Macroscopic (A) and microscopic (B) views of the different pôros observed in the archaeological site of Delphi. Microscopic views (B) were obtained with the help of the portable microscope. Red, white and black rectangles in scale is 1 cm. P1: oolitic grainstone composed of micrometric oolites (1); P2: bioclastic grainstone with section of crinoid (2); P3: coarse-grained sandstone with pebbles (3) and shell fragments (4); P4: sandstone showing angular quartz and feldspar; P5: modern travertine and its encrusted shard; P6: red boundstone; P7: marine floatstone with shells impressions (5) and bivalves shells (6).