová, Daniela Reháková, Lilian Švábenická, Marcela Svobodová, Petr Skupien, Tiiu Elbra, Petr SchnablAbstract:Abstract Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on Calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic/Cretaceous (J/K) boundary. The Kurovice section consists of allodapic and micrite limestones and marlstones. Identified standard microfacies types SMF 2, SMF 3 and SMF 4 indicate that sediments were deposited on a deep shelf margin (FZ 3), with a change, later, into distal basin conditions and sediments (FZ 1). The sequence spans a stratigraphic range from the Early Tithonian calcareous dinoflagellate Malmica Zone, nannoplankton zone NJT 15 and magnetozone M 21r to the late Early Berriasian calpionellid Elliptica Subzone of the Calpionella Zone, nannoplankton NK-1 Zone and M 17r magnetozone. The J/K boundary is marked by a quantitative increase of small forms of Calpionella alpina, the base of the Alpina Subzone (that corresponds to NJT 17b and M 19n.2n) and by the rare occurrence of Nannoconus wintereri. Palynomorphs include Early Berriasian terrestrial elements — non-calcareous dinoflagellate cysts Achomosphaera neptunii, Prolixosphaeridium sp. A and Tehamadinium evittii. The depositional area for Kurovice was situated at the margin of the NW Tethys. The influence of cold waters from northern latitudes and potential upwellings is highlighted by: 1) the high proportion of radiolarians and sponge spicules, 2) rare Calpionellids represented mostly by hyaline forms, 3) the absence of microgranular Calpionellids — chitinoidellids, 4) the small percentage of the genera Nannoconus, Polycostella and Conusphaera in nannofossil assemblages, as compared to other sites in Tethys, 5) scarce Nannoconus compressus, which has otherwise been mentioned from the Atlantic area.
-
Kimmeridgian - Tithonian of the pelagic Fatric succession in the Western Tatra (Central West Carpathians, Poland): Integrated bio-, magneto- and chemostratigraphy of the Dolina Lejowa section
2018Co-Authors: Jacek Grabowski, Daniela Reháková, Jolanta Iwanczuk, Renata Jach, Andrzej ChmielewskiAbstract:Kimmeridgian – Tithonian pelagic succession in the Fatric (Krizna) unit of Western Tatra Mts, ca. 47 m in thickness, comprise uppermost part of radiolarian limestones (Czajakowa Radiolarite Formation), red platy and nodular limestones of Ammonitico rosso type (Czorsztyn Limestone Formation) and grey marly limestones of the Jasenina Formation. Integrated dating of the Lejowa section (in progress) is based on calcareous dinocysts, Calpionellids and magnetic stratigraphy. The interval studied spreads from the Upper Kimmeridgian (Moluccana Zone) to Upper Tithonian (Crassicollaria Zone). According to preliminary magnetostratigraphic interpretation it corresponds to polarity zones from M24r to lower part of M19n. The Kimmeridgian/Tithonian boundary (Borzai/Pulla zonal boundary) falls in the lower part of the Czorsztyn Limestone Formation. The sedimentation of red nodular limestone terminates in the Malmica or Semiradiata Zone of Lower Tithonian. Bositra , radiolarian- Bositra and Bositra -radiolarian-spiculite microfacies dominate in the radiolarian limestones of Czajakowa Formation. Variegated microfacies with Saccoccoma ( Saccoccoma- radiolarian, Saccoccoma-Globochaete, radiolarian -Saccoccoma-Globochaete and Saccoccoma wackeston/packstone) appear as the most important component of microfacies in the Czorsztyn Formation. Saccocoma microfacies continue higher up into the lower part of Jasenina Formation. In the upper part of this formation the Calpionellids start to occur and they stepwise dominate over the