Hasholme logboat is a late Iron Age boat (750-390 BC) discovered at Hasholme, an area of civil parish of Holme-on-Spalding-Moor in the East Riding of the English county of Yorkshire. It is now on display in the Hull and East Riding Museum, in Hull. The boat was located and excavated at Hasholme, on the north bank of the River Foulness in the broad river channel. The boat was situated in mostly waterlogged clay (silty-clay, silt and sand) deposits, which greatly helped the preservation of the timbers. Apart from the boat itself, the excavations did not produce any major associated artifacts, with the exception of a single pottery shard. For dating purposes two techniques, tree-ring dating and radiocarbon 14C/thermoluminescence, were employed. Both methods gave rather comparable results of some time between 750 and 390 BC, which approximately correlates with the later European Iron Age. Based on reconstruction of the landscape around the site, it is known that it was dominated by mixed oak, birch and alder woodland, with some meadows and marshes, as well as many river tributaries and oxbow lakes. Size The University of Hull described it in 2010 as the largest surviving logboat in the UK. "Parent log" of the boat's hull The hull of the Hasholme logboat was made out of an oak tree (Quercus sp.). After all the measurements of the hull were taken, it was estimated that the parent log (oak log the boat was made of) had to be approximately long with at least circumference. Thus the theoretical weight of this log must have been around 28.5 tons but because of the presence of "heart rot" (the natural process of rotting of the interior of the log) these estimates are exaggerated. Based on the size of the oak and other dendro measurements, it was suggested that this kind of tree was between 810 and 880 years old on felling. Oaks of such advanced age and size must have developed a rot known as "brittle heart", which originates at the base and spreads upward. In the case of Hasholme, this rot spread almost to the very top of the trunk. This meant that even though the hollowing was much easier, the openings on both ends had to be closed and made watertight. It was no accident to select a tree with an extensive rot along its entire length and thus save a tremendous amount of time.