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Stromatolites Discovered in Nihewan Formation and Their Paleoenvironment

Science China Chemistry 1994年第5期37卷 634-640页

作者：夏正楷张昀杨德军陈铁梅杨全胡艳秋 Department of Geography Peking University Beijing 100871 PRC Department of Geology Peking University Beijing 100871 PRC Chronological Laboratory Peking University Beijing 100871 PRC

Columnar stromatolites have been discovered in two beds of the upper part of the Nihewan Formation, a series of lacustrine deposits. The structure of the stromatolites is characterized by alternation of light, intergranular pore-rich laminae and dark, organic substance-rich laminae. Abundant filamentous algal remains have been discovered in stromatolite laminae, some of them are similar to the species present on the shore of the Caribbean Sea that are living in warmer climate than in the Nihewan area now. With the ESR and U-series age methods, it has been determined that the ages of the lower and upper stromatolite beds are about 130,000 and 93,000 a B. P. , respectively. Compared with many other geologic events taking place during the period in Northern China, we conclude that the two stromatolite beds were formed during the two warmer stages of the Last Interglacial.

关键词： Nihewan fm. stromatolite filamentous algal.

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Hauterivian-Barremian Bivalves from the Boulouha Formation of the Dahar Escarpment, Southern Tunisia: Stratigraphy and Regional Correlation

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Open Journal of Geology 2019年第10期9卷 569-572页

作者： Boukhalfa Kamel Jingeng Sha Soussi Mohamed Gang Li Ben Ali Walid Ouaja Mohamed Faculty of Sciences of Bizerte University of Carthage Jarzouna Tunisia State Key Laboratory of Palaeobiology and Stratigraphy Center for Excellence in Life and Palaeoenvironment Nanjing Institute of Geology and Palaeontology Nanjing China Faculty of Sciences of Tunis University of Tunis El Manar Tunis Tunisia Faculty of Sciences of Gabes University of Gabes Gabes Tunisia

The Lower Cretaceous mixed siliciclastic-carbonate successions of the Boulouha Formation at the type locality in the Dahar escarpment of southern Tunisia have yielded a new discovered assemblage of bivalves which contains Anomia laevigata (Sowerby);Modiolus sp. cf. M. dahuashuensis (Yu et Li);Astarte sp.;and ?Mytilus sp.. The temporal distribution of the Anomia laevigata (Sowerby) and Modiolus sp. cf. M. dahuashuensis (Yu et Li) is limited to the Aptian formations of northeastern China, Japan and Korea, thus we suggest a Hauterivian-Barremian age for the Boulouha Formation. Henceforth, the new biostratigraphic data are used to improve a regional chronostratigraphic correlation between the lower Cretaceous strata of the Saharan Platform domain and those coeval from the Chotts domain.

关键词： Bivalves Hauterivian-Barremian Boulouha fm. Dahar Escarpment Tunisia

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