By O.A. Jones (Eds.)
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It is, however, probable that these glacial shifts were superimposed on a general Pleistocene regression from an early Pleistocene (Calabrian) level 180 m above the present level. If this is so, early Pleistocene glacial regressions could still have been well above present sea level, and the relationship between sea levels and Daly's platforms assumes a new complexity. Suggestions made by Johns (1934) and Shepard (1948) that Pleistocene sea-level falls may have been as great as 1-2 km are not now taken seriously.
These steep slopes have been shown to extend to depths of some hundreds of meters in some cases, well below the limit of Pleistocene sea-level fluctuations (Kuenen, 1933, 1938), and to contrast with the mean slope of about 10° exhibited by constructional volcanic islands (Menard, 1969). It has also been shown that the deeper slopes of reef-crowned islands correspond in form with the slopes of reefless volcanic islands (Robertson and Kibblewhite, 1966). C. SUBSIDENCE AND REEF TYPES Darwin's recognition of the three main stages in his developmental sequence corresponding to fringing, barrier, and atoll reefs did not exhaust the theoretical range of possible reef types (Darwin, 1842, pp.
1954). Geology of Bikini and nearby atolls. , Geol. , Prof. Pap. 260-A, Foreword, i-vii. Ruhen, O. (1963). " Little, Brown, Boston, Massachusetts. Schott, G. (1935). " C. Boysen, Hamburg. Squires, D. F. (1962). Corals at the mouth of the Rewa River, Viti Levu, Fiji. Nature (London) 195, 361-362. Stanley, D. , and Swift, D. J. P. (1967). Bermuda's southern aeolianite reef tract. Science 157, 677-681. Stoddart, D. R. (1965). The shape of atolls. Mar. Geol. 3, 369-383. Stoddart, D. R. (1969). Ecology and morphology of Recent coral reefs.
Biology and Geology of Coral Reefs. Geology 2 by O.A. Jones (Eds.)