Reports and Proceedings. 377 



coral bed, but was of inconsiderable tbickness. The tbird was 

 found among tbe uppermost Eagstones capping Cleeve, Leckbampton, 

 Painswick, Stincbcombe, and Dursley bills. In tbe Great Oolite tbere 

 was a coral-bed about tbe borizon of tbe Forest Marble, near Fair- 

 ford ; tbe Oxford Clay was witbout sucb structures, but in tbe Coral 

 Eag and CoralKne Oolite, coral-beds were again found. Steeple 

 Asbton, in Wiltsbire, bad been long famous for its coral-banks, and 

 in tbe Coralline Oolite, near Scarborougb, tbere was a very 

 considerable development of a coral-bed, some of tbe best road ma- 

 terial in tbat region being obtained from tbe crystalline limestone 

 raised out of tbe old coral-bank of tbe Oolitic sea. Tbe Kimmeridge 

 Clay, like tbe Oxford Clay, was devoid of coralline structures, but in 

 tbe Portland Oolite anotber coral-bank was found at Tisbury, in 

 Wiltsbire. One fact wortby of note is tbis, tbat tbe species of corals 

 found in aU tbese different beds are quite distinct specifically from 

 eacb otber, every period of time bavin g bad different forms of arcbi- 

 tects in building tbese structures in tbe ancient seas, and all of tbem 

 generically distinct from tbose wbicb exist at tbe present period. 

 Tbe great lapse of time wbicb our present modern reefs and islands 

 represented was next pointed out, for it could easily be demonstrated 

 tbat as tbe coral-polypes raise tbeir structure very slowly, a long period 

 of time was required to build up a structure like tbe barrier reef of 

 Australia, wbicb represented a wall of coral rock tbat would extend 

 over 1250 statute miles in lengtb by from 10 to 90 miles in widtb. 

 Tbe calciilations tbat bad been made of tbe age of tbese modem 

 structures sbowed tbat many tbousands of years were requisite for 

 tbe work wbicb bad been performed by tbe existing races of tbe 

 coral polype. 



Dr. Wrigbt's address was followed by a paper on tbe G-eology of 

 Canada, by a member of tbe Malvern Club, Captain Serocold, wbose 

 discourse, illustrated by a well-drawn map, treated witb great ability 

 tbe general featm^es of tbe country, witb tbeir " Laurentian," " Pots- 

 dam," and " Trenton " beds, in many respects so different from any- 

 tbing in tbis country, yet presenting in tbeir contained organisms 

 features of analogy wbicb bave enabled geologists to correlate tbem 

 witb our own more familiar geological areas, so tbat tbey bave been 

 found mutually to illustrate eacb otber. 



Witb tbis paper tbe jDroceedings were brougbt to a close, and tbe 

 party broke up, after a day of great enjoyment. 



Great credit is due to tbe Honorary Secretary, Dr. Paine, of Stroud, 

 for tbe excellence and punctuality in tbe arrangements. — T.W. 



coi^iaiEisiPOi^riDEisroE- 



DISCOVERY OF WULFENITE, ETC., IN PEMBROKESHIRE. 



To the Editor of the Geological Magazine. 



Dear Sik, — It may be interesting to some of your readers to 

 know tbat I bave lately discovered, in Pembrokesbire, small, but 