the saccocomids. The Saccocoma microfacies finally disappear in the polarity chron M19r and combinations of calpionellid – Globochaete – radiolarian microfacies is the most common. The described succession of microfacies is typical for the Tethys ocean and was described from the Carpathian – Balkan area by numerous authors ( e.g. , Pszczolkowski , 1996; Lakova & Petrova , 2013; Rehakova et al ., 2011), minor differences are the result of paleogeography. The carbon isotopic ratio (δ 13 C) reveals a smooth decrease from ca. 2.5 ‰ in the Upper Kimmeridgian to ca. 1 ‰ in the Upper Tithonian. The major decrease between 2.5 ‰ and 1.5 ‰ occurs just in the Kimmeridgian/Tithonian boundary interval. Magnetic susceptibility (MS) in the grey coloured Jasenina Formation correlates very well with lithogenic elements and might be regarded as reliable proxy of terrigenous input. The correlation is not as evident in reddish Czajakowa and Czorsztyn formations due to more complex rock magnetic properties and mineralogical source of MS (co-occurrence of magnetite and hematite). The detailed chemostratigraphic survey has been performed with handheld Olympus XRF device. The data were verified by data obtained in geochemical laboratory. The amount of terrigenous elements is apparently lower in the Upper Kimmeridgian/Lower Tithonian than in the Upper Tithonian. Large increase of terrigenous input is observed in the polarity zone M20n (Chitinoidella Zone, Jasenina Fm), which might be compared with so called Hlboc event ( Rehakova , 2000; Grabowski et al. , 2013).
-
Calcareous nannofossil and ammonite integrated biostratigraphy across the Jurassic - Cretaceous boundary strata of the Kopanitsa composite section (West Srednogorie Unit, southwest Bulgaria)
Geologica Carpathica, 2018Co-Authors: Kristalina Stoykova, Vyara Idakieva, Marin Ivanov, Daniela RehákováAbstract:AbstractCalcareous nannofossil, calpionellid and ammonite occurrences have been directly constrained across the Jurassic–Cretaceous boundary interval in the section of Kopanitsa, SW Bulgaria. This section reveals a continuous and expanded sedimentary record through the Upper Tithonian and Lower Berriasian, besides an excellent calcareous nannofossil and ammonite record. The topmost part of the NJT 16b and the base of NJT 17a nannofossil Subzones correspond to the ammonite Microcanthum / Transitorius Subzone. The major part of the NJT 17a Subzone equates to the Durangites spp. ammonite Zone, whereas the NJT 17b Subzone correlates to the lower part of the B. jacobi ammonite Zone. The NKT nannofossil Zone approximately corresponds to the upper part of the B. jacobi Zone and the NK-1 nannofossil Zone correlates at least to the lowest part of the T. occitanica Zone. The FOs ofNannoconus globulus minor, N. wintereri, N. kamptneri minor, N. steinmannii minor, N. kamptneri kamptneriandN. steinmannii steinmanniiare confirmed as reliable bio-horizons for correlations in the Mediterranean Tethys area. The first occurrence ofNannoconus wintereriis regarded as an almost concomitant event with the first occurrence ofBerriasella jacobi. We suggest it could be the most useful nannofossil proxy for approximating the base of the B. jacobi Zone. Rare, but relatively well preserved Calpionellids and calcareous dinoflagellates together with microfacies analysis were used additionally for stratigraphical and palaeoenvironmental interpretations. The investigated sediments are typical for the steep slope of a steepened ramp, with accumulation of hemipelagic and gravitational deposits.
Petr Skupien - One of the best experts on this subject based on the ideXlab platform.
