OCEANIA. 169 



Middle or late Tertiarj' ; and this seems to be the case also in Java and 

 Borneo. There is a short description of the Island of Nias, and a list 

 of papers on the Geology of Sumatra. W. T. 



Vidal, Dr. A. Voyage de Yeddo k Niigata. [From Yeddo to 

 Niigata.] Mem. Soc. Sci. Phys. Nat. Toulouse, t. i. 55 pp. 



Wichmann, Dr. A. Zur geologischen Kenntniss der Palau-Inseln. 

 [Contribution to the Geological Knowledge of the Pelew Islands.] 

 Joui-n. Mus. Godeffroy, Heft viii. pp. 123-127 ; N. Jahrh. p. 656. 



Kubary has distinguished two divisions in these islands, the N. group 

 being composed of Tertiary or post-Tertiary eruptive rocks, and the 

 S. of Corals. The eruptive rock resembles basalt, being composed of 

 a brown glassy matrix with crystals of augite, plagioclase, and sani- 

 dine. The author calls the rock augite-andesite, and gives two 

 figures of microscopic slices. Andesite-tuiFs, associated with the 

 eruptive rocks, are described. Over the tuffs lie ferruginous clays. On 

 the E. side of the Island of Baobeltaob is a stratified zoogenous breccia 

 mostly composed of marine animal remains, foraminifera, and bivalve 

 shells, underlain by another stratified deposit containing rounded 

 granules of quartz and felspar. Gravels on the beach indicate the 

 presence on some neighbouring sea-bottom of a syenite-granite. The 

 coralline-limestone series which forms Kubary's second division is 

 filled with species of the following genera — Tridacna, Strombus, 

 Mactra^ Cyprina, Liicina, Tellina, Venus, Spondylus, Madrepora, Ser^ 

 pul<i, Balanus, Fistulana. The depression which has already been 

 proved in the case of a large number of the Pacific Islands is corroborated 

 in the Pelew Islands by the fringing reefs which enclose almost all 

 the islands, and the barrier-reef surrounding the group. R. L. J. 



See also: — 



Clarke, Rev. W. B. Sedimentary Formations, N. S. Wales. (Notes 

 on New Caledonia) : p. 148. 



Dana, Prof. J. D. Corals and Coral Islands : post, under Physical 

 Geology. 



Verbeek, R. D. M., and Dr. 0. Bottger. Eocene, Borneo : post, 

 under Invertebrata. 



