The Santonian-Campanian boundary in Northern Tunisia has been studied in Oued el Khannga section, based on biostratigraphic and paleoecological analysis. The detailed biostratigraphic analysis allows us to define the stratigraphic distribution of diverse planktonic foraminifera and to establish a continuous biozonation. Sixty-six planktonic foraminiferal species belonging to 13 genera have been identified and two Tethyan planktonic foraminiferal zones have been organized, indicating the upper Santonian - lower Campanian age. These zones are: Dicarinella asymetrica (Total Range Zone) and Globotruncanita elevata/Globotruncana arca (Concurrent range zone). A major turn over event was recorded in this interval including the extinction of several species characterized by complex morphotypes with a double keel such as the genera of Dicarinella, Marginotruncana. In fact, the extinction of the index species D. asymetrica is the most important event which defines the Santonian-Campanian boundary. Many representative species of the genera Globotruncanita and Globotruncana occurred, for the first time, in the uppermost of the Santonian and thrived close to the Santonian-Campanian boundary. In addition some surviving species with a simple morphotype, which are considered like opportunistic taxa, crossed the boundary. This various responses of planktonic foraminifera and the fluctuation in diversity and in the number of species may be related to an increase in temperature and a deep outer shelf upper bathyal environment deposit.

基于生物地层学和古生态分析，对突尼斯北部的桑托尼亚-坎帕克边界进行了研究。详细的生物地层学分析使我们能够定义各种浮游有孔虫的地层分布并建立连续的生物区带。已经鉴定出属于13个属的66种浮游有孔虫物种，并且已经组织了两个特提斯浮游有孔虫带，表明上桑托尼时代-下坎帕尼亚时代。这些区域是：非总产白粉虫（总范围区）和Globotruncanita elevata / Globotruncana arca（并发范围区域）。在此间隔内记录了一次重大的翻转事件，包括几种具有双龙骨复杂形态型特征的物种的灭绝，例如，Dicarinella，Marginotruncana属。实际上，索引物种D的灭绝。 非等距线是最重要的事件，它定义了Santonian-Campanian边界。Globotruncanita和Globotruncana属的许多代表性物种首次出现在桑托尼的最上层，并在桑托尼-坎帕尼边界附近兴旺。此外，一些幸存的具有简单形态类型的物种（被视为机会类群）越过了边界。浮游有孔虫的这种不同反应以及物种多样性和物种数量的波动可能与温度升高和深层的上层海底环境沉积有关。