CRYSTALLINE BASEMENT 31 
“cluded palaeozoic schists (see fig. 5.) The approximative actual 
: 
N 
i west the body is bordered by the Umango schist area; to the 
| north it extends far into the mountains surrounding the valley of 
3 
Pe Te ee ee 
extension of the batholith in the surface is, as follows: to the 
- Fiambala, in the province of Catamarca, a fact proved by Penck 
(1915) but shown already on the map by Brackebusch (1891). To 
the east the granite body reaches probably to the western foot of 
the Sierra de Velazco, although, according to the map by Bracke- 
busch, there seem to be outcrops of parts of the gneissic rocks 
already in the valley hills of Chilecito. According to the map of 
- Bodenbender (1901) the granite extends far in the southerly di- 
~ rection. 
Completely surrounded by this granite lies, as the map (see fig. 5) 
_ shows, a complex of metamorphic schists, mica schists, quartz schists 
and amphibolitic schists etc. The sedimentary components are in some 
\ parts but slightly metamorphosed and do carry fossils here (Kayser 
_ 1876). The whole complex is therefore considered by Bodenbender 
(1916) of cambrosilurian age. Besides these fossiliferous parts of 
_the mass of schists, one generally meets a strong metamorphism, 
attaining its maximum on the western foot of the mountain, where 
mingled and resorbed rocks lie in a mass of pure granite. At the 
western wall of the Vinchina valley the plutonic metamorphism is 
of a similar intensity as in the Umango schist complex. These 
_ phenomena will be treated of in a following chapter. 
- Generally the geological appearance of the Famatina intrusive 
body has an abyssal habit, exposing irregularily contact lines as 
a result of a mingling and intense injection of apophyses. Simi- 
lar deep seated granitic cores now exposed by the erosion occur 
in many parts of the pampean sierras-areas. Already on the map 
of Brackebusch (1891) a greater part of these granites are mar- 
_ked with ,rocas eruptivas antiguas‘. It cannot yet be stated, if 
they are all of nearly the same age, but in many cases a lower 
palaeozoic age has been presumed. In the Sierra del Aconquija 
