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Dr. J. IF. Gregory — Geology of Somali -land. 



or from the Golis "Range, on the northern e<lge of the plateau. 

 The general physical geology of the country has been well described 

 by Captain Swayne. 1 



II. List of the Collections. 

 Mrs. Lort-Phillips' collection consists of a series of rocks and 

 fossils., of which the following is the list : — 



Fossils. 2 

 JBelemnites subhastatus, Zieten 



Parallelodon Egertonianus, Stoliczka 



Rhynchonella Edwardsi, Chapuis and Dewalque ... 



Rhynchonella subtetrahedra, Davidson 



Coral (gen. et sp. indet ) ... ... 



Cri/ptocmnia Lort-Phillipsim, n.sp..,. 



Rocks. 



1. Sedimentary. 

 Compact, hard, light-grey limestone 



Quartzose, coarse-grained, red hasniatite, passing 

 into a loose, coarse grit, stained by haematite. 



Purple, roughly-bedded, quartzose grit 



Hard nodules of brown hseniatite ; sometimes show 

 crystalline form; they generally show structure, 

 and are apparently concretionary in origin 



Locality. 



Bihin, in river-bed, 15 miles 



from Berbera. 

 Do. 

 Do. 



Do. 



Fara-Daro. 



Duba. 



Duba, eight 

 Berbera. 



miles from 



Loc. ? No doubt from sum- 

 mit of plateau. 



Daar-Ass, Golis Range. 

 Alt. 5000 ft. 



From summit of plateau ; 

 weathered out of sands. 



Summit of plateau. 

 Do. 



Golis Range. 

 Do. 



Chert ; sometimes chalcedonic, sometimes trans- 

 parent, and at others opaque, milky- white 

 Jasper concretions 



2. Igneous. 



Coarse, quartzo-orthoclase pegmatite 



Thin-bedded, very quartzose muscovite - biotite 



gneiss 

 Pebbles of hornblendic gneiss, with numerous veins 



and crystals of epidote. 3 



Miss Edith Cole's collection contains similar rocks, including 

 pegmatite, chalcedonic chert, haematite nodules, calcareous tufa, 

 wind-polished limestone from Bihin, and some fragments of roughly- 

 chipped chert flakes. 



Mr. Aylmer's specimens contain much the same, with several 

 interesting additions. There is a large specimen of very coarse 

 pegmatite from the face of the Golis, which contains large flesh- 

 coloured crystals of orthoclase, broad tabular crystals of muscovite, 

 aggregates of red garnets, and some long acicular crystals of apatite. 



1 H. G. C. Swayne, " Seventeen Trips through Somali-land," 1895, pp. 361-7. 



~ The Belemnite, the Lamellibranch, and the two Brachiopods have been 

 determined respectively by Messrs. G. C. Crick, R. B. Newton, and F. A. Bather. 

 Notes by Mr. Newton and Mr. Crick are published herewith, and a selection of the 

 specimens has been presented by Mrs. Lort-Phillips to the Geological Department of 

 the British Museum (Natural History). 



3 To determine the character of the mineral in this rock, as it throws light on the 

 nature of some rocks collected by Dr. Donaldson Smith much further to the south, 

 Mr. L. J. Spencer has kindly measured one of the crystals, and has determined them 

 as epidote. 



