CLEMENT LE NEVE FOSTER' S NOTES ON HAYTOR IRON-MINE. 629 



It appears that there are three beds of iron-ore. No. 1, or the 

 uppermost, is 10 feet thick, with partings of rock giving about 

 2 feet of waste ; No. 2 is 14 feet thick, with about 1 foot of waste ; 

 and No. 3 is proved to be at least 6 feet thick, with a similar amount 

 of waste. There is altogether therefore a total thickness of some 

 26 feet of iron-ore. This is much more than is shown by Mr. King- 

 ston ; but then it must be recollected that the adit intersects the iron 

 at a depth of some 20 fathoms below the old open work, and there 

 has been plenty of room for changes in thickness of ore and partings 

 to occur. 



The beds strike about E. 25° S., and dip northwards 30°. 



A fourth bed of magnetite, about 3 feet thick, is seen cropping out 

 about 300 yards N.E. from the others, and appears to be running 

 parallel to them. 



It will be seen by referring to the Geological-Survey Map, Sheet 

 25 (where the outcrop of the iron is incorrectly marked), that the 

 line of junction of the Granite and Carboniferous rocks is running 

 here about north and south. Consequently, as the Carboniferous 

 rocks strike about W. 25° 1ST. against the granite, it is evident that 

 the granite has broken across the strata here. This same fact is 

 proved in another way. Just above No. 3 bed is a layer of fine- 

 grained granite, 6 or 8 inches thick, running parallel to the stratifica- 

 tion. At first sight it might be thought to be interbedded; but 

 closer examination shows that it sometimes breaks across the strati- 

 fication, as is seen in fig. 2. It is consequently an intrusive sheet, 

 and, if it could be traced, would doubtless be found to be connected 

 with the neighbouring mass of granite. 



Fig. 2. — Granite hreahing across stratified rock, Hay tor Mine, 



For explanation of letters see fig. 1. 



Excepting this granite vein, the ore and enclosing rocks {country') 

 have simply the appearance of altered strata. Beds of iron-ore 

 deposited contemporaneously with shales and sandstones seem to have 

 been subjected to a metamorphic action, probably due to the proximity 

 of the granite. The iron-ore, perhaps originally in the form of beds 

 like the Cleveland ore, has been altered into magnetite ; whilst the 

 change undergone by the shales and sandstones consists in an extreme 



