1814.] Outlines of the Minerahgij of the Och'il Hills. 125 



nates with greenstone. It occurs in decomposed fragments on the 

 lummits of Craiginnan, King's Seat, Bencleugh, and Dalmyatt. 

 These decomposed fragments have a vesicidar appearance, from a 

 very obvious cause (the rapid decomposition of the included 

 crystals). This appeaiance would no doubt be ascribed to volcanic 

 agency, by those whose zeal for hypothesis outstrips their love of 

 accuracy. 



Oidy'the lower portions of this rock contain crystals of horn- 

 blende, which give way at the higher points to those of calcareous 

 spar. 



12. Compact Felspar. — ^\''ery beautiful brick-red and flesh-red 

 compact felspar, possessing all the usual characters, forms the caps 

 of some of the smaller hills of the southern chain of the Ochils, 

 which extends from the neighbourhood of Dollar to the banks of 

 the Eden. Near Cupar it occurs so abundantly as to be the sole 

 material for repairing the roads. It appears to be the newest 

 member of the series, and to correspond both in its individual 

 characters and in its goognostic relations with the felspar of the 

 Pentland Hills, where it was first noticed forming distinct masses 

 by Professor Jameson. At the summit of Lucklavv this felspar 

 passes into hornstone. A solitary bed of it is to be found in the 

 alternating series of sandstone, claystone, and tuff, in VVormit 

 Bay. 



Vki>'s. 



Having tluis briefly noticed the prevailing rocks, I shall now 

 mention the veins traversing these rocks, in the order of the strata 

 in which they occur. Contemporaneous veins are not uncommon 

 in the clinkstone and greenstone ; but true veins are more rare. 

 The following is the order of the latter : — 



I. Calcareous spar. 2. Steatite. 



3. Heavy spar. 



4. Iron. 5. Cobalt. C. Silver. 



7. Copper. S. Lead. 



Calcareous Spar. — Highly crystallized varieties of the calcareou3 

 jpar traverse tl:c clinkstone near Woodhaven, and the claystone 

 near to the Rumbling Bridge. It has a greenish tint, and all the 

 usual characters. The dip and direction not easily determined. 

 The thickness from half an inch to two inches. 



Steatite. — Veins of this stcutile, varying from one to two inches, 

 divide the strata of the clinkstone and of the greenstone at the 

 section above Westcrtoun and Alva. They occasionally contain 

 iron pyrites crystallized, in cubes, in considerable quantities. 



Hcui'y Spur. — Straiii,ht lamellar heavy spar is tlic veinstone of 

 the n>iiie ijc|)iiid Castle Campbell, of those of Alva Hill, and 

 Airthry Hill, in all of which if tr:i,verses the newer varieties oF the 

 clinkstone which aj)j)roach to felspar through the grcen^'tone. 'J'hey 

 are four or six feet wide, witJi their outgoings to the soutli. Dip 



