1/2 Limestone at Whitehaven wanting in Mr. BahewelPs Section. 



article printed therein, because of the opportunity that you will 

 i hope now afford me, of adding some further observations, by 

 way of Postscript to my Letter, which I will now proceed to 

 make. 



I have never visited the neighbourhood of Whitehaven ; but 

 in several conversations which 1 had in the spring of 1806, with 

 Mr. Edward Martin, who furni:»hed materials for the account 

 published that vcar in the Philosophical Transactions, of the 

 Coal-Basin of South Vv'alcs, wherein he has long resided and 

 practised as a (ronl-Enginecr, I remember his telling me, that 

 he was brought up and taught his art, in the Coal district near 

 Whitehaven, and that the several Coal-seams there, could be 

 clearlv identified with those in South Wales, where he was then 

 more immediately employed. In his account to me of the latter 

 Coal-Field, in the published account thereof, or in anv of my sub- 

 sequent iiuiuiries while on the edge of this district or otherwivse, I 

 have not been able to learn, that Limestone occurs in the South 

 Wales Coal Basin, except at the lower edges of the Coal-measures ? 

 basseting from under them : I wish now therefore to supply an 

 omission in my Letter, where I should, when enumerating the 

 probaijle instances vf nncovformohle yellow Llnieslone on Coal- 

 77ieas7ire<!, (p. 168) have mentioned tliat at Preston- Hows, l|m. 

 SW of Whitehaven, twelve yards of yellowish i-/'/«e'>s/o//f', and then 

 43 yards of red Grit Rock, are sunk through at the top of a Coal- 

 Pit, that is 21(; vfirds deej) ! ; the niinutoparticulars oi Which were 

 long ago published by Mr. Dixon, and have been copied into 

 the 2d Edition of WiUiams's " Mineral Kingdom," vol. ii. ji. 246 ; 

 and I am anxious to lose no time, in proposing the addition of 

 this important fact, to Mr. Bakewell's Section* at top of your 



' 2d 



• This Seclioji by Mr B. nimt finui his rlrsriiption be supposed to pass fioTii 

 K\E to WSW, from ncHv SuTuleiland, passiu? nut far from Pciniili ai)(l Keswick, 

 t> near Wliiteliavcn, as utlierwise, it could not cross llie cowrse S'.ate inodiitaiiis 

 iionr tbe Lakes (p. 90) ; a peisun travellini; this line, cuiild not fail to sec and cross 

 the reniarkabte LimeslDiie Rock, ranginir X\V with an eastern dip, through Shap, 

 LoKther, W of Penrith, through Graystock, &a', between the uo less remarkable 

 red Saiidslnneof Penrith and tlie Slate moinitalns ; round all tbe eastern, northern 

 and western sides of which slates I believe thisLimestonetolap, hut which we search 

 for in vain in Mr. D's Section ! ; and wherein it would IbcHcvc b-.' found, that 

 between C and the Slate, considerably too little space is a'lo"ed, and that a lrmif:h 

 of Limestone is there omitted, eontainin-r Cual-measures within it. (having small 

 Coal works locally scattered thereon, of which T gave Mr. B. a hint in your xliid vol. 

 jjageo"?) um^er anintcunjormalle cover a( Ved Marl, eoiitaining tiypsuni (nearCul- 

 gaith, &.C. Forster, p. 44,) and Ucd Sandstone, &-c. locally distributed thereon: 

 and which over-lieing " old red sandstone," of the Gcogrtosts, has, as 1 believe, 

 been mistakenly represented by Mr. Forster, as passing^ under the strata of his 

 Section; whereas it will more likely he found, that the lower and calcareous parts 

 of these strata are made to approach each other, in or westward of the Cross-Fell 

 range of Mountains, b\ the thiiuiiivg and almost total disappearaocc of the interven- 

 ing strata, and growing; thinner themselves also {an happent on tlie Mii side of the 



vulc 



