I860.] Geological Specimens from the Persian Gulf. 359 



Report on Geological Specimens from the Persian Gulf Sfc, collected 

 by Captain C. G. Constable, H. M. I. N. Concluding portion by 

 H. J. Cabtek, Esq., F. P. S. 



Since my Eeport on the Geological specimens brought to me by 

 Captain Constable from the Persian Gulf was published,* Captain 

 Constable and his assistant Lieutenant Strife have been back to the 

 Guff to finish their survey, and, having again returned to Bombay 

 with the necessary observations for completing their Chart, have, at 

 the same time, brought geological specimens from the islands which 

 they had not before visited. 



It will be remembered that the specimens first brought were chief- 

 ly from the islands at the entrance and on the Persian side of the 

 Guff. Those which I have now received are from the islands on the 

 Arabian side, and which, with Captain Constable's account of the 

 Artesian Springs about Bahreyn, and the occurrence of floating tracts 

 of Naphtha a little higher up, will now successively occupy our at- 

 tention. 



After having entered the Persian Gulf and keeping on the Arabian 

 side of the islands of Boo Moosa and Surree,f whose geology has 

 been mentioned in my last " Report," we come, bearing S. S. W., about 

 45 miles from the latter, to the island of Seir Abonade, rising 240 feet 

 above the level of the sea at its highest point, whose geology is illus- 

 trated by volcanic trappean rock and red ferruginous gypsum, similar 

 to that of the nearest island, viz. Surree, which thus connects Seir 

 Abonade with the volcanic formations of the whole of the islands on 

 the Persian side and extends these formations on to the islands on the 

 Arabian coast, with which we are now principally concerned. 



Taking thence a W. by S. course and running along the border of 

 the " Great Pearl Bank," which presents nowhere more than ten 

 fathoms of water over it, and shoals off to the Arabian coast, we 



* For the former portion vide Bengal Asiatic Journal, No. 97, p. 41. (New- 

 Series). 



f I must here follow the Orthography of the Charts. " Boo Moosa" and 

 " Surree" would certainly be better spelt " iiu Musa" and " Sarri" for European 

 pronunciation generally. 



