1869.] 



MOEaAKS — SPATHOSE-IEON-OKE TEINS. 



255 



mentions a tunnel, 430 feet above the sea-level, bored through the 

 whole thickness of one of the seams for a distance of between 150 

 and 250 feet. A cross tunnel near the mouth of this reached coal at a 

 distance of 50 feet. The coal is carried down to the shore by men, 

 mules, and ponies ; its price on the spot is 4 dollars per ton. 



Mr. Adams also stated that, from what he had heard, there are 

 unworked coal-seams in the neighbourhood of Otarunai, and indi- 

 cations of lead, copper, and even gold in various parts of the island. 



2. On a Peculiaeity of the Beekdon" Hills Spathose-Ieon-Oee 

 vEii^s. Bj M. MoEaA^s, Esq. 



(Communicated by Warington W. Smyth, Esq., F.R.S., Y.P.G.S.) 



[Abridged.] 



AccoEDi]vrG to the author the Brendon Hills consist of a Devonian 

 Slate, dipping about S. by E. at 30°, and ]^. by W. at 60° on the two 

 sides of the axis of elevation. The cleavage-laminae dip nearly S. 

 by W. at 80° ; and the cleavage-strike varies but little from E. by N". 

 and W. by S., forming only a slight angle with the main axis of 

 elevation. 



The clay-slate of the Brendon Hills contains very fine lenticular 

 veins of spathose iron- ore exceedingly rich in manganese, the dip and 

 strike-lines of which are not influenced by irregularities in the strata, 

 but for the most part follow the direction of the cleavage-planes, 

 although, as they are often tortuous, they do not constantly coincide 

 with them (fig. 1). 



Eig. 1. — Cross Section of a Vein. 



The dotted lines represent the cleavage. 



hhh. Bedding lines, vv. A vein at about the average dip. 



The depth of the veins has not been ascertained. The main ones 

 extend for several miles in length, sometimes dividing and reimi- 



