286 



PEOCEEMNGS OF THE GEOLOGICAL SOCIETY. [Apr. O, 



Fig-. 1. — Map of tlie Island of Eigg. 



Pitchstone-porphyry couJee of the Scur. R. Outcrop of ancient river-gravel 

 under pitchstone of Sciir. P. Small veins of pitchstone. h. Dykes, veins, 

 and intrusive sheets of basalt-rocks. The short black lines traversing the 

 map in a N.W.-S.E. direction are basalt dykes. /. Intrusive quartziferous 

 porphyry. D. Bedded basalt rocks with occasional tuffs. F. Bedded por- 

 phyrite. 



4. Clay with Ammonifes, Belemnites, &c. 



3. Shales and Limestone bands with C^prids, Ci/clas, Osfrea, &c. 

 2. Thick white and yellow Sandstones with plants. 

 Oqq I 1. Shales and Limestone bands with Cyj'jrids, Cyclas, Mi/filiis, and teeth 



V and bones of Reptiles. 



X X. Loch Beinn Tighe. x . Loch a Bhealaich. 



— > ■ General dip of the rocks. 



