Table 1 Microstratigraphic hue, thickness, and SEM–EDS analysis results of the inscribed plaque
Microstratigraphic sequence, hue, thickness (μm) | Element mass percent (%) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
C | O | Mg | Al | Si | S | Cl | K | Ca | Fe | Ba | Hg | Pb | |
L8, deep red-brown, approximately 35 | 36.11 | 41.47 | 0.69 | 2.62 | 8.54 | 1.65 | – | 1.22 | 3.71 | 1.27 | 2.72 | – | – |
L7, black, approximately 50 | 71.25 | 28.75 | – | – | – | – | – | – | – | – | – | – | – |
L6, black, 80-125 | 49.05 | 33.26 | – | – | 0.34 | 7.73 | – | – | 9.62 | – | – | – | – |
L5, dusty gray, 135-160 | 22.20 | 47.97 | – | – | – | 13.57 | – | – | 16.26 | – | – | – | – |
L4, gray, 133-165 | 41.68 | 28.86 | – | – | 1.13 | 12.28 | – | – | 16.05 | – | – | – | – |
L3, black, approximately 35 | 72.51 | 24.59 | – | – | 0.51 | 0.87 | – | – | 1.52 | – | – | – | – |
L2, red, approximately 30 | 57.49 | 20.72 | – | – | 0.34 | 2.77 | 0.40 | – | 0.87 | – | – | 14.35 | 3.06 |
L1, white, 10-20 | 38.77 | 38.39 | – | – | 1.69 | 1.03 | – | – | 20.11 | – | – | – | – |