PLATE If, 
Fig. 1. Amphibolite of granoblastic, recrystallized structure. From a breccia frag- 
ment in granite. Nic. 7. Magn. 88 X. Cerro La Vatea, opposite Villa Castelli. 
Fig. 2. Biotite transformed to fibrolite (sillimanite). Syntectic rock, surrounded by 
granite. Nic. +. Magn. 88 X. Cerro La Vatea. 
