90 SIERRA DE UMANGO 
4. Sierra de Safiogasta (Cuesta de Miranda). 
5. Sierra de Velazco (Saladillo). 
6. Sierra del Vilgo (Amanao). 
7. Sierra de los Llanos. (Nacate, Malanzan, etc.). 
According to the plant remains from several of these occurrences 
(Kurtz and Bodenbender) they belong to the Karharbari hori- 
zon of India or to the Ecca series of South Africa. The specimens 
belong to a typical Glossopteris flora (lower permian). Under the 
coal bearing sandstones lies, as said, in many parts a boulder bed 
of basal character, noted already by Bodenbender (1896) in the 
Fig. 14. The tillite occurrence at the Agua Blanquita. Small circles signs: tillite. 
To the right in the background sandstones of the lower Gondwana. The white 
part to the left is the crystalline basement. Looking east. 
Sierra de los Llanos, and since encountered in most of the above 
enumerated localities. The conglomerates are not yet more closely 
studied, therefore but little is known about their lithological charac- 
ter. Keidel is, however, of the opinion, that they are all of a 
glacial origin as the conglomerate of permian age more closely 
examined by him in the profile of Jachal in the Precordillera of 
San Juan (Keidel 1914). Probably they all correspond to the 
lower permian glaciation and are of the same age as the Talchir 
in India and the Dwyka conglomerate in South Africa. As found 
above the conglomerate and the graywacke outcropping in the pro- 
file of the Cerro Guandacol show a glacial (tillite) character too. 
Similar rocks also do occur in the Famatina mountain. 