-
Integrated stratigraphy and palaeoenvironment of the Berriasian peri-reefal limestones at Štramberk (Outer Western Carpathians, Czech Republic)
Palaeogeography Palaeoclimatology Palaeoecology, 2019Co-Authors: Lucie Vaňková, Daniela Reháková, Lilian Švábenická, Petr Skupien, Tiiu Elbra, Petr Schnabl, Petr Pruner, Martin Košťák, Zdeněk Vašíček, Andrea SvobodováAbstract:Abstract A high-resolution multidisciplinary study of two profiles in the Kotouc Quarry at Stramberk was carried out to define the age and palaeoenvironmental setting of the peri-reefal Stramberk Limestone. Calpionellids of the Alpina and Ferasini subzones of the standard Calpionella Zone confirm an early Berriasian age for both studied sequences. The presence of the calcareous nannofossils Nannoconus kamptneri minor and ?Speetonia colligata supports this stratigraphic interpretation. An ammonite assemblage with Pseudosubplanites grandis was found corresponding to the upper part of the lower Berriasian (Grandis Subzone). Foraminiferan assemblages contain several taxa previously reported from the Valanginian. Magnetostratigraphy verifies that the studied sections span the magnetozones M18r to M18n. Rock magnetic measurements indicate magnetite as the carrier of characteristic remanent magnetization. A palaeolatitude suggested location at 36°N. Microfacies indicate palaeoenvironments of slope (FZ 4), platform margin reefs, sand shoals (FZ 5, FZ 6) and possibly patch-reefs in the inner platform (FZ 7). The presence of Calpionellids and the polychaete Terebella lapilloides suggests deposition within the deeper parts of the outer ramp of a platform slope, with redeposited clasts derived from nearby reef slopes and/or talus. This research contributes to the Berriasian Working Group's efforts to define the Tithonian–Berriasian boundary.
-
The Jurassic/Cretaceous boundary and high resolution biostratigraphy of the pelagic sequences of the kurovice section (Outer Western Carpathians, the northern Tethyan margin)
Geologica Carpathica, 2019Co-Authors: Andrea Svobodová, Daniela Reháková, Lilian Švábenická, Marcela Svobodová, Petr Skupien, Tiiu Elbra, Petr SchnablAbstract:Abstract Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on Calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic/Cretaceous (J/K) boundary. The Kurovice section consists of allodapic and micrite limestones and marlstones. Identified standard microfacies types SMF 2, SMF 3 and SMF 4 indicate that sediments were deposited on a deep shelf margin (FZ 3), with a change, later, into distal basin conditions and sediments (FZ 1). The sequence spans a stratigraphic range from the Early Tithonian calcareous dinoflagellate Malmica Zone, nannoplankton zone NJT 15 and magnetozone M 21r to the late Early Berriasian calpionellid Elliptica Subzone of the Calpionella Zone, nannoplankton NK-1 Zone and M 17r magnetozone. The J/K boundary is marked by a quantitative increase of small forms of Calpionella alpina, the base of the Alpina Subzone (that corresponds to NJT 17b and M 19n.2n) and by the rare occurrence of Nannoconus wintereri. Palynomorphs include Early Berriasian terrestrial elements — non-calcareous dinoflagellate cysts Achomosphaera neptunii, Prolixosphaeridium sp. A and Tehamadinium evittii. The depositional area for Kurovice was situated at the margin of the NW Tethys. The influence of cold waters from northern latitudes and potential upwellings is highlighted by: 1) the high proportion of radiolarians and sponge spicules, 2) rare Calpionellids represented mostly by hyaline forms, 3) the absence of microgranular Calpionellids — chitinoidellids, 4) the small percentage of the genera Nannoconus, Polycostella and Conusphaera in nannofossil assemblages, as compared to other sites in Tethys, 5) scarce Nannoconus compressus, which has otherwise been mentioned from the Atlantic area.
