Fig. 5: Clay provenance as a function of time.
From: Testing a hypothesis of technology transfer in the 1100’s between Italy and Denmark
TL-sensitivity versus magnetic susceptibility of bricks dated to the time of erection and those dated later. a Ringsted cathedral, four wall segments dated later than the erection of the building, R51-R70 (blue squares) and R71-R90 (orange triangles); b Ringsted Cathedral, all samples dated to the assumed time of erection, R91-R303 (yellow squares), and all samples dated later, R51-R90 (green circles); c the same for Cerreto; d the same for Sorø.
