Sedimentary rocks are rarely preserved on reefless volcanic oceanic islands because their sediments are mostly exported from coastal areas towards the deep sea and such islands typically undergo subsidence. In contrast, the exceptional geological record of the uplifted Santa Maria Island (Azores) provides a unique opportunity to gain insight on such coastal systems. This study focuses on a locality at Ponta do Cedro (eastern Santa Maria Island), which features a series of marine fossiliferous sediments wedged between steep lava deltas. As demonstrated by local structure, these sediments correspond to clinoforms deposited on the steep submarine slope of an active volcanic island, implying transport from shallow waters to greater depths and subsequent colonization by benthic communities. Rapid volcanic progradation eventually sealed the deposits, allowing for their preservation and providing a rare snapshot of the ecology during those intervals, in addition to insights on sedimentary dynamics along submarine island slopes. This study reveals spatial relationships between wedges of sedimentary bodies encapsulated by lavas in the Ponta do Cedro section, and interprets depositional processes preserved in those strata based on sedimentological and palaeontological data. The dynamics of the environment are mostly related to relative sea‐level changes, intense volcanic activity and regional uplift during the Neogene.

中文翻译：

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新近纪的海洋沉积物和生物群被包裹在圣玛丽亚岛（亚速尔群岛，东北大西洋）的熔岩流之间：沉积，侵蚀和火山作用之间的相互作用

沉积岩很少保存在无礁火山岛上，因为它们的沉积物大部分是从沿海地区向深海输出的，这些岛通常会沉陷。相比之下，隆起的圣玛丽亚岛（亚速尔群岛）的特殊地质记录提供了一个独特的机会来了解这种沿海系统。这项研究的重点是蓬塔杜塞德罗（东圣玛丽亚岛）的一个地方，其特征是一系列海洋化石沉积物夹在陡峭的熔岩三角洲之间。如局部结构所示，这些沉积物对应于沉积在活跃火山岛海底陡坡上的倾斜岩体，这意味着从浅水向更大深度的运输，以及随后的底栖生物群落定殖。火山的迅速发展最终使沉积物封闭，除了对海底岛屿斜坡沿岸沉积动力学的见解外，还可以保留这些生物并为这些时期提供罕见的生态快照。这项研究揭示了蓬塔杜塞德罗地区熔岩包裹的沉积体楔形之间的空间关系，并根据沉积学和古生物学数据解释了这些地层中保存的沉积过程。在新近纪期间，环境的动力学主要与相对海平面变化，强烈的火山活动和区域隆升有关。这项研究揭示了蓬塔杜塞德罗地区熔岩包裹的沉积体楔形之间的空间关系，并根据沉积学和古生物学数据解释了这些地层中保存的沉积过程。在新近纪期间，环境的动力学主要与相对海平面变化，强烈的火山活动和区域隆升有关。这项研究揭示了蓬塔杜塞德罗地区熔岩包裹的沉积体楔形之间的空间关系，并根据沉积学和古生物学数据解释了这些地层中保存的沉积过程。在新近纪期间，环境的动力学主要与相对海平面变化，强烈的火山活动和区域隆升有关。