-
dinoflagellates and Calpionellids of the jurassic cretaceous boundary outer western carpathians czech republic
Cretaceous Research, 2019Co-Authors: Petr Skupien, Pavlina DoupovcovaAbstract:Abstract A palynological analysis and study of Calpionellids and calcareous dinoflagellate cysts across the Jurassic–Cretaceous (J/K) boundary succession in the Outer Western Carpathians, Bruzovice section is presented. It is a one of few sections of the Tethyan Realm suitable for the palynological study. The lower part of the section is formed by anoxic deposits consisting of dark grey calcareous claystones. The upper part of the profile is represented by flysch-like alternation of grey limestones, spotted claystones and marlstones. The section spans the stratigraphic range from the upper Tithonian, Cadosina semiradiata calcareous dinoflagellate Zone to the lower Berriasian, calpionellid Calpionella elliptica Subzone. The J/K boundary is marked by a high abundance of small forms of Calpionella alpina . The Tithonian–Berriasian succession of non–calcareous dinoflagellates is as follows: the base of the section is correlated with the dinocyst Semiradiata Zone along with the presence of Glossodinium dimorphum. The first occurrence (FO) of Amphorula metaelliptica and the last occurrence (LO) of Prolixosphaeridium anasillum are recorded in the Cadosina semiradiata Zone followed by the Cadosina tenuis – Colomisphaera fortis Zone. An aboudance of the spherical C. alpina indicates the onset of the Calpionella Zone and the Calpionella alpina Subzone at the base of the Berriasian Stage. The FO of Diacanthum hollisteri is situated in the lower part of the Calpionella alpina Subzone. The FO of Dichadogonyaulax bensonii coincides approximately with the base of the calpionellid Remaniella ferasini Subzone, and the FO´s of Muderongia longicorna, M. tabulata and Spiniferites cf. ramosus were found in the upper part of the calpionellid Remaniella ferasini Subzone. The FO of Achomosphaera neptunii was found in the lower part of the Calpionella elliptica Subzone. The work is a contribution to the ICS Berriasian Working Group.
-
Dinoflagellates and Calpionellids of the Jurassic–Cretaceous boundary, Outer Western Carpathians (Czech Republic)
Cretaceous Research, 2019Co-Authors: Petr Skupien, Pavlina DoupovcovaAbstract:Abstract A palynological analysis and study of Calpionellids and calcareous dinoflagellate cysts across the Jurassic–Cretaceous (J/K) boundary succession in the Outer Western Carpathians, Bruzovice section is presented. It is a one of few sections of the Tethyan Realm suitable for the palynological study. The lower part of the section is formed by anoxic deposits consisting of dark grey calcareous claystones. The upper part of the profile is represented by flysch-like alternation of grey limestones, spotted claystones and marlstones. The section spans the stratigraphic range from the upper Tithonian, Cadosina semiradiata calcareous dinoflagellate Zone to the lower Berriasian, calpionellid Calpionella elliptica Subzone. The J/K boundary is marked by a high abundance of small forms of Calpionella alpina . The Tithonian–Berriasian succession of non–calcareous dinoflagellates is as follows: the base of the section is correlated with the dinocyst Semiradiata Zone along with the presence of Glossodinium dimorphum. The first occurrence (FO) of Amphorula metaelliptica and the last occurrence (LO) of Prolixosphaeridium anasillum are recorded in the Cadosina semiradiata Zone followed by the Cadosina tenuis – Colomisphaera fortis Zone. An aboudance of the spherical C. alpina indicates the onset of the Calpionella Zone and the Calpionella alpina Subzone at the base of the Berriasian Stage. The FO of Diacanthum hollisteri is situated in the lower part of the Calpionella alpina Subzone. The FO of Dichadogonyaulax bensonii coincides approximately with the base of the calpionellid Remaniella ferasini Subzone, and the FO´s of Muderongia longicorna, M. tabulata and Spiniferites cf. ramosus were found in the upper part of the calpionellid Remaniella ferasini Subzone. The FO of Achomosphaera neptunii was found in the lower part of the Calpionella elliptica Subzone. The work is a contribution to the ICS Berriasian Working Group.
-
Biostratigraphy of the Lower Cretaceous limestones of the Godula facies of the Silesian Unit, Outer Western Carpathians
2004Co-Authors: Daniela Boorová, Petr SkupienAbstract:Microfacies and microfossils were studied in the isolated bodies of detritic limestone outcrops in the western part of the Silesian Unit near the town of Měrkovice. The total limestone thickness reaches up to ten metres. Fossil remnants observed in thin sections give clear evidence of a reef to sublittoral shallow-sea source area for these deposits, which the present authors believe to be the Baska ridge. Assemblages of Calpionellids of the Middle Berriasian (representing the standard Calpionella Biozone, and the Elliptica and Longa Subzones) were identified in the fine-grained limestones. Transi- tional deposits between the limestones and the overlying dark grey pelitic flysch sediments yielded noncalcareous dinoflagellates of the Late Berriasian and lower Early Valanginian age.
