168 GEOLOGY. 



Munroe, H. S. The Gold Fields of Yesso. Geological Survey of 

 Hokkaido. 80 pp. ToJcio, Japan. 



Eenaud, Or. P. A. Yerslag van de Kohlenmijn Oranje-Nassau te 

 Pengaron, in de zuider- en ooster-afdeeling van Borneo. [Coal 

 Mines of Orange-Nassau at Pengaron, S.E. Borneo.] Jaarh, 

 Mijn. Ned. O.-Ind. ii. pp. 85-117 ; 3 plates. 

 Thomson, Prof. W. Eeport to the Hydrographer of the Admiralty 

 on the Cruise of H.M.S. ' Challenger ' from June to August, 

 1875. Proc. R. Soc. vol. xxiv. p. 33 ; 5 plates. 

 Contains geological items. 

 Velain, C. Les iles Saint-Paul et Amsterdam. [St. Paul and 



Amsterdam Islands.] Rev. Sci. p. 121. 

 Describes their geological and physical features. 

 Verbeek, R. D. M. Geologische Beschrijving der Distrikten Eiam- 

 Kiwa en Kanan in de zuider- en ooster-afdeeling van Borneo ; 

 volgens opneming in de Jaren 1869 en 1870. [Geological 

 Description of the Districts of Riam-Kiwa and Kanan in the S. 

 and E. parts of Borneo.] Jaarh. Mijn. Ned. Oost-Ind. Jaarg. 4, 

 Deel i. pp. 1-130 ; chromo-lith. maps, 2 plates, 15 woodcuts. 

 In addition to geological observations, the author gives petrological 

 descriptions of numerous rocks, aud in chapter 7 describes the occur- 

 rence of certain minerals in the alluvial deposits. These consist 

 of diamonds, platinum, gold, and chrome iron-ore. The largest 

 diamond found of late years in Borneo was met with at Tjempaka in 

 1868, and weighed 25 carats. Analyses of platinum ore are given. 

 The Borneo mineral Laurite has not been found in the platinum sands 

 of Tjempaka. P. W. E. 



. De Nummulieten mit den Eocenen Kalksteen van Borneo, 



mit twee platen. [Nummulites in the Eocene Limestone of 

 Borneo.] Jaarh. Mijn. Ned. O.-Ind. t. ii. pp. 133-161 ; one 

 plate of Geological Sections and one of Fossils. 



. XJeber die Gliederung der Eocanformation auf der Insel 



Borneo. [Eocene of Borneo,] Paleontographica, Suppl. iii. Lief. 1, 

 pp. 3-9 ; woodcut. 

 Introductory to Dr. Bottger's memoir (see jf)ost). The coal-bearing 

 strata of Borneo are Eocene, and contain Nummulites abundantly in 

 the Upper Calcareous division : greatest thickness 1500 ft. : the coals 

 are in the lower division, argillaceous group ; 5 are workable, having a 

 combined thickness of 24 ft. E. B. T. 



On the Geology of Central Sumatra. Geol. Mag. dec. 2, 



vol. ii. pp. 477-486 ; 3 woodcuts (map and 2 sections). Errata 



in vol. iii. p. 382. 

 The oldest rocks are granites and syenites. On these are Carboni- 

 ferous or Permian rocks. The next sedimentary rocks are Tertiary ; 

 these are classed into 4 groups, in one of which coal is found. 

 Quartz-porphyries and greenstone are pre-Tertiary. Trachytes are 



