The second season took place between the 22nd of March and the 22nd of April. The aims were focused in completing the study of the stratigraphic sequence with the minimum effect on its extension. We consider three groups of different diachronic moments: upper, intermediate and lower stratigraphic levels. The upper levels (I to V) with a density of 150 m, affect squares B3 and B4. The excavation of the intermediate levels (XIII-XV) with a width of 220 cm was displaced to the south (squares A3 and A2). The lower levels (XV-XVII) were excavated on squares C1, C1’, C2’ and C3’ looking for the normalization of the stratigraphic general cut. The same ended in a stalagmite basal layer and were affected partially by the old mining works. This excavation campaign generated stratigraphic modifications: level I was divided in Ia, Ib and Ic due to the individualization of these two clay levels and one breccia. Level XIII, is divided in XIIIa, XIIIb and XIIIc because of the existence of three levels with a variation of a fraction and compactation. On the lower levels, the falling moment of the blocks passed to be considered level XVI, underneath which XVII divided into XVIIa, XVIIb and XVIIc, corresponding to two clay levels and another one of platelets (b). For sampling, we extracted sedimentological materials of the lower levels and the pollen analysis which affected to the levels I to XIV.
View of the general sequential excavation. Working in intermediate levels
Working in the lower levels. Excavation team 1991