Geological Society. 453 



of the Skiddaw region, and composed of chiastolite- and hornblende- 

 slates, gneiss, ivc, apparently in irregular order. 



V. Granite*. 



No. I, the grauwacke of Cumberland, is unquestionably the equi- 

 valent of the upper part of {a) the grauwacke-slate of Somerset, 

 Devon, and Cornwall. No. II, the green-slate of Cumberland, has 

 no representative in Cornwall ; but seems to be identical with part 

 of (No. 3) the Snowdonian formation of Wales. No. Ill, the clay 

 slate, and IV, the crystalline schistose rocks, present analogies with 

 (c) the metalliferous killas of Cornwall : — and on the whole, the 

 suite of the transition and primary rocks in Cumberland assists in 

 bringing together the phasnomena of Wales and Cornwall; and in 

 connecting the several groups in the distant parts of England, in a 

 series of similar and probably contemporaneous formations. 



The labours of the Geological Society of Cornwall are continued : 

 and a work, of which the first volume has been published, by Mr. 

 John Taylor, one of the principal miners in this country, promises 

 considerable additions to a department of knowledge comparatively 

 new to our scientific literature, but intimately connected with our 

 pursuits. This work is entitled " Records of Mining f ;" anditpro- 

 poses to embrace " reports and statements upon particular mines, 

 and the produce of metals, in various districts ; notices on Geological 

 facts relating to mining ; discoveries of ores and minerals, and de- 

 scriptions of existing processes connected with the treatment of ores, 

 and the operations of smelting, or other modes of reduction; with 

 investigations of the methods of working now usually employed in 

 different countries, and of projected improvements; and descriptions 

 of machinery or implements destined to the service of the mines." 

 The editor justly adds, that many facts relating to these subjects, 

 continually present themselves to observation, all record of which is 

 lost, for want of a proper depository ; and that not only is a quan- 

 tity of valuable matter constantly occurring in the reports and state- 

 ments upon our British mines, but that much more may be expected 



* The mineralogical axis of all this tract extends from the centre of the 

 Skiddaw region to the neighbourhood of Egremont. On the north of this 

 line the formations are repeated, with the exception of No, I., which is pro- 

 bably buried under the unconformable old red sandstone and mountain lime- 

 stone ; and on this northern side, notwithstanding its less extensive de- 

 velopement, there is a group of mountains, almost entirely composed of 

 diallage-rock (Euphotide) and other minerals, of which we have no trace on 

 the south. These occupy the base of the green-slate and porphyry series, 

 (No. 3.) of Wales ; and seem to be in the exact place of (6.) the serpentine 

 of the Lizard in Cornwall. 



There is on the west side of Cumberland, another formation of granite 

 and syenite, which underlies, traverses, and overlies the chiy-slatc, No. III., 

 and is considered as the great centre of elevation of tlie region. It never 

 overlies No. II.; but is probal)ly connected with sycnitic dykes, and other 

 detached masses of crystalline rock, which do not belong to the ordinary 

 rocks of superposition. 



f " Kccords of Mining, edited bv John Taylor, I'. U.S., &c.," Ho. with 

 plates. London; Murray, IK29. (Sec our present, vol. p. 297. — Euit.] 



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