DALY. 



206 



P. Hambruch, "Nauru" in Ergebnisse der Sudsee-Expedition 1908-1910 



R THiU BulY MurComp'^ziol! Vol. 34, 1899, p. 100 and p. 188; ibid.. 



' Vol. 16, 1895, p. 243. .. , .„ .om in- 



A. J. Jukes-Brown, Quart. Jour. Geo! Soc Vol. 4, , 1891, p. 19/ . 

 J.J.Lister.Quart.Jour.Geol.Soc. Vol.47,1891 p.590. 

 P. Marshall, Trans. New Zealand Ii^.«tit^te, Vol. 42 1909 p_333, Proc 



Australian Assoc. Adv. Science, Vol 12, 1909, p. ^6Z. 

 D Mawson, Proc. Linn. Soc. New South Wales, 1905, p. 400. 

 G." a! f! Molengraaff, Proc. Kon. Akad. van Weten., Amsterdam, 1912, p. 224. 

 R. Parkinson, Dreissig Jahre in der Siidsee, Stuttgart, 1907^ 

 E R6clus, Nouvelle Geographic Universelle, Pans, Vol. 14, 1889. 

 F: R. C. Reed, Geol. Mag., Vol. 10, 1903 p. 298. . iqio n 54- Verhand 



K. Sapper, Mitt. a. d. deut. Schiitzgebieten Erg. Heft 3 1910 p. 54, Verhand. 

 ^^ XVII Geographentages zu Lubeck 1909- ^^^^l"}' I^IO- P- 1^3. 



G. Schmiele, Mitt. a. d. deut. Schiitzgebieten Vol. 4, 1891, p. 100. 

 r Semner Zeit fur Wiss. Zoologie, Vol. 13, 18bd, p. oob. , ^ ^ r -i 



a! VoTzkow, wSsen. Ergebnifse der Reisen in Madagascar undOstafrJ^a 

 in den Jahren 1889-95, Frankfurt a. M., Vol. 2, 1901, p. &iu. 



The table is far from being complete but the writer believes it to 

 illustrate the general situation. Where comparatively recent uplift 

 has occurred, the island either has no encircling submarine shelf 

 (Nos. 12, 13, 15, 17, 20-22, 24-20, 36, 37, 42, 45, 47, 54, 55, 63, 65-68 

 71 72 and 74. See Figs. 25-27 and 31) ; or has a shelf at a depth 

 less than that of a shelf encircling an undisturbed island, by an amount 

 roughly equal to the local uplift (Nos. 14, 16, 18, 19, 23, 28, 29 31, 32, 

 38 58, 59, 61 , 73, 75, and 76) . For apparently all but one of the cases 

 so far reported, the depths of the central hollows in recently uplifted 

 atolls are less than 40 m.; the single exception is Santa Anna island 

 in the Solomon group, where the depth may be as much as 90 m. 



Specially instructive are the regions where the sea bottom has been 

 differentially upwarped. From the work of E. C. Andrews, A. Agassiz, 



Sections illustrating a fringing reef , uplifted islands and a barrier r^^^^^^ 

 -pjrTTRv '?8 Rodrieuez is and, Indian ocean, w^ith a typical tnngmg reei 



(FR) and a broad!^reeless platform offshore. This island appears not to have 



been affected by crustal movement m the Recent period 



FmuRE 29. Vavau cluster Tonga group, an ^^P^^^^f ^^ J L^^^^^^^^ 



limestone plateau, which has been greatly eroded. Note depth ot plattorm 



'\\'guke m' Uvea, a tilted atoll of the Loyalty group. The varying depth 

 of the laeoon is a function of the differential uplift. 



Figure 31 Christmas island, Indian ocean, a strongly uphfted composite 

 of Tertfary Lestone and volcaAic rocks. Note the absence of a submarine 



^^FiGURE 32. Mbengha island, Fiji group, a typical barrier reef, little or not 

 at aU disturbed by Recent crustal movement. nor^tl. in fathoms 



Uniform scales; vertical scale 7 times the horizontal. Depth m fathoms. 

 Water shown in black; rocks are lined. 



