In 1976, Bordes made a preliminary attempt at correlating the deposits and industries of Pech IV with Pech I and II (see below). At the time, however, the sedimentological analysis of these sites was not yet fully complete. In addition, over the past twenty years, the chronology of the Upper Pleistocene in general and of southwest France in particular has been completely revised. New work was started at Pech I, and we recently finished our revision of Pech IV. Pech II could perhaps benefit from additional work as well. In 2015 we published a paper using OSL to correlate the three sites (Jacobs et al. 2016). This work supported Bordes' proposal reasonably well.
| Pech I | Pech II | Pech IV | ||||
| Climatic Phase | Level | Industry | Level | Industry | Level | Industry |
| Würm II | 6-7 | MTA B | F1-F2 | MTA B | ||
| Würm II | 5 | MTA A-B | F3 | MTA A-B | ||
| Würm II | 3-4 | MTA A | F4 | MTA A | ||
| Würm I | 2A-2C | Moust. | G | Moust. | ||
| Würm I | 2D | Moust. | H2-H1 | Typical | ||
| Würm I | 2E, 2F | Typical | I1-I2 | Typical | ||
| Würm I | 2G | Moust. | J1-J2 | Typical | ||
| Würm I | 2G Base | Moust. | J3 | Typical | ||
| Würm I | J3a-c | Asinipodian | ||||
| Würm I | 3 | Typical | éboulis | |||
| Würm I | 4A | Typical | X | Typical | ||
| Würm I | 4B | Denticulate | ||||
| Würm I | 4C | Typical | ||||
| Würm I | 4D-E | Typical | Y-Z | Typical | ||