The area of Ptuj has been continuously inhabited since the earliest periods of prehistory and, with its unique geographical location, has always played an important strategic role. The area of Krško was sparsely populated in the past, but artefacts from various periods up to the Neolithic have also been found in this area. As a result, during the development works in these two cities between 2021 and 2023, it was necessary to provide archaeological excavations during which, in addition to other finds, 34 wooden samples were taken, and these were the subject of our research. The samples were examined according to the established method, which includes a detailed examination, mechanical processing, wood identification and measurement of the tree rings for dendrochronological analysis. By embedding the samples in paraffin, permanent microscopic slices were made for identification of the most decomposed samples. The majority of the samples were from oak (Quercus sp.), but we also identified elm (Ulmus sp.), european spruce (Picea abies), poplar (Populus sp.), silver fir (Abies alba), black alder (Alnus glutinosa) and common hazel (Corylus avelana). From the samples from the Ptuj site, we dated four pieces of wood that were found in the backfill of the cellar pit. From three samples we synchronized the chronology of the object and dated it to 1365, while the fourth piece was dated to 1759. From this we conclude that it is possible that the cellar was in use until the end of the 18th century. Among the wooden remains from Krško, we managed to date two oak samples. The dating of the pieces to the year 1786, with the estimated felling of the trees around 1801, does not coincide with the predictions of archaeologists, who, based on the stratigraphic position and typochronological analysis of other artefacts, dated the pieces in the period from the 15th to the 17th century.
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