Fig. 5: Section of mortar sample F2 and cross-sections. 1–2.

1–2. Upper part of the sample with the finishing layer (A) and first preparatory layer (B). 3–4 Boundary between first (B) and second (C) preparatory layers 5. The boundary between the second (C) and third (D) preparatory layers. 6 Detail of reaction edge in calcareous aggregate (sparitic limestone). NP parallel nicols, NX crossed nicols, Bi bioclast, Frs sedimentary rock fragment, Frv volcanic rock fragment, Li calcareous granule (lime lump).