Sr 
En 
Pliocene 
DETRITIC FORMATIONS 95 
Overlapping the whole series: 
Coarse torrential conglomerate (Puna gravels). 
iUnconformity. Dislocations. 
Calchaqui-strata. Soft Sandstones, marls, conglomerates. 
Dislocations. 
Cretaceous Brown, red and redbrown sandstones. Crossing veins 
Jurassic 
Rhaetic 
Triassic | 
(Damuda) 
Permian 
of basic volcanics. 
Grayish and greenish sandstones and slates with coal 
seams and Thinnfeldia. Basic lava sills. 
{Pale brown sandstones (rhaetic too?). 
Red and upward brown sandstones (triassic too?) and 
conglomerate beds. Concordant sheets of amygdaloide 
and dense melaphyric rocks. Gypsiferous fissures in the 
sandstones. Suncracks and ripplemarks on the bedding 
planes. 
Hiatus of erosion. 
Grayish sandstones. Clayish slates alternating with sand- 
stone beds and containing plant remains (Neuropteri- 
dium). Coal seams. | 
(Karharbari) Grayish — yellowish sandstones with alternating slates. 
(Talchir) 
On the bedding planes of the sandstones Cruziana-like 
figures. 
Local hiatus of erosion. 
A graywacke-like rock with scattered small boulders. No 
Stratification (tillite). At the base a coarse conglome- 
rate bed. 
Great unconformity. 
Old palaeo- Basement of metamorphic schistose and eruptive-injec- 
ZOIC 
tion rocks. 
