Tournaisian Research Articles

LATEST DEVONIAN (FAMENNIAN) TO EARLIEST CARBONIFEROUS (TOURNAISIAN) BRACHIOPODS FROM THE BACHU FORMATION OF THE TARIM BASIN, XINJIANG PROVINCE, NORTHWEST CHINA

Brachiopods are described from two horizons of the Bachu Formation from the Bachu area of the Tarim Basin, Xinjiang Province, northwest China. We assign the brachiopods from the basal Bachu Formation to late Famennian and correlate those from its upper part to the Eochoristites-Martiniella Assemblage of South China, of early Tournaisian age. The brachiopod fauna of the Bachu Formation exhibits strong generic and specific links with coeval South Chinese faunas, suggesting a close biogeographical affinity with the South China block. Eleven species are described, including one new species, Ptychomaletoechia bachuensis sp. nov.

Корреляционные уровни в верхнем фамене и турне севера Урала и гряды Чернышева

Корреляционные уровни в верхнем фамене и турне севера Урала и гряды Чернышева

О результатах стратификации отложений турнейского яруса на поднятиях с эрозионно-карстовой поверхностью на примере Зюзеевского месторождения

О результатах стратификации отложений турнейского яруса на поднятиях с эрозионно-карстовой поверхностью на примере Зюзеевского месторождения

Перспективы нефтегазоносности турнейских клиноформ Висимской впадины и Соликамской депрессии

Перспективы нефтегазоносности турнейских клиноформ Висимской впадины и Соликамской депрессии

Carbonate formation of the Lower Carboniferous in Central Part of Volga-Ural Basin

Carbonate rocks of the Lower Carboniferous (Tournaisian stage) of the central Volga-Ural basin (the eastern portion of the East European platform) are of practical scientific interest to geologists, particularly because they contain large reserves of oil. Although such layers have been studied, various questions pertaining to development of sedimentation schemes for the rocks have not been answered. We have attempted to resolve these by studying a wealth of drill core materials. The study involved structural and genetic analysis of rocks and facies reconstructions. The rocks are mainly represented by different types of shallowwater limestone. The thickness of coeval layers and their lithological structures changes from well to well within an oilfield, primarily due to the different environments of sedimentation during the Tournaisian stage. Therefore, to identify the characteristics of carbonate sedimentation, we have studied the sequences of different types of limestone and analysed their thickness. As a result, we have developed principle schemes of sedimentation for shallow-water carbonate rocks of the Tournaisian stage. This may help in the predictive search for reservoir rocks in the region of study.

Tournaisian (Early Carboniferous/Mississippian) ammonoids from the Ma'der Basin (Anti-Atlas, Morocco)

Three succeeding assemblages of Early Tournaisian (Mississippian) ammonoids are described from Fezzou (Ma'der) in the Anti-Atlas of Morocco; they are, in ascending order, composed of the following genera: (1) <i>Gattendorfia-Eocanites</i> Assemblage: <i>Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania</i>, and <i>Eocanites</i>; (2) <i>Gattendorfia-Kahlacanites</i> Assemblage: <i>Acutimitoceras, Hasselbachia, Gattendorfia, Becanites</i>, and <i>Kahlacanites</i>; and (3) <i>Goniocyclus-Protocanites</i> Assemblage: <i>Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites</i>, and <i>Protocanites</i>. The following taxa are newly described: <i>Globimitoceras rharrhizense</i> n. sp., <i>Acutimitoceras sarahae</i> n. sp., <i>A. endoserpens</i> n. sp., <i>A. pentaconstrictum</i> n. sp., <i>Costimitoceras aitouamar</i> n. sp., <i>Hasselbachia arca</i> n. sp., <i>Kornia citrus</i> n. gen. n. sp., <i>Gattendorfia lhceni</i> n. sp., and <i>G. gisae</i> n. sp. <br><br> Drei aufeinander folgende Vergesellschaftungen von Ammonoideen aus dem Tournaisium (Mississippium) werden von Fezzou (Ma'der) im Anti-Atlas von Marokko beschrieben; diese werden, in aufsteigender Reihenfolge, durch die folgenden Gattungen zusammen gesetzt: (1) <i>Gattendorfia-Eocanites</i> Assemblage: <i>Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania</i> und <i>Eocanites</i>; (2) <i>Gattendorfia-Kahlacanites</i> Assemblage: <i>Acutimitoceras, Hasselbachia, Gattendorfia, Becanites</i> und <i>Kahlacanites</i>; und (3) <i>Goniocyclus-Protocanites</i> Assemblage: <i>Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites</i> und <i>Protocanites</i>. Die folgenden Taxa werden neu beschrieben: <i>Globimitoceras rharrhizense</i> n. sp., <i>Acutimitoceras sarahae</i> n. sp., <i>A. endoserpens</i> n. sp., <i>A. pentaconstrictum</i> n. sp., <i>Costimitoceras aitouamar</i> n. sp., <i>Hasselbachia arca</i> n. sp., <i>Kornia citrus</i> n. gen. n. sp., <i>Gattendorfia lhceni</i> n. sp. und <i>G. gisae</i> n. sp. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200700003" target="_blank">10.1002/mmng.200700003</a>

