WOODWORTH: GEOLOGICAL EXPEDITION TO BRAZIL AND CHILE. 959 
228 ! Beatis 
do. 
do. with thin sandstone bands. 
BAO «eee. 
do. purple. 
Sandstones? 
ys | 
Red cut; bright red; terra roxa? 
yO 
do. 
Shales, purple, under red bed. 
Cherty layer, vesicular, from 1 to 1.5 inches thick; in shales near 
232. 
233. do. 
234. do. terra roxa? mixed with sand? 
235. do. 
236. do. near 
Purple shale (diabase sill above?). 
237-238. 
Red cut. 
Chert beds. 
Stratified purple shales; dip northwest. 
2 
Sandstones and purple shales, thick, interlaminated. 
240-241. 
Piracicaba Station. 
Without deep borings it: is hardly possible to obtain an accurate 
measurement of the thickness of the strata in this section from Itaicy 
to Piracicaba. Any estimate is increased a slight amount by the 
small overthrust faults, for which a deduction should be made, though 
in round numbers this is possibly a negligible quantity. There is also 
the question of the uniformity of the dip of the beds. The small 
contortions associated with the little faults demonstrate the existence 
of some Post-Permian disturbance of the beds, mainly an eastward 
overthrust. From kilometer post 189 to the cross-road between that 
post and 190 kilometers, there is a bed of greenish black shale which 
appears to overlie as in a shallow synclinal fold the glacial sandstones 
on the respectively south-east and north-west of the exposure. This 
point is 8.5 kilometers north-west down the supposed dip from the 
