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首页> 外文期刊>Facies >Lunulite bryozoans from Early Pleistocene deposits of SW Umbria (Italy): sedimentological and paleoecological inferences
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Lunulite bryozoans from Early Pleistocene deposits of SW Umbria (Italy): sedimentological and paleoecological inferences

机译：来自西南翁布里亚（意大利）的早更新世沉积的月光岩苔藓虫：沉积学和古生态学推论

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摘要

The occurrence of lunulite bryozoan assemblages in the Early Pleistocene of western Umbria, central Italy, is documented for the first time. Six species within the genera Reussirella, Cupuladria, and Discoporella were recovered. Study sections encompass a wide range of marine coastal deposits varying from beachface to offshore, which developed in the area during the Early Pleistocene (Gelasian to Calabrian) and were locally influenced by river supply. Lunulite bryozoans mainly occur in infra-to circalittoral, bioclastic-rich sand to mud sediments deposited in locally vegetated paleoenvironments, characterized by moderate to low energy and ranging from lower shoreface to offshore. Based on grain-size analysis, coupled with evidence from benthic foraminiferan and mollusc associations, a main bathymetric range of 10-60 m can be inferred for lunulite distribution in the area, with a prevalence in the 30-50-m interval and a subordinate presence down to about 120 m. Lunulite growth was here also conditioned by a warm climate and a temporarily high sedimentation rate.
机译：首次记载了在意大利中部西部翁布里亚的早更新世中发生了月光岩苔藓虫的组合。检索到了Reussirella，Cupuladria和Discoporella属6种。研究部分涵盖了从海滩到近海的各种海洋沿海沉积物，这些沉积物是在更新世早期（盖拉期至卡拉布里亚期）在该地区发育的，并且受到河流供应的局部影响。 Lunulite苔藓虫主要发生在从地下到周围的富含生物碎屑的砂土中，沉积在当地植被古环境中的泥沙中，其特征是能量中等至低，并且从下岸面到近海不等。基于粒度分析，结合底栖有孔虫和软体动物协会的证据，可以推断出该区域的月桂石分布的主要测深范围为10-60 m，普遍发生在30-50 m区间，且次要存在低至约120 m。在这里，Lunulite的生长还受到温暖气候和暂时高沉积速率的制约。

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