. Bulletin - United States National Museum. Science. 242 BULLETIN 103. UNITED STATES NATIONAL MUSEUM. upward at such a rate that its top remains near the surface of the water and through retreat of the shore it is converted into a barrier. Continued subsidence, where the inclosed land area is an inland, may result in the production of an atoll circumscribing a lagoon without any land mass projecting above the water level. But this is not all. The Darwinian hypothesis involves more than mere. Fig. 4. Copy of Darwin's figure illustrating conversion of a fringing into a barrier reef according to
. Bulletin - United States National Museum. Science. 242 BULLETIN 103. UNITED STATES NATIONAL MUSEUM. upward at such a rate that its top remains near the surface of the water and through retreat of the shore it is converted into a barrier. Continued subsidence, where the inclosed land area is an inland, may result in the production of an atoll circumscribing a lagoon without any land mass projecting above the water level. But this is not all. The Darwinian hypothesis involves more than mere. Fig. 4. Copy of Darwin's figure illustrating conversion of a fringing into a barrier reef according to his hypothesis. a a —outer edge of the reef at the level of the sea. bb— Shores of the island. A 'A '—Outer edge of the reef, after its upward growth during a PERIOD OF SUBSIDENCE. CO— THE LAGOON-CHANNEL BETWEEN THE REEF AND THE SHORES OF THE NOW ENCIRCLED LAND. B'B'—THE SHORES OF THE ENCIRCLED ISLAND. N. B.—IN THIS, AND THE FOLLOWING CUT, THE SUBSIDENCE OF THE LAND COULD ONLY BE REPRESENTED BY AN APPARENT RISE IN THE LEVEL OF THE SEA. subsidence and the conversion of a fringing into a barrier reef. It also attempts to account for extensive submarine platforms by assuming that they have been built upon sloping basements through agencies dependent on the presence of reefs. (See text-figs. 4, 5, 6.) Dana's interpretation 1 is essentially that of Darwin. a"., *%__<?_' -41. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Size: 3224px × 775px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