Pavlina Doupovcova - One of the best experts on this subject based on the ideXlab platform.
-
dinoflagellates and Calpionellids of the jurassic cretaceous boundary outer western carpathians czech republic
Cretaceous Research, 2019Co-Authors: Petr Skupien, Pavlina DoupovcovaAbstract:Abstract A palynological analysis and study of Calpionellids and calcareous dinoflagellate cysts across the Jurassic–Cretaceous (J/K) boundary succession in the Outer Western Carpathians, Bruzovice section is presented. It is a one of few sections of the Tethyan Realm suitable for the palynological study. The lower part of the section is formed by anoxic deposits consisting of dark grey calcareous claystones. The upper part of the profile is represented by flysch-like alternation of grey limestones, spotted claystones and marlstones. The section spans the stratigraphic range from the upper Tithonian, Cadosina semiradiata calcareous dinoflagellate Zone to the lower Berriasian, calpionellid Calpionella elliptica Subzone. The J/K boundary is marked by a high abundance of small forms of Calpionella alpina . The Tithonian–Berriasian succession of non–calcareous dinoflagellates is as follows: the base of the section is correlated with the dinocyst Semiradiata Zone along with the presence of Glossodinium dimorphum. The first occurrence (FO) of Amphorula metaelliptica and the last occurrence (LO) of Prolixosphaeridium anasillum are recorded in the Cadosina semiradiata Zone followed by the Cadosina tenuis – Colomisphaera fortis Zone. An aboudance of the spherical C. alpina indicates the onset of the Calpionella Zone and the Calpionella alpina Subzone at the base of the Berriasian Stage. The FO of Diacanthum hollisteri is situated in the lower part of the Calpionella alpina Subzone. The FO of Dichadogonyaulax bensonii coincides approximately with the base of the calpionellid Remaniella ferasini Subzone, and the FO´s of Muderongia longicorna, M. tabulata and Spiniferites cf. ramosus were found in the upper part of the calpionellid Remaniella ferasini Subzone. The FO of Achomosphaera neptunii was found in the lower part of the Calpionella elliptica Subzone. The work is a contribution to the ICS Berriasian Working Group.
-
Dinoflagellates and Calpionellids of the Jurassic–Cretaceous boundary, Outer Western Carpathians (Czech Republic)
Cretaceous Research, 2019Co-Authors: Petr Skupien, Pavlina DoupovcovaAbstract:Abstract A palynological analysis and study of Calpionellids and calcareous dinoflagellate cysts across the Jurassic–Cretaceous (J/K) boundary succession in the Outer Western Carpathians, Bruzovice section is presented. It is a one of few sections of the Tethyan Realm suitable for the palynological study. The lower part of the section is formed by anoxic deposits consisting of dark grey calcareous claystones. The upper part of the profile is represented by flysch-like alternation of grey limestones, spotted claystones and marlstones. The section spans the stratigraphic range from the upper Tithonian, Cadosina semiradiata calcareous dinoflagellate Zone to the lower Berriasian, calpionellid Calpionella elliptica Subzone. The J/K boundary is marked by a high abundance of small forms of Calpionella alpina . The Tithonian–Berriasian succession of non–calcareous dinoflagellates is as follows: the base of the section is correlated with the dinocyst Semiradiata Zone along with the presence of Glossodinium dimorphum. The first occurrence (FO) of Amphorula metaelliptica and the last occurrence (LO) of Prolixosphaeridium anasillum are recorded in the Cadosina semiradiata Zone followed by the Cadosina tenuis – Colomisphaera fortis Zone. An aboudance of the spherical C. alpina indicates the onset of the Calpionella Zone and the Calpionella alpina Subzone at the base of the Berriasian Stage. The FO of Diacanthum hollisteri is situated in the lower part of the Calpionella alpina Subzone. The FO of Dichadogonyaulax bensonii coincides approximately with the base of the calpionellid Remaniella ferasini Subzone, and the FO´s of Muderongia longicorna, M. tabulata and Spiniferites cf. ramosus were found in the upper part of the calpionellid Remaniella ferasini Subzone. The FO of Achomosphaera neptunii was found in the lower part of the Calpionella elliptica Subzone. The work is a contribution to the ICS Berriasian Working Group.
