The 'grave slab code' baffles expertsApr 12 2007 By Tony Henderson Environment Editor, The Journal What could be a 900-year-old code is baffling archaeologist Peter Ryder. Over the last 30 years Northumberland-based Peter has recorded 700 ancient grave slab covers in the county, plus another 500 each in County Durham and Cumbria. But the carvings found on one 12th-Century slab, which had been recycled and used 300 years later in a church tower, have set Peter a puzzle. Three 12th-Century grave slabs were incorporated into the tower of St Michael and All Angels Church in Newburn, Newcastle. They have been...