14 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
conglomerates such as constitute the tillite beds. ‘Some of the coarse 
gritty beds contained clay particles. In all probability these were 
once grains of feldspar indicating that the unaltered rock was a 
granitic sandstone related to arkose. Dikes or sills of basic intrusives. 
occasionally intersect the sandstone along this route. 
July 28th— Through the courtesy of Dr. Cruz Lima we travelled 
in a special car from Itararé to Jaguariahyva, stopping in the newly 
opened railway cuts to examine the tillite beds. At the first stop in 
a cut above the Rio Jaguaricatu in Parané a well-striated pebble was 
found in a boulder-bed, establishing at once the identity of origin 
of these deposits with those of India and South Africa. 
July 29th— Continued the journey by rail to Ponta Grossa, the 
headquarters of the party engaged in the geological survey of Parana. 
The railway from Jaguariahyva to Ponta Grossa crosses the 
Devonian sandstone cuesta affording a magnificent view of the 
country. 
Between Pirahy and Coxambii the Pre-Devonian rocks, exposed 
in a lowland widened out along the course of the Rio Yapo, comprise 
a tilted group of rocks of which I have seen no account in the descrip- 
tions of the metamorphosed district of the Serra do Mar. At Pirahy 
Station there is a monoclinal set of beds in a ridge west of the railroad. 
The beds strike north by east and dip about 30° west. About a 
mile south of Pirahy at a water-tank a felsitic breccia crops out. 
Farther south the train passes through a cut in which slightly meta- 
morphosed shales, sandstones, and a pebble bed with fragments of 
red felsite, granite, etc., appear, having a reddish color and dipping 
westward at an angle of about 30 degrees. These rocks from their 
relatively unmetamorphosed condition appear to be younger than the 
belt of slates and limestones described as occurring in Sao Paulo. 
No fossils were seen in the section nor did time permit a satisfactory 
search for further details of the stratigraphy. This formation, so 
different from the members of the Pre-Devonian terrane on the east, 
is the most western member of the highly inclined rocks seen in Parana 
and suggests that some horizon between the Middle Devonian and the 
slate and limestone terrane may yet be worked out and correlated 
in this field. 
Several days were spent at Ponta Grossa in the examination of the 
surrounding country, including a visit to Conchas where a bed of | 
tillite is to be seen. In the Carboniferous sandstones west of Ponta 
Grossa I found some worm burrows of the type known as Monocra- 
terion; these show a cup-shaped superior termination and a vertical 
