WOODWORTH: GEOLOGICAL EXPEDITION TO BRAZIL AND CHILE. 25 
red soils are not so common on this Triassic area as on the north in 
Paran4 and Sao Paulo. The basalt has disappeared from a large tract 
about Lages without leaving any noticeable trace. 
At 9:25 a.M. we came to the Rio Canoas which is here a broad deep 
stream over which our pack-train was ferried on a platform supported 
by four dug-out canoes and held to its course by a wire cable. On the 
upland we passed the hamlet of Canoas with oxen ploughing. Shortly 
before noon we descended a steep slope to a stream crossing with red 
shales dipping north in the bank. Farther on the mule path trav- 
erses a dike about seventy-five feet wide cutting the sandstones. 
This dike is heavily charged with fragments of several rocks and min- 
erals evidently brought up from below. About a mile farther south 
a narrow dike about one foot wide occurs along the trail near a small 
stream. About a mile farther south there is a short low ridge on the 
east of the road with small conical spurs and buttresses of inclined 
beds on its north side. On approaching this point on the road with a 
slight rain falling thousands of winged ants flew over the campo up to 
fifteen feet in the air and for some reason chose to collect behind my 
head in great numbers. On catching up with the party I found the 
tent pitched in a clump of bushes at the western end of the ridge just 
as a steady rain set in for the night. 
The small lakelets so characteristic of the trap surface also occur 
in the sedimentaries south of the escarpment. Here the depressions 
appear to mark the site of springs. From the dike southward the dip 
is southerly and probably S.W. There is a ee anticlinal fold near 
this camp with axis NNW-SSE. 
August 27th.— It rained nearly all night and until 7 a.m. We 
rode southward across the bleak campo to a descent over sandstone 
beds which brought us, after a journey of fourteen days from Ponta 
Grossa, into a broad irregular valley in which Lages lies. 
August 28th. The light brown Triassic sandstone under a red 
shale bed north of Lages is quarried for building stone and flagstones. 
No fossils other than wandering trails were to be seen in the sandstone. 
Certain greenish shale beds pass laterally and obliquely to the stratifi- 
cation into red beds, and well-defined green-walled joints in the red 
beds show that the green color is locally a post-depositional alteration 
of the deposits. In the afternoon we returned northward, to the 
locality of the dike bearing inclusions, for a more detailed study of 
that rock. 
Ant-hills about fifteen inches high bestrewed the surface of the 
Triassic sedimentary tract. As usual most of the hills had been 
