During the Early Miocene (Early Burdigalian/Eggenburgian) marine transgression at the southeastern margin of the Bohemian Massif, gradual flooding occurred along a rocky coast on granitic bedrock of the Thaya Batholith under high-energy, wave-dominated, microtidal and mixed fair-weather and storm conditions. Deposits of the Burgschleinitz Formation overlie a basal unconformity above a subaerial weathered basement surface (transgressive erosional surface) and are interpreted as a transgressive systems tract. The deposits can be divided into four facies associations/depositional environments, i.e., upper-shoreface, foreshore, gravelly beach and backshore/lagoon. Two stages of transgression and successive overtopping of the basement, with different coastal physiographies, were documented. During the initial stage of transgression a barrier island system developed with relatively fine-grained deposits, reflecting the flooding of the distant parts of the Thaya Batholith with a relative flat basement morphology. The subsequent continuation of the transgression led to the flooding of the more proximal parts of the Thaya Batholith with a steeper relief and formation of a rocky shoreline with deposition of gravelly sediments along palaeo-sea cliffs or wave-cut platforms. While gravel clasts of the deposits investigated originate directly from the underlying granites of the Thaya Batholith, provenance studies show that metamorphic rocks of the Moravian Superunit in the hinterland were the main source of sands. This distant source material was probably delivered mainly by small creeks and alluvial fans to the nearshore. Significant differences in heavy mineral composition of the same formation in the wider vicinity indicate primarily local sources and rapid deposition with subordinate longshore transport, which may reflect a complex coastal palaeogeography. The Lower Miocene deposits of the Burgschleinitz Formation investigated are a rare example of ancient rocky shore deposits, which generally have low preservation potential in the geological record.

在波希米亚地块东南缘的早中新世（早布尔迪加利/埃根堡期）海侵期间，在高能、波浪主导、微潮汐和混合晴天的情况下，沿着 Thaya 岩基花岗岩基岩的岩石海岸逐渐发生洪水和风暴条件。Burgschleinitz 地层的沉积物覆盖在陆上风化基底表面（海侵侵蚀表面）上方的基底不整合面上，并被解释为海侵体系域。沉积可分为上滨面、前滨、砾滩和后滨/泻湖四种相组合/沉积环境。记录了具有不同沿海地貌的地下室的两个海侵阶段和连续漫溢阶段。在海侵的初始阶段，发育了具有相对细粒沉积物的障壁岛系统，反映了具有相对平坦基底形态的 Thaya 岩基远处部分的泛滥。随后海侵的继续导致 Thaya 岩基的更近端部分被洪水淹没，地势更陡峭，并形成岩石海岸线，沿着古海悬崖或波浪切割平台沉积砾石沉积物。虽然所研究矿床的砾石碎屑直接来自 Thaya Batholith 的下伏花岗岩，但物源研究表明，腹地摩拉维亚超单元的变质岩是沙子的主要来源。这种遥远的源材料可能主要由小溪和冲积扇输送到近岸。在更广泛的附近，同一地层的重矿物成分存在显着差异，这表明主要是本地来源和快速沉积以及从属的沿岸运输，这可能反映了复杂的沿海古地理。调查的 Burgschleinitz 地层下中新世沉积物是古代岩石海岸沉积物的罕见例子，在地质记录中通常保存潜力较低。