Red Marl andyelloiv Limestone are unconformalle. 1G7 



rjwesbyr village, paviers are dug, little if any inferior to those of 

 Ealand Edge ; the Freestone, Grindstones, Cisterns,- &:c. from 

 the 3rd Grit in Gwesbyr Qnarries, N of the Village near to 

 Talacre Hall, are not less similar to those of many quarries in the 

 same Rock in and near Derbyshire ; the Freestone of the l^th 

 Grit Rock in Mostvn Park and other places, proves more su- 

 perior to the s'one of any of the adjacent Rocks, than we find 

 to be the case in Derbyshire: it is here called the Black Csnnel 

 Rock. 



The Coal-field of Flint (with Wirral in Cheshire), Denbigh and 

 Salop Counties, of which I have been speaking, seems terminated 

 on all its north-east and east sides, by overlieing, and sometimes 

 unco7i formal ie strata, of Red Marl, or their imbedded red, soft 

 Gritstones ! ; this appears a very striking feature of the British 

 stratification, which I could not see sufficient reason for admit- 

 ting, in any case, until the last Spring, as 1 have mentioned in 

 a Note to page 330, of your xliiid volume*. 



While in Yorkshire, in July last, I was fortunate enough to 

 obtain from my Friend Mr. Andrew Faulds, of Worsboroughj an 

 intelligent and able Coal-agent, the sketch plan, section and 

 particulars of Garforth Colliery near Abberford, in which, four 

 scams of Coal occur, in 15U yards of sinking, on the west side 

 of the edge of tlie yellow Limestone, and in lower ground, dip- 

 })ing S, 1 in 20 ; and the basset edges of which seams were 

 known for considerable lengths, ranging W and E, directly for 

 the Limestone edge, under iv/uc/i they pass, and under the Sand 

 stratum also beneatb the Limestone ! ; which sand I ha%'e parti- 

 cularly mentioned in Derby. Report ii. 410 Note. Several pits 

 have l)eeii sunk in the eastern part of this Cohiery, v;hich pene- 

 trated the horizontal t/elloio Limeslone (with blue beds therein 

 I believe) 17 to 20 yards thick, and the Sand beneath it, before 

 the dippinn Conl-measures and seams of Coals above mentioned 

 were reached ! ! 



This new fact, of which no parallel presented itself, while I 

 was employed on my Derbyshire ►Survey or since, and of which 

 no author that I have read has mentioned an instance, viz. of the 

 yellow Limestone and its incumbent Sand (or saiidstone) being 

 eometinjes found uuconforviahle to the Coal-measures beneath 



* CandDiir requires iiie also to mention here, that before exanuiiin<; Pis- 

 tern lii'l. ill S.r.iliisby, in the south of Dcihyshire, my ahle friend ErKvanl 

 MairiiTiiiic, lisq. ol' Meuslram, mentioned to nie a report of old Colliers, 

 tliat Icvbl iled Aliirl and Gritstone, there covered </())/}iV(,^ Coal-measures ; 

 but on minutely exaniininj; the snrtace, and uK/uiriug on the spot (for the 

 v.orkh were loii|^ discontinued; I could hear ol' or see no such thing, and 

 li.ercforc did not mention it in my lleport, but which uow I regret. 



L 4 them, 



