woodworth: geological expedition to brazil and chile. 59 



228 



do. 



do. with thin sandstone bands. 

 229 



do. purple. 



Sandstones? 

 230 



Red cut; bright red; terra roxaf 

 231 



do. 



Shales, purple, under red bed. 



Cherty layer, vesicular, from 1 to 1.5 inches thick; in shales near 

 232 ^ 



Red bed. 



233. do. 



234. do. terra roxaf mLxed with sand? 



235. do. 



236. do. near 



Purple shale (diabase sill above?). 

 237-238. 



Red cut. 



Chert beds. 



Stratified purple shales; dip northwest. 

 239 



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 



