The Frasnian carbonate-siliciclastic deposits of the Stipinai Formation exposed in two quarries at Petrašiūnai and Klovainiai (northern Lithuania) show considerable vertical facies changes. The lower part of this succession is dominated by argillaceous dolomitic facies with subordinate fine siliciclastic deposits. They display haloturbation and bioturbation structures, represent a hypersaline lagoonal environment, and record the beginning of the transgression. The middle part of the succession consists of secondary dolostones containing moulds of brachiopods, tetracorals, stromatoporoids and trace fossils of deposit feeders; these were deposited in a shallow subtidal marine environment and represent the deepest sedimentary environment of this succession. This was followed by a lagoonal environment (episodic hypersaline), represented by dolomudstones and marly dolomudstones. The upper part of the succession is built of bedded dolostones which document a shallowing trend. Intercalations of clays and palaeosol horizons record emergence events. Palynostratigraphic data tentatively indicate that the Stipinai Formation represents the Upper Frasnian. The succession can be interpreted as a record of the upper part of a T-R cycle (related to the semichatovae transgression) in the Main Devonian Field of the East European Platform. The Stipinai Formation is distributed across western and central Latvia and has a correlative in the Pomerania Basin (northern Poland).

在 Petrašiūnai 和 Klovainiai（立陶宛北部）的两个采石场出露的 Stipinai 组的 Frasnian 碳酸盐-硅质碎屑沉积物显示出相当大的垂直相变化。该层序下部以泥质白云质相为主，次生细硅质碎屑沉积。它们展示了盐扰和生物扰动结构，代表了高盐泻湖环境，并记录了海侵的开始。层序的中部由次生白云岩组成，含有腕足动物、四珊瑚、层孔虫的霉菌和沉积物饲养者的痕迹化石；这些沉积在浅层潮下带海洋环境中，代表了这一序列中最深的沉积环境。随后是泻湖环境（偶发性高盐），以白云岩和马里白云岩为代表。继承的上部是由记录变浅趋势的层状白云岩构成的。粘土和古土壤层的夹层记录了出现事件。孢粉地层数据初步表明 Stipinai 组代表上弗拉斯阶。演替可以解释为东欧地台主要泥盆系区域的TR循环上部（与semichatovae海侵有关）的记录。Stipinai 组分布在拉脱维亚西部和中部，在波美拉尼亚盆地（波兰北部）有相关性。孢粉地层数据初步表明 Stipinai 组代表上弗拉斯阶。演替可以解释为东欧地台主要泥盆系区域的TR循环上部（与semichatovae海侵有关）的记录。Stipinai 组分布在拉脱维亚西部和中部，在波美拉尼亚盆地（波兰北部）有相关性。孢粉地层数据初步表明 Stipinai 组代表上弗拉斯阶。演替可以解释为东欧地台主要泥盆系区域的TR循环上部（与semichatovae海侵有关）的记录。Stipinai 组分布在拉脱维亚西部和中部，在波美拉尼亚盆地（波兰北部）有相关性。