Fabio Hering - One of the best experts on this subject based on the ideXlab platform.
-
A coral-rich unit of Berriasian (Early Cretaceous) age in the Sierra Madre Oriental of northeastern Mexico
Journal of South American Earth Sciences, 2016Co-Authors: Patrick Zell, Wolfgang Stinnesbeck, Fabio HeringAbstract:Abstract A coral-rich Berriasian unit locally known as the San Juan Lentil conforms the basal Taraises Formation in the San Juan canyon located half distance between the cities of Saltillo and Monterrey in northeastern Mexico. Here we document the environmental conditions and discuss its regional distribution of this biostrome unit. Calpionellids are intermittently present and indicate a middle to late Berriasian age for the coral-bearing unit that was deposited during an interval of increased oligotrophic conditions.
-
the berriasian valanginian early cretaceous boundary transition at santa catarina ticua oaxaca state southern mexico ammonites bivalves Calpionellids and their paleobiogeographic significance
Journal of South American Earth Sciences, 2015Co-Authors: Patrick Zell, Thierry Adatte, Wolfgang Stinnesbeck, Seija Beckmann, Fabio HeringAbstract:Abstract Ammonites, bivalves and Calpionellids of the late Berriasian-early Valanginian from southern Mexico are poorly known; those here described are from the Sabinal Formation at Santa Catarina Ticua, Oaxaca state. Samples were collected and analyzed bed-by-bed. Ammonite assemblages correlate to the West Mediterranean late Berriasian Subthurmannia boissieri and early Valanginian Thurmanniceras pertransiens and Neocomites neocomiensiformis zones and contain taxa, which are majorly endemic, although a few European species are also identified. The bivalve Arctotis cretacea (Felix, 1891) is common in several horizons throughout the section. Calpionellids are present in the upper part of the Santa Catarina Ticua section and are indicative of the middle Berriasian Remaniella cadischiana Subzone, the late Berriasian Calpionellopsis Zone (including the Calpionellopsis simplex and Cs. oblonga subzones) and the early Valanginian Calpionellites darderi Subzone. Our data indicate that biogeographic correlation of faunal and environmental changes is possible across the Berriasian–Valanginian boundary between southern Mexico and faunal realms of the southwestern Gulf of Mexico and the western Tethys, and thus throughout the western hemisphere.
-
The Berriasian–Valanginian (Early Cretaceous) boundary transition at Santa Catarina Ticuá, Oaxaca state, southern Mexico: Ammonites, bivalves, Calpionellids and their paleobiogeographic significance
Journal of South American Earth Sciences, 2015Co-Authors: Patrick Zell, Thierry Adatte, Wolfgang Stinnesbeck, Seija Beckmann, Fabio HeringAbstract:Ammonites, bivalves and Calpionellids of the late Berriasian-early Valanginian from southern Mexico are poorly known; those here described are from the Sabinal Formation at Santa Catarina Ticua, Oaxaca state. Samples were collected and analyzed bed-by-bed. Ammonite assemblages correlate to the West Mediterranean late Berriasian Subthurmannia boissieri and early Valanginian Thurmanniceras pertransiens and Neocomites neocomiensiformis zones and contain taxa, which are majorly endemic, although a few European species are also identified. The bivalve Arctotis cretacea (Felix, 1891) is common in several horizons throughout the section. Calpionellids are present in the upper part of the Santa Catarina Ticua section and are indicative of the middle Berriasian Remaniella cadischiana Subzone, the late Berriasian Calpionellopsis Zone (including the Calpionellopsis simplex and Cs. oblonga subzones) and the early Valanginian Calpionellites darderi Subzone. Our data indicate that biogeographic correlation of faunal and environmental changes is possible across the Berriasian–Valanginian boundary between southern Mexico and faunal realms of the southwestern Gulf of Mexico and the western Tethys, and thus throughout the western hemisphere.
