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首页> 外文期刊>Ameghiniana: Revista de la Asociacion Paleontologica Argentina >MICROFOSSILS (FORAMINIFERA, OSTRACODA) AND THEIR RESPONSES TO THE PALEOENVIRONMENTAL CHANGES. AN EXAMPLE FROM THE ALLEN FORMATION (UPPER CRETACEOUS), NEUQUEN BASIN, ARGENTINA
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MICROFOSSILS (FORAMINIFERA, OSTRACODA) AND THEIR RESPONSES TO THE PALEOENVIRONMENTAL CHANGES. AN EXAMPLE FROM THE ALLEN FORMATION (UPPER CRETACEOUS), NEUQUEN BASIN, ARGENTINA

机译：微化石（骨灰RAM，OS骨）及其对古环境变化的响应。阿根廷内乌肯盆地艾伦地层（上白垩统）的一个例子

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MICROFOSSILS (FORAMINIFERA, OSTRACODA) AND THEIR RESPONSES TO THE PALEOENVIRONMENTAL CHANGES. AN EXAMPLE FROM THE ALLEN FORMATION (UPPER CRETACEOUS), NEUQUEN BASIN, ARGENTINA. Morphological abnormalities in benthic foraminifer tests and ostracods shells and carapaces from the Allen Formation (late Campanian-early Maastrichtian) in northern Patagonia, Argentina are analized. Abnormal tests of Protelphidium sp. from the Auca Mahuevo section (69 degrees 00'W-37 degrees 30'S) constitute up to 74% of the total specimens. At the section close to Pellegrini lake (68 degrees 00'W-38 degrees 40'S), Cophinia alleniensis Ballent with phenotypic hollow nodes reach near 30% of the total specimens. The sedimentology of the sections and the character of the accompanying microfauna indicate that the morphological deformities in both taxa were probably caused by hypersalinity and/or fluctuations in salinity, and also by eutrophication during deposition of Auca Mahuevo section. Descriptions and systematic updating of both taxa are included.
机译：微化石（骨灰RAM，OS骨）及其对古环境变化的响应。阿根廷内乌肯盆地艾伦地层（白垩纪）的一个例子。对阿根廷北部巴塔哥尼亚北部的艾伦地层（坎帕尼亚-马斯特里赫特晚期）的底栖有孔虫试验，壳和甲壳的形态异常进行了分析。 Protelphidium sp。的异常测试。来自Auca Mahuevo断面（69度00'W-37度30'S）的部分占总标本的74％。在靠近佩莱格里尼湖（68度00'W-38度40'S）的部分，具有表型空心结点的Cophinia alleniensis Ballent接近标本的30％。断层的沉积学和伴随的微动物的特征表明，这两个分类单元的形态变形可能是由于盐度过高和/或盐度波动，以及Auca Mahuevo断面沉积过程中的富营养化引起的。包括对两个分类单元的描述和系统更新。

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