GEOLOGY. 



A Tahilar Arrangement of all the Rock Formations in England. 



NO 



Class I. — Pnmai-y Rocks. 

 Granitic Formation. 



Granite 



Gneifs 



Mica-flate 



Quartz -rock 



Marble 



Trap 



Serpentine 



Porphyry 



Sienite 



Order of fucceffion variable ; 

 thicknefs unknown. 



N° 



Class II. — Tranjltlon Rocks. 

 Grey Wacke Formation. 



Lime-ftone 



Trap 



Porphyry 



Grey wacke-flate 



Grey wacke 



Order of fucceffion variable; 

 thicknefs unknown. 



N°5- 



Firft fajid-ft-one 



Class III.^ — Secondary Fktz Rocks. 

 Structure ufually ftratified, but the Strata much diflocated and inclined. 



Localities. 



Created nbferved 



thicknefs of ilie 



ftrata. 



Feet. 



Old red fand-ftone 



- 2000 



Mountain, or metallife- 

 rous lime-llone 



Mill-flone grit 

 Principal coal meafures 



' Red, often micaceous fand"J 



or fand-ftone, containing f -rr ».• .„• -d „ 

 r , ,■ , , ° VVan Mountani, lirecon 



iuborduiatcly conglomerate i 



pebbles from the older rocks J 

 ' Calcareous concretions in beds { Heavytree, Exeter 



and mlulated mailes j ■' 



Porphyry and trap in beds and j Thoverton, near Exeter 



mailes ) 



Often a compaft coralline mar-^ 



ble, alternating with beds off Derby (liirc, four beds, and ) „ 



Ihale, chert, grit-ftone, and / three of trap j ' 



trap 



1 



Crofs-fell, 19 of lime-llone, 50 ) 



of grit-ftone, 60 of fliale j 



Coarfe filiceous fand-ftone, I -tr 1 n • j •ri 1 n ; 



. , , , , r T • .- Yorkiiure, and JJerbylnire 



with pebbles 01 white quartz J 



2749 

 260 



TNewcaftle, 82 beds of grit-"J 

 } ftone, ftiale, and coal, off „ 

 \ which nine of coal are ( ^ 

 ^ wrought } 



N'4. 



Strata often lie horizontally on the Edges of the inclined Beds of the laft Formation 

 Magneiian lime-ftone 



\ fometimes of a pink hue 

 Second fand-ftone, [" Fine-grained, red liliccous, 



or grand gypfum, and <^ New red fand-ftone, I fometimes with pebbles of 



fait formation fecond fand-ftone of^ quartz, and alternating with 



Werner | red marie, containing fait 



l_ and gypfum 



f Yellowifli, fine-grained, and } Knarefborough, Bolfover, and 



Sunderland 



Salop, Lancafliire, StafFord- 

 fliire, Devon, Cambridge, 

 Plains of Chefhire, and 

 Worilerftiire 



300 



400 



J 



N°5. 



