the Super-position of the Strata of England. 53 



Portland stone, clancli, or Oxford clay; 2nd oelite, 

 fuller's-eartli, &c. 8iC. &c. 

 Measures from the great oelite to the upper or marly red, 

 containing a great thickness of blue clay, the blue lias, 

 and white lias limestone, &c. 

 First division of the great upper coal scries, comprising 

 5 or 6 small coals which have been sunk to, and got 

 under the lias limestone at Duncarton, Camberton, 

 Timsborrtiigh,&c. &c. Somersetshire. 

 Second division of the upper series, as now worked to a 

 considerable extent in the Foiesl of Dean, above the 

 Great Gray or Pcnnard Rock. 

 Third division of the upper coal scries, between the Great 

 Gray Rock and the third limestone series; comprising 

 the coals worked for iron making, and for other pur- 

 poses, alons the creat Wekh coal basin. Those worked 

 at Kingswood and Ashton, Nailsea and Bake<Aell, near 

 Bristof, and in the neighbourhood of Coleford in Dean 

 Forest. 

 The third limestone series: 

 Great red. 



Yellow, or maencsian limestone. 

 Derbyshire and Yorkshire coal series: 

 The four great sandstones, containing the stinking coals, 

 and forming very hich land and precipitate termina- 

 tions along^a consid'erable extent of Derbyshire and 

 Yorkshire. 

 The great or limestone shale. 

 Derbyshire limestone series, comprising 1st, 2nd, 3rd, 



4th liincstone alternating with toadslone. 

 I shall now beg leave to reuuirk what is said to be stated 

 by Mr. R. Bakcwell, in his Lectures ; namely, that the 

 Derbyshire fourth limestone is seen in Yorksnirc, resting on 

 slate. Could this fact be established, it would be inltresiing 

 in the extreme. PiUt when this gentleman appeals to simi- 

 lar instances in Shropshire and \u Wales, I am afraid he re- 

 fers to one of those numerous furmaiions in the great red, 

 commonlv denominated primitive. Examples of this Mtrt are 

 to be found in the neighbourhood of Charnwood Forest, 

 Mount Sorrel, the Malvern hills, &c. I agree wiili him as 

 to the fact of limestone covering slate, and this slate resting 

 upon granite; but ( difTer fron/him by assigning to the gra- 

 nite a different place in the strata. I am not vet saiislied 

 thai the granite is the foundation of the series, but m many 

 cases only an accidemal formation in the great red, some- 

 times gtratified and sometimes assuming the form of »o ir- 

 D 3 regular 



