OM-11 Oude Maas: IVO-Underwater Evaluation Report

<p>Trident Archaeology was commissioned by WSP to carry out an IVO underwater evaluation (protocol 4103) of OM-11, an anomaly that had been highlighted as of possible archaeological interest located in the Oude Maas, along Hongerlandsedijk, Spijkenisse.</p><p>

The site is a clay mound measuring roughly 4 by 2 meters with irregular edges that rises approximately 0.3 meters above the river-bed. The materials found at the location included natural wood (tree stumps and raw wood), a small number of processed timbers (two posts and two boards), modern waste, a limited number of pottery fragments that date from the late medieval period, five fragments of clay pipe stems, five fragments of animal bones, and fragments of bricks. The variety and composition of the assemblage together with the fact that the finds were recovered from a mobile superficial sandy layer seems to indicate that this is a natural feature that acted as a trap for various debris carried downstream by the river rather than a feature of archaeological interest.</p>

三叉戟考古公司（Trident Archaeology）受WSP委托，依据4103号规程对OM-11开展IVO水下评估（IVO underwater evaluation）。OM-11是一处疑似具备考古价值的异常地貌，位于斯派克尼瑟（Spijkenisse）洪厄兰堤防（Hongerlandsedijk）沿线的旧马斯河（Oude Maas）水域内。

该地貌为一座黏土堆，尺寸约为4米×2米，边缘不规则，高出河床约0.3米。现场出土的遗存包括天然木材（树桩与原木）、少量加工木料（2根立柱与2块木板）、现代废弃物、少量可追溯至中世纪晚期的陶片、5段陶烟斗杆残件、5块动物骨骼残片以及砖块残片。结合本次出土遗存组合的种类与构成，以及所有遗物均采自流动浅层砂层这一细节，可判断该地貌实为一处天然堆积体，仅为河流裹挟的各类碎屑的截留区，而非具备考古价值的人工遗迹。