. Geological magazine . vol. xxxi,1888, p. Ixxv) the island has been a land area since the Permo-Carboniferous, and an island certainly from Tertiary times. * Sauer, Ueber Riebeckit, ein neues Glied der Hornbleudegruppe : Zeit dentgeol. Ges., vol. xl (1888), pp. 138-146. 5 C. A. Raisin, Rock Specimens from Socotra : Geol. Mag., Dec. Ill, Vol Y(1888), pp. 504-7. DECADE IV. VOL. VI.—NO. XII. 34 530 Dr. J. W. Gregory—Geology of Socotra, etc. During last winter Socotra and the neighbouring island of Abd-el-Kuri were visited hy Dr. H. 0. Forbes and Mr. Ogilvie Grant, whomade a collection of rocks,
. Geological magazine . vol. xxxi,1888, p. Ixxv) the island has been a land area since the Permo-Carboniferous, and an island certainly from Tertiary times. * Sauer, Ueber Riebeckit, ein neues Glied der Hornbleudegruppe : Zeit dentgeol. Ges., vol. xl (1888), pp. 138-146. 5 C. A. Raisin, Rock Specimens from Socotra : Geol. Mag., Dec. Ill, Vol Y(1888), pp. 504-7. DECADE IV. VOL. VI.—NO. XII. 34 530 Dr. J. W. Gregory—Geology of Socotra, etc. During last winter Socotra and the neighbouring island of Abd-el-Kuri were visited hy Dr. H. 0. Forbes and Mr. Ogilvie Grant, whomade a collection of rocks, upon wliich I have been asked to Forbes has given me an account of the mode of occurrence anddistribution of the principal rocks. At about the same time bothislands were visited by the Austrian South Arabian Expedition inthe Gottfried, and a note on their geology has been published byDr. F. Kossmat, in which he remarks the occurrence of Cenomanianand Eocene limestones.^ Jfas Hatclaf NORTH. Hadibo or Tamri. SOUTH. Limestone Series Felsile ^ Basalt:Dukes Geological Sketch Map of North-Central Socotra. Archearv Series& Grcxnite The present collection does not necessitate any modification in thegeological history of Socotra, as deciphered by Professor Bonneyfrom the materials available in 1883. But the collection adds to theknowledge of the distribution of the different rocks in the island. 1. SOCOTKA. The rock collection from Socotra contains representatives of threegroups of rocks—a basal Archean series, some massive limestones,and some comparatively recent volcanic rocks. The largest part of the collection consists of Archean rooks andsome associated granites. As a rule the gneiss is more granitoid 1 F. Kossmat: Sitz. math. nat. CI. k. Akad. Wiss. Wien, 1899, No. ix, pp. 73-82. J)r. J. W. Gregory—Geology of Socotm, etc. 531 •than the rock which forms the main mass of the East AfricanArchean plateau ; but a specimen from Thlutid, at the height of900
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