. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Fig. 24.— Section across the Serra do Espigao at the Collectoria on the road from Rio Negro to Lages. tilted beds at the bottom of the valley and the apparently lower level at which the trap lies south of the stream crossing demands a throw of the normal fault on the south side in a manner nowise supporting the hypothesis that the escarpment is due to a fault. This northerly steep dip has by some been regarded as cross-bedding and is stated to occur elsewhere along the trap escarpment in the underlying sandst
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. Fig. 24.— Section across the Serra do Espigao at the Collectoria on the road from Rio Negro to Lages. tilted beds at the bottom of the valley and the apparently lower level at which the trap lies south of the stream crossing demands a throw of the normal fault on the south side in a manner nowise supporting the hypothesis that the escarpment is due to a fault. This northerly steep dip has by some been regarded as cross-bedding and is stated to occur elsewhere along the trap escarpment in the underlying sandstones. Niiinher of the trap sheets.— It is stated that there are four trap sheets or sets of sheets in the trap mass of the Serra Esperan9a on the CO«rr<BA;^0S. Fig. 25.— Cross-section of the Trap plateau from the Rio Negro to Lages. 1 (dotted). Sao Ben to beds. Triassic. 2 (right lined). The Collectoria trap sheet. 3 (cross lined). The Corisco trap sheet. 4. The Third (and Fourth?) trap sheets. north of the valle\^ of the Rio Iguassii. In Dr. Derby's section the trap is diagrammatically represented as if composed of surface flows. The number of flows or sheets entering into the plateau between the Serra do Espigao and the sandstone area about Lages was not de- finitely determined by observation upon the ground but the plotting of the profile of the route and the outcrops of sandstones encountered in the trappean tract leads to the conviction that along this route there are at least three great sheets of trap separated by sandstone beds. The subjoined figure section (Fig. 25) gives the approximate profile and geological section along a line paralleling the road from. 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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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
