# Stratigraphic logs

This appendix presents the codifications used for the graphic representation of the stratigraphic logs :

- geological time scale codification from the BRGM (Figure 172),

- RGB colorimetric codification from the Commission for the Geological Map of the World (CGMW) (Figure 173),

- the lithology pattern chart from USGS (Figure 174, Figure 175, Figure 176).

Figure 84 Geological time scale codification from the BRGM.

Figure 85 RGB colorimetric codification from the CGMW.

Figure 86 Lithology pattern codification from USGS (1).

Figure 87 Lithology pattern codification from USGS (2).

Figure 88 Lithology pattern codification from USGS (3).