72 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
which a conglomerate 1.80 meters thick is recorded as resting on the 
granite floor (White, loc. cit., p. 43). Eighteen kilometers south- 
ward from Xarqueadas in another boring the Orleans conglomerate is 
reported with large blocks of granite and with a thickness of 16.16 
meters, resting directly on the granite. 
In the exposures reported between Florianopolis and Lages and 
F Rio Brac a de Va 
Paine Jorteans oNortel apivavy 
Tubarao Kee ve 
ns 
MER samt ings 
Fia. 20.— Section of the Minas-Orleans basin. 
between Lages and Blumenau in Santa Catharina, there is described 
among the beds beneath the conglomerate horizon “a very hard fine 
grained grayish white whetstone grit” in layers eight to twenty 
centimeters in thickness. These layers it is also stated gave the name 
Navalha to the village on the Blumenau-Lages road near which 
locality they were once quarried for whetstones. Similar beds are 
likewise mentioned in the same report as resting with a few meters 
thickness on the granite near Suspiro in Rio Grande do Sul and also 
along the Rio Trombudo where crossed by the Blumenau-Lages road. 
Attention may here be called to the fine-grained compact white sili- 
ceous rock which underlies the boulder-beds on the right hand bank 
of the Jaguaricatu along the railroad between Sengéns and Sao Pedro 
de Itararé in northeastern Parana described on page 62; fragments 
of this rock appear to be abundantly distributed in the shales and 
sandstone of Sao Paulo often with glacial scratches. 
I have little more than details of structure and the conclusions 
based thereon to add to Dr. White’s account of the Permian con- 
glomerates of the Orleans basin. This basin (Fig. 21) is a down- 
faulted outlier of the Permian area. The boundary fault, on the 
western margin of the basin, brings the sediments against a basic dike 
whose shattered condition suggests that the faulting occurred after 
the intrusion of the dike. A short distance west of this broad dike 
is a narrow basic dike somewhat faulted within its mass. I observed 
two nearly vertical slickensided surfaces striking nearly northwest 
southeast on which the slickensides pitch to the southeast on the 
eastern fault at angles between twenty-five and thirty degrees and 
