Many "open Air" sites appear to have suffered from Frost Creep from occupation zones that were on chalk escarpments. For MSA (cerca 50 ka) sites not subjected to glaciation, there can be vestiges of the original sites still visible on a Google Earth survey. I tested 2 such sites (France and the UK) and found lithics at these locations.
Se hay alguno interese, puedo colaborar en el pre-análisis de las imágenes. Como brasileño, hablo el portunhol pero lego en español.
Sds Cordiales
Alan Cannell
Curitiba ISIPU