. Bulletin of the Geological Society of America. Geology. REEFS AROUND DEEPLY ERODED ISLANDS 535 half a mile across, is so fore- shortened as not to be vis- ible between the barrier reef and the shore, both of which are shown by the same sea- level line. In Earotonga, a lofty member of the Cook group, drawn in the lower part of figure 12, the shore lowland consists of a slightly elevated reef, which would have been completely smoth- ered by detritus if the deep valleys had not been eroded and the island partly sub- merged before the reef be- gan to grow. The transfor- mation of Fauro, figure 1
. Bulletin of the Geological Society of America. Geology. REEFS AROUND DEEPLY ERODED ISLANDS 535 half a mile across, is so fore- shortened as not to be vis- ible between the barrier reef and the shore, both of which are shown by the same sea- level line. In Earotonga, a lofty member of the Cook group, drawn in the lower part of figure 12, the shore lowland consists of a slightly elevated reef, which would have been completely smoth- ered by detritus if the deep valleys had not been eroded and the island partly sub- merged before the reef be- gan to grow. The transfor- mation of Fauro, figure 11, in the Solomon group, from the initial form of a vol- canic cone or group of cones into the present "wreck^^ of branching ridges surmount- ing a submerged platform, 40 fathoms or more in depth, is utterly impossible by any combination of ero- sion and abrasion, without the aid of recent subsidence. Any incipient reefs that may have been formed around the shores of these islands before the erosion of their valleys must have been soon overwhelmed by outwash detritus; cliff-cut- ting must have thereupon set in, and thereafter the excess of detritus delivered XL—Bull. Geol. Soc. Vol. 29, 1917. 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 Geological Society of America. [New York : The Society]
Size: 910px × 2746px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
