The lids are one of the seldom discovered types of vessels from the Neolithic period, which comes to explain the lack of analyses of the indicated category of ceramic assemblage. This study includes 29 fragments found at the settlements Samovodene, Hotnitsa-Orlovka, Hotnitsa-Kaya bunar situated in the Yantra river valley, as well as Koprivets which is located in the Rusenski Lom basin. The fragments reveal changes in the typology and the variety of the decoration through the entire Late Neolithic period (according to the Bulgarian chronological system – 5500/5400-5000/4900 BC), namely the Hotnitsa, Dudeşti and Vădastra cultures in the Lower Danube region. The absence of any Boian-Bolentineanu traces is not surprising, considering its vague specifics and even questionable existence.
Most of the forms used come from Samovodene (25 pieces), as it is one of the few sites excavated to a greater extent. They belong to cylindrical (with straight or bulging walls) and slightly conical lids. The few sherds from the sites in the vicinity of Hotnitsa and the single from Koprivets show different shapes, characteristic of the very end of this stage. These fragments have rounded conical and spherical profiles. Various ornaments are incrusted with white or on rare occasions red paste.
The lids from North Central Bulgaria, as well as part of the ceramic assemblage, find closest parallels in the Dudeşti and Vădastra material from the Teleorman region, Southern Romania.