The carbonate succession in the Lyalintsi section of the western Moesian Platform (western Bulgaria) displays a shallowing-upward trend. Growth of the Tithonian–Valanginian coral biostromes and low-relief bioherms was preceded by Oxfordian–Kimmeridgian sedimentation of fine-grained peloidal-bioclastic limestones and Saccocoma-bearing limestones on the homoclinal ramp and the carbonate platform slope. In the late Kimmeridgian, boundstones with very rare corals, but with easily recognisable biohermal morphology, were developed. The main components of this reef are encrusting microorganisms, microbial crusts and synsedimentary cements. Microencrusters Labes atramentosa, Crescentiella morronensis, Perturbatacrusta leini and Radiomura cautica, as well as thin crusts of calcified sponges (sclerosponges), are the main biotic components. Corals (almost exclusively microsolenids) are sparse, whereas photophilic microencrusters (e.g., “Lithocodium–Bacinella”), are absent, although they are common in the overlying shallow-water part of the Lyalintsi sequence. Microbialites and synsedimentary cements provided additional support for the reef framework. The framework, especially the biotic components, and the reefal facies position within the sedimentary succession, implies that the high-energy upper slope of the carbonate platform was the depositional setting of the microencruster-microbial-cement reef studied. Encrusting microorganisms, except for C. morronensis and sponges, are only known from the intra-Tethyan platforms. This study supports conclusion of studies of coeval Alpine reefs that the presence of the microencruster-microbial-cement framework provides insight into the palaeobathymetry, palaeogeography and tectonic configuration of the intra-Tethyan carbonate platforms.

西部Moesian平台（保加利亚西部）的Lyalintsi段的碳酸盐岩演替显示出浅度向上的趋势。Tithonian-Valanginian珊瑚生物层和低浮雕生物礁的生长之前，是由牛津-Kimmeridgian沉积的细斜晶系生物碎屑石灰石和含Saccocoma的石灰石在同斜坡和碳酸盐岩台地斜坡上的沉积。在Kimmeridgian晚期，开发了具有非常罕见的珊瑚但具有易于识别的生物体形态的界石。这个礁石的主要成分是包壳微生物，微生物结壳和沉积水泥。微包皮拉布拉草，克雷森氏菌，雷氏百草枯和放射菌以及钙化海绵的薄皮（硬化海绵）是主要的生物成分。珊瑚（几乎完全是微类蛇食）稀疏，而亲光的微壳（例如，Lithocodium–Bacinella）则不存在，尽管它们在Lyalintsi序列的上覆浅水区很常见。微生物和胶结水泥为珊瑚礁框架提供了额外的支持。该框架，尤其是生物成分，以及沉积相中礁石相的位置，暗示着碳酸盐岩平台的高能上坡是所研究的微壳-微生物-水泥礁的沉积环境。包裹微生物，除了C. morronensis海绵和海绵仅在特提斯内部平台中知道。这项研究支持对中世纪高山珊瑚礁研究的结论，即微壳-微生物-水泥框架的存在为特提斯碳酸盐岩内部碳酸盐台地的古生物测量，古地理和构造构造提供了见识。