. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 17.— Section of Permian shales, boukler-beds. and sandstones at Rio Nea:ro. The section, at the bridge (Fig. 17) above referred to, displays sandstones at water-level somewhat cross-bedded and carrying scattered pebbles and small blocks. I measured one granitic frag- ment 16 inches long. On the south side of the Rio Negro along the road going eastward towards Sao Bento yellow^ tillite beds with intercalated dark shales contain many granitic boulders. A cobble eight inches in diameter showed good striation. The bo
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 17.— Section of Permian shales, boukler-beds. and sandstones at Rio Nea:ro. The section, at the bridge (Fig. 17) above referred to, displays sandstones at water-level somewhat cross-bedded and carrying scattered pebbles and small blocks. I measured one granitic frag- ment 16 inches long. On the south side of the Rio Negro along the road going eastward towards Sao Bento yellow^ tillite beds with intercalated dark shales contain many granitic boulders. A cobble eight inches in diameter showed good striation. The boulders range from two to three feet. Fig. is.— Section of fossiliferous Permian marine shales between boulder- beds near Rio Negro. in diameter, all in the yellow sandy tillite, with \ery few small pebbles, arguing for floating ice. A few kilometers along this road eastward from the bridge where a small stream has cut a well-defined valley in its descent to the Rio Negro, Dr. Oliveira found a marine fauna in black shales intercalated betMeen two boulder-beds of the tillite series (Fig. 18). I refer to this bed and its apparent significance elsewhere. A few kilometers farther east by south along this road a new cut near the small Rio da Vida nova displayed the shales and tillite beds (Plates 23 anfl 24), at horizons closely corresponding to the beds above. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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