. Boston journal of natural history. Natural history. 88 Couthouy on Coral Formations SECTION OF A RAVINE CLOSED AT BOTH EXTREMITIES, IN ONE OF THE VALLIES RUNNING FROM THE COAST TO THE BASE OF WARITIVA, IN Co a. a. a. Lonejitudinal section of the ravine. b. b. Steep lateral ridge, rising to a height of two thousand feet. The mountains in outline, are from five lo eight thousand feet high. It is difficult, satisfactorily, to account for these singular chasms. That at Waihiria may indeed have been produced by a landslip blocking up the valley, but the one last men- tioned would rather
. Boston journal of natural history. Natural history. 88 Couthouy on Coral Formations SECTION OF A RAVINE CLOSED AT BOTH EXTREMITIES, IN ONE OF THE VALLIES RUNNING FROM THE COAST TO THE BASE OF WARITIVA, IN Co a. a. a. Lonejitudinal section of the ravine. b. b. Steep lateral ridge, rising to a height of two thousand feet. The mountains in outline, are from five lo eight thousand feet high. It is difficult, satisfactorily, to account for these singular chasms. That at Waihiria may indeed have been produced by a landslip blocking up the valley, but the one last men- tioned would rather appear, were it not for the perpendicular- ity of its terminal walls, to have arisen from a confluence of the two great lava streams forming the lateral ridges, as the rocks are on all sides in a normal position and of uniform structure. Or they may be owing to a sudden sinking in of the crust at the time when the subterranean fires were in ac- tivity. Pits, very similar to them, but of less extent, are of quite frequent occurrence on the black ledge of lava surround- ing the crater of Kilauea. The second class of ravines may, I think, generally be referred to ancient craters, one side of which has been rent apart by earthquakes. In their situa- tions and outline, in the uniform perpendicularity of their parietesj and the sub-columnar structure of the lava compo- sing them, they correspond exactly to the craters of the table land of Mauna Loa. In fact, not many years ago, during a sharp earthquake, a similar outlet, since fiUtjd up near its com- mencement by subsequent overflowings of the lava, was produced on the S. W. side of the great crater of Kilauea or. 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 Boston Society of Natural History. [Boston, Boston Society of Natural History]
Size: 2197px × 1138px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublisherbostonbostonsocietyofna, booksubjectnaturalhistory
