York Historic Environment Record

Borehole survey and trial trenching undertaken Nov 24- Jan 25 within the extant Northern House. The overall stratigraphy overlying the superficial geology for the site can be separated broadly into a lower Roman alluvial unit, located between around 3.85m aOD and 4.60-6.60m aOD, an overlying medieval occupation unit, at 6.75-8.10m aOD, and a post-medieval/industrial made ground unit up to the modern concrete. The evaluation trenching element of the works revealed the presence of 19th century domestic and commercial properties from approximately 0.4m below ground level (BGL), probable post-medieval deposits at approximately 1m BGL, and the top of potentially medieval deposits from around 1.4m BGL.