Wolfgang Stinnesbeck - One of the best experts on this subject based on the ideXlab platform.
-
A coral-rich unit of Berriasian (Early Cretaceous) age in the Sierra Madre Oriental of northeastern Mexico
Journal of South American Earth Sciences, 2016Co-Authors: Patrick Zell, Wolfgang Stinnesbeck, Fabio HeringAbstract:Abstract A coral-rich Berriasian unit locally known as the San Juan Lentil conforms the basal Taraises Formation in the San Juan canyon located half distance between the cities of Saltillo and Monterrey in northeastern Mexico. Here we document the environmental conditions and discuss its regional distribution of this biostrome unit. Calpionellids are intermittently present and indicate a middle to late Berriasian age for the coral-bearing unit that was deposited during an interval of increased oligotrophic conditions.
-
the berriasian valanginian early cretaceous boundary transition at santa catarina ticua oaxaca state southern mexico ammonites bivalves Calpionellids and their paleobiogeographic significance
Journal of South American Earth Sciences, 2015Co-Authors: Patrick Zell, Thierry Adatte, Wolfgang Stinnesbeck, Seija Beckmann, Fabio HeringAbstract:Abstract Ammonites, bivalves and Calpionellids of the late Berriasian-early Valanginian from southern Mexico are poorly known; those here described are from the Sabinal Formation at Santa Catarina Ticua, Oaxaca state. Samples were collected and analyzed bed-by-bed. Ammonite assemblages correlate to the West Mediterranean late Berriasian Subthurmannia boissieri and early Valanginian Thurmanniceras pertransiens and Neocomites neocomiensiformis zones and contain taxa, which are majorly endemic, although a few European species are also identified. The bivalve Arctotis cretacea (Felix, 1891) is common in several horizons throughout the section. Calpionellids are present in the upper part of the Santa Catarina Ticua section and are indicative of the middle Berriasian Remaniella cadischiana Subzone, the late Berriasian Calpionellopsis Zone (including the Calpionellopsis simplex and Cs. oblonga subzones) and the early Valanginian Calpionellites darderi Subzone. Our data indicate that biogeographic correlation of faunal and environmental changes is possible across the Berriasian–Valanginian boundary between southern Mexico and faunal realms of the southwestern Gulf of Mexico and the western Tethys, and thus throughout the western hemisphere.
-
The Berriasian–Valanginian (Early Cretaceous) boundary transition at Santa Catarina Ticuá, Oaxaca state, southern Mexico: Ammonites, bivalves, Calpionellids and their paleobiogeographic significance
Journal of South American Earth Sciences, 2015Co-Authors: Patrick Zell, Thierry Adatte, Wolfgang Stinnesbeck, Seija Beckmann, Fabio HeringAbstract:Ammonites, bivalves and Calpionellids of the late Berriasian-early Valanginian from southern Mexico are poorly known; those here described are from the Sabinal Formation at Santa Catarina Ticua, Oaxaca state. Samples were collected and analyzed bed-by-bed. Ammonite assemblages correlate to the West Mediterranean late Berriasian Subthurmannia boissieri and early Valanginian Thurmanniceras pertransiens and Neocomites neocomiensiformis zones and contain taxa, which are majorly endemic, although a few European species are also identified. The bivalve Arctotis cretacea (Felix, 1891) is common in several horizons throughout the section. Calpionellids are present in the upper part of the Santa Catarina Ticua section and are indicative of the middle Berriasian Remaniella cadischiana Subzone, the late Berriasian Calpionellopsis Zone (including the Calpionellopsis simplex and Cs. oblonga subzones) and the early Valanginian Calpionellites darderi Subzone. Our data indicate that biogeographic correlation of faunal and environmental changes is possible across the Berriasian–Valanginian boundary between southern Mexico and faunal realms of the southwestern Gulf of Mexico and the western Tethys, and thus throughout the western hemisphere.
