The Cenomanian–Turonian boundary (CTB) on the intra-Tethyan Adriatic Carbonate Platform (AdCP) is generally characterised by a transition between microbially laminated and/or bioclastic limestones to calcisphere-rich massive limestone with bioturbated intervals, organic-rich interbeds, firmgrounds, as well as neptunian dikes, carbonate turbidites, tempestites and slumped structures. Compilation of the results from two study sites in the northwestern part of the AdCP and from previous research (on Istria Peninsula and islands in the Adriatic Sea in Croatia) provides a more complete overview of geological events and paleoenvironmental conditions that transformed the formerly contiguous shallow-marine environments during this time period. For the first time, a comparison between protected inner-platform area (Barban section) and a coeval intra-platform basin (Premuda Island section) during the CTB was made. This study utilized a combination of litho-, bio-, and microfacies studies with SEM, EDS, TOC, δ¹³C and δ¹⁸O stable isotope analyses. The stratigraphic successions start with shallow-marine carbonate deposits of the Milna Formation that is conformably overlain by the drowned-platform deposits of the Sveti Duh Formation on the platform and by the Veli Rat Formation in the contemporaneously developed intraplatform basin. These deposits are in turn overlain by the Gornji Humac Formation, which represents re-establishment of shallow-marine depositional systems on the AdCP, whereas the deeper water environment persisted in the intra-platform basin until the Santonian.

Despite diagenetic modifications of shallow-marine carbonate deposits, the results of TOC and stable isotope analyses indicate the influence of global Oceanic Anoxic Event 2 (OAE2). Combination of local and regional synsedimentary tectonics and global Late Cretaceous sea-level changes accompanied by anoxic and hypoxic conditions, extinction of numerous benthic foraminifera, diversification and expansion of planktonic foraminifera and calcareous dinoflagellates, provide new insights into the character of the CTB interval in this part of the Tethyan realm.

特提斯内亚得里亚海碳酸盐台地（AdCP）上的Cenomanian-Turonian边界（CTB）通常具有以下特征：微生物层压和/或生物碎屑石灰石到富含生物扰动间隔的富含气圈的块状石灰石，富含有机物的夹层，坚硬的地面，以及海王星堤防，碳酸盐浊度，风暴石和坍塌的构造。来自AdCP西北部两个研究地点和先前研究（在伊斯特拉半岛和克罗地亚亚得里亚海的岛屿上）的结果汇编提供了更完整的地质事件和古环境条件的概述，这些地质事件和古环境条件改变了以前毗邻的浅海地区。在这段时间内的海洋环境。首次，比较了CTB期间受保护的内部平台区域（Barban区域）和同时代的平台内盆地（Premuda Island区域）。这项研究结合了岩石相，生物相和微相研究与SEM，EDS，TOC和δ的组合¹³ C和δ ¹⁸ ö稳定同位素分析。地层演替始于米尔纳组的浅海碳酸盐岩矿床，该层被平台上Sveti Duh组的淹没式平台沉积物以及同期发育的台内盆地中的Veli Rat组覆盖。这些沉积物依次由Gornji Humac组覆盖，这代表了AdCP上浅海沉积系统的重建，而较深的水环境一直持续到平台内盆地，直到Santonian为止。

尽管浅海碳酸盐岩沉积有成岩作用，但TOC和稳定同位素分析的结果仍表明了全球海洋缺氧事件2（OAE2）的影响。局部和区域沉积构造与全球白垩纪晚期海平面变化的结合，伴随着缺氧和低氧条件，大量底栖有孔虫的灭绝，浮游有孔虫的多样化和扩展以及钙质鞭毛鞭毛虫，为CTB间隔的特征提供了新的见解Tethyan领域的一部分。