woodworth: geological expeditiox to brazil and chile. (31 



minimum estimate 



1 1 1 1 1 1 II 



7 



D 

 S 



The shales at EHas Fausto Station, by the 

 fifteen feet, by the maximum twenty-two. 



The succeeding group composed mainly of sandstones including all 

 the beds about Capivarv, by the minimum estimate 

 based on the hypothesis of duplication of exposure 

 through gentle folding 600 feet, or by the maximum 

 1,400 feet. 



From the top of these beds to the shales with 

 Stereosternum at Piracicaba 700 feet by the minimum, 

 1,000 feet by the maximum method. 



These minimum estimates give a thickness of 2,343 

 feet, or about 714 meters. 



The Bofete-well record in Sao Paulo cited by Dr. 

 I. C. White gave forty-eight M. for the Iraty Black 

 shale and 837 feet below that group to the bottom of 

 the well. 



The accompanying section (Fig. 12) represents the 

 succession of strata between Itaicy and Piracicaba 

 interpreted on the probable solution that the shales 

 east of the Rio das Pedras are in a synclinal outlier 

 of the beds about Piracicaba. 



In this section there appears no bed equivalent 

 in lithological character to the boulder tillites of the 

 Jaguaricatu section in northern Parana. In the 

 section along the line of the railway there are scattered 

 stones and small blocks embedded indifferently in the 

 peculiar sandstones and shales. This 

 indiscriminate distribution of fre- 

 quently striated stones in beds of 

 sandstone and shale is presumptive 

 evidence of the action of floating ice 

 particularly in the case of the shales. 

 The weathered state of the sandstones 

 in the railway cuts makes precise 

 comparisons with the deep' blue 

 tillite beds farther south difficult and 

 unsatisfactory. 



So far in this section of the Permian no marine fossils have been 

 found below the Stereosternum beds if indeed that horizon be marine. 

 On the contrary, notwithstanding the trunks of trees discovered by 

 Dr. Derby somewhere near the middle of the section, no fossils appear 





Fig 12 — Section of Permian from 

 granite floor at Itaicy to Pira- 

 cicaba. 1. Pre-Devonian granite. 

 2. Sandy tillite about Imbaiatiiba. 

 .3. Sliales. 4. Sandy tillite. 5. 

 Stiales at Estacao Elias Fausto. 

 6. Sandy tillite east and west of 

 Capivary. 7. Shales west of Rio 

 das Pedras. C Cherty layers. 

 8. Shales and Stereosternum beds 

 about Piracicaba. D. Diabase sills. 



