Dr^ Campbell's Stratification of Lancashire. 337 



lificationof ihe diflTcrent Counties in England, a work which 

 is so much wauled, that I hope gent-lenien in other counties 

 will he induced to imitate the excellent example of Dr. 

 Campbell, whose statements are highly valuable contribu- 

 tions towards the geology of the British islands, and I am 

 niduced to hope, that that gentleman will lake in good part, 

 a few remarks which I am about to make on his paper, and 

 he induced, as soon as opportunities will permit, to furnish 

 the information further wanted, either through the medium 

 of vour useful work, or in a letter to me, as may be most 

 agrecableto himself. First, J would remark, that the most 

 important of the four geological divisions of the county, 

 CIV. page 270), coloured blue in the map, is omitted at page 

 27s ; I should hope, through an accidental separation of 

 the manuscript sent to the Bath Society, and that Dr. Camp- 

 bell has it in his power, without delay or material trouble 

 to himself, to supply the account of this district, wherein 

 abundance of coah, and sand- stone, and some red marl, 

 gypsum, and salt springs*, and some lead-mines occur, as 

 well as an interesting bed of limestone in the coal-measures 

 nearArdwick, and thence towards Stockport. It would be 

 extremely desirable to obtain sections, or accurate accounts 

 of the sinkings of the pits or driving of long levels, at as 

 many of the Lancashire Collieries as possible, noticing the 

 direction and quantity of dip, and the h\rge faults which 

 have been proved, in the several Collieries, with an accouru, 

 as particular as possible, of the situation and nature of the 

 junction between the red marl and the coal-measures, and 

 whether a large fault etfects this separation ? as I suspect 

 to be the case, (passing near Stockport, Manchester, New- 

 ton, Prescot and Liverpool, perhaps,) or whether the coal- 

 measures dip under the red marl, or vice versa P It is not 

 less important to learn, the exact boundary line of the Coal- 

 measures to the north, whether at a large fault ? ranging 

 Irom near Keighley in Yorkshire, near to Colnc, S. of 

 Clitheroe, N. of Blackburn, S. of Preston, and N, of 

 Ormskirk, as I have conjectured, in a paper read before 

 the Royal Society in March last (now lately published), or 

 whether the shale and millslone grit, coloured brown in 

 Dr. Campbell's map, underlays the coal-measures, or vice 

 versa P Whether the limestone, coloured yellow, overlays, 

 or covers, the shale and grit coloured brown, or vice versa P 

 Whether, as there is a thin coal seam ranging out of York- 



• See Mr. Henry Holland's paper on tlie Salt -District of Cheshire and 

 Laiicaihire, loLciy piibli^licd, in the first volume of Ihe Geological Trans* 

 acticiii'i. 



Vol. 38. No. 163. Nov. ISIl. Y shire 