Tournaisian (Early Carboniferous/Mississippian) ammonoids from the Ma'der Basin (Anti-Atlas, Morocco)

Abstract. Three succeeding assemblages of Early Tournaisian (Mississippian) ammonoids are described from Fezzou (Ma'der) in the Anti-Atlas of Morocco; they are, in ascending order, composed of the following genera: (1) Gattendorfia-Eocanites Assemblage: Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania, and Eocanites; (2) Gattendorfia-Kahlacanites Assemblage: Acutimitoceras, Hasselbachia, Gattendorfia, Becanites, and Kahlacanites; and (3) Goniocyclus-Protocanites Assemblage: Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites, and Protocanites. The following taxa are newly described: Globimitoceras rharrhizense n. sp., Acutimitoceras sarahae n. sp., A. endoserpens n. sp., A. pentaconstrictum n. sp., Costimitoceras aitouamar n. sp., Hasselbachia arca n. sp., Kornia citrus n. gen. n. sp., Gattendorfia lhceni n. sp., and G. gisae n. sp. Drei aufeinander folgende Vergesellschaftungen von Ammonoideen aus dem Tournaisium (Mississippium) werden von Fezzou (Ma'der) im Anti-Atlas von Marokko beschrieben; diese werden, in aufsteigender Reihenfolge, durch die folgenden Gattungen zusammen gesetzt: (1) Gattendorfia-Eocanites Assemblage: Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania und Eocanites; (2) Gattendorfia-Kahlacanites Assemblage: Acutimitoceras, Hasselbachia, Gattendorfia, Becanites und Kahlacanites; und (3) Goniocyclus-Protocanites Assemblage: Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites und Protocanites. Die folgenden Taxa werden neu beschrieben: Globimitoceras rharrhizense n. sp., Acutimitoceras sarahae n. sp., A. endoserpens n. sp., A. pentaconstrictum n. sp., Costimitoceras aitouamar n. sp., Hasselbachia arca n. sp., Kornia citrus n. gen. n. sp., Gattendorfia lhceni n. sp. und G. gisae n. sp. doi:10.1002/mmng.200700003

FORAMINIFERAL TIMING OF CARBONATE DEPOSITION ON THE LATE DEVONIAN (FAMENNIAN)-MIDDLE PENNSYLVANIAN (BASHKIRIAN) TENGIZ PLATFORM, KAZAKHSTAN

Calcareous foraminifers provide a time-stratigraphic framework to chronicle the development of the Tengiz carbonate platform that thrived from the latest Devonian (late Famennian) into the Middle Pennsylvanian (late Bashkirian). Correlative zones, based on documented foraminiferal assemblages and expressed primarily in terms of Russian horizons, confirm that the platform grew in a complex pattern of progradation and backstepping from the Tournaisian to late Visean and then underwent a major progradation that was terminated by sea level fall at the end of the Serpukhovian. Favorable conditions for carbonate sedimentation returned in the early Bashkirian and persisted into the late Bashkirian until the platform either was exposed and eroded or buried by siliciclastic deposition. Breaks in the foraminiferal succession point to major depositional hiatuses along the top of the Bashkirian platform, at the Mississippian-Pennsylvanian boundary, and possibly in the late Tournaisian although previous investigations support continuous deposition throughout the latter interval at Tengiz.

FORAMINIFERAL ZONAL STANDARD FOR THE LOWER CARBONIFEROUSOF RUSSIA AND ITS CORRELATION WITH THE CONODONT ZONATION

This paper describes the zonal subdivisions of the revised Foraminiferal Scale of Russia and their correlation to conodont zones and age-equivalent beds in Western Europe and North America. The foraminiferal zonal sequence is documented in key sections and wells that cover the entire Lower Carboniferous. Boundary reference sections are proposed for most Tournaisian and Serpukhovian zones. Major evolutionary trends within the foraminifers are used to define individual zones.