-
AAPG Memoir 75, Chapter 16: Correlation of a Valanginian Stable Isotopic Excursion in Northeastern Mexico with the European Tethys
2001Co-Authors: Thierry Adatte, Wolfgang Stinnesbeck, Hans Hubberten, Jrgen Remane, Josguadalupe Lpez-olivaAbstract:In the Sierra Madre Oriental of northeastern Mexico, two sections (La Huasteca and San Lucas) spanning Berriasian to lower Hauterivian rocks were analysed and are correlated by mean of calpionellid and ammonite ocurrences, microfacies, and stable isotopes (bulk rock). A major isotopic excursion (approximately 3o/oo) of both 13C and 18O was recognized in an interval of pelagic mudstone corresponding to the upper Valanginian. A similar 13C excursion was also observed in coeval strata of the southern Italian Alps and Appennines (Weissert and Channell., 1985; Weissert et al., 1989; Weissert and Lini, 1991; Lini et al., 1992); the northern Tethys margin (Fllmi et al. 1994); the Gulf of Mexico (Patton et al., 1984); and the North Atlantic (Robertson and Bliefnick, 1983) and Pacific (Douglas and Savin, 1973) Oceans. The 13C shift is independent of changes in microfacies, contents in organic matter, and mineralogical composition of the sediment. This stable isotopic pattern was also identified in the Vocontian basin in France (Hennig et al., 1999), and calibrated to the Campylotoxus-Verrucosum zones of the early/late Valanginian. Integration of our biostratigraphic and isotopic data indicates the presence, at San Lucas, of a complete Valanginian sequence in terms of European ammonite and calpionellid zones, whereas at La Huasteca some of the zones may be absent.
-
Paleoceanographic changes at the Jurassic–Cretaceous boundary in the Western Tethys, northeastern Mexico
Cretaceous Research, 1996Co-Authors: Thierry Adatte, Wolfgang Stinnesbeck, Jurgen Remane, Hans HubbertenAbstract:Abstract Mexico is usually considered to have formed the western end of the Tethys during Late Jurassic and Early Cretaceous times. The circumstances of the opening of the Gulf of Mexico Basin towards the Tethys and the exact stratigraphic timing, however, are not clear. Four sections covering this time interval, located in northeastern Mexico, have been measured and sampled in detail, in order to clarify their stratigraphic position during the Late Jurassic to Early Cretaceous time interval and the paleogeographic and oceanographic changes that accompanied this opening. Our studies include microfacies, micro- and macropaleontology, whole rock and clay-mineral x-ray diffraction and stable isotopes analyses. Our data indicate that the Jurassic-Cretaceous boundary, as defined by the Lyon-Neuchâtel Colloquium of 1973, cannot be determined precisely in northeastern Mexico due to the near-absence of Calpionellids and endemism of ammonite taxa. In the lower and upper Berriasian sediments, we detected Mediterranean ammonite taxa so far unknown from Mexico, corresponding to the appearance of typical calpionellid-rich facies. These faunas allow direct biostratigraphic correlation with European ammonite and calpionellid zones. We propose that a major oceanographic change occurred in the upper part of calpionellid Zone B of the Early Berriasian. At this time, sediments in northeastern Mexico present increasingly pelagic facies, a dramatic appearance of Tethyan microfossils (Calpionellids) and ammonites, changes in stable isotopic values, whole rock and clay-mineral mineralogy. We suggest that these changes are due to a global sea-level rise that connected directly northeastern Mexico to the European Tethys and ended the endemic, semi-restricted and anoxic environment of the Late Jurassic La Casita and equivalent La Caja and La Pimienta Formations.
