York Historic Environment Record

Three boreholes and the installation of three instrumented water monitoring points that will record data over a six month period. The borehole evaluation encountered a simple sequence of archaeology extending to depths close to 11m Below Ground Level (BGL) (-2.53m OD). Post-medieval activity was identified most noticeably as the accumulation of alluvial flooding, made-ground deposits and landreclamation. Waterlogging has provided ideal conditions for the preservation of organic material. The waterlogged deposits appear largely to date to the medieval period; they include accumulations of alluvial silts and clays containing shell, animal bone and pottery which likely derive from activities such as dumping in the immediate area. A black gritty organic deposit was also present containing ‘hair-like fibres’ and tiny mollusca remains. The lower alluvial deposits consisted of a light, gritty sandy clay, with some organic and charcoal. Natural was not encountered in any of the boreholes investigated.