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Biostratigraphy of a Silurian 'hot' shale from western Iraq

机译:伊拉克西部志留系“热”页岩的生物地层学

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摘要

Graptolites from the upper 'hot' shale from the Akkas-1 well, western Iraq demonstrate that it is of early Wen lock Monograptus riccartonensis Zone age, somewhat younger than the Llandovery age previously ascribed to it. Chitinozoans from the same sample are poorly preserved and can be identified only tentatively. The riccartonensis Zone was characterized globally by lowered sea-levels during an interval (Sheinwoodian) of otherwise high eustatic sea-level. Increased TOC levels have been recognised at this stratigraphical level also at localities on the palaeocontinents Avalonia and Baltica.
机译:伊拉克西部Akkas-1井上层“热”页岩中的石蜡岩表明它处于文洛克Monograptus riccartonensis区的早期,比以前归因于它的Llandovery年龄年轻。来自同一样品的几丁质动物保存不善,只能初步鉴定。 riccartonensis地区的总体特征是,在本来很高的海平面上升的时间间隔内(Sheinwoodian),海平面降低了。在这一地层水平上,在古大陆阿瓦隆和波罗的海地区也认识到TOC含量增加。

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