Vol. 57.] THE UPPER COAL-MEAStTRES Oi* THE MIDLANDS. 265 



VII. Bibliographical List. 



[1] E. W. BiSNET. ' The Upper Coal-Measures of England & Scotland ' Trans. 



Manch. Geol. Sec. vol. vi (1866) p. 38. 

 E. Hull. ' The Geology of the Country around Oldham ' Mem. Geol, Surv. 



1864. 

 E. Hull. ' The Triassic & Permian Rocks of the Midland Counties of England ' 



Mem. Geol. Surv. 1869. 

 E. Hull & A. Steahak. ' Geologv of the Country around Prescot ' Mem. 



Geol. Surv. 3rd ed. (1882) pp. 44'-48. 

 A. Steahan. ' The Geology of the Neighbourhoods of Flint, Mold, & Ruthin ' 



Mem. Geol. Surv. Supplement (1898). 

 [2] J. D. Kendall. ' The Whitehaven Sandstone Series ' Trans. Fed. Inst. Min. 



Eng. vol. X (1896) pp. 202-24. 

 T. V. Holmes. ' Notes on the Whitehaven Sandstone ' Geol. Mag. 1896, p. 405. 

 A. Steahan. Ann. Rep. Geol. Surv. for 1894, p. 272. 

 13] A. Ramsay. ' The Geology of North Wales ' Mem. Geol. Surv. 2nd ed. (1881) 



pp. 261-68. 

 [4j R. I. MuECHisoN. ' Silurian Sj'stem ' 1839, p. 83. 



J. Peesitvich. ' On the Geolog}^ of Coalbrookdale ' Trans. Geol. Soc. ser. 2, 



vol. V (1840) pp. 428 et seqq. 

 D. C. Davies. ' The North Wales & Shrewsbury Coalfields ' Quart. Journ. Geol. 



Soc. vol. xli (1885) Proc. p. 107. 

 M. W. T. Scott. ' On the Symon Fault in the Coalbrookdale Coalfield ' Quart. 



Journ. Geol. Soc. vol. xvii (1861) p. 457. 

 D. JoifES. 'Denudation of the Coalbrookdale Coalfield' Geol. Mag. 1871, 



pp. 200-208. 

 Id. 'The Structure of the Forest of Wyre Coalfield' Trans. Fed. Inst. Min. 



Eng. vol. vii (1894) pp. 287-300 & 577 ; also vol. viii (1895) p. 356. 

 W. J. Claeke. 'The Unconformity in the Coal-Measures of the Shropshire 



Coalfields ' Quart. Journ. Geol. Soc. vol. Ivii (1901) pp. 86-95. 

 [5] T. C. Canteill. ' On Spirorbis-limestone, &c. in the " Permian " Rocks of 



W^jTe Forest ' Quart. Journ. Geol. Soc. vol. li (1895) pp. 528-48. 

 Id. ' Geologj' of the Wyre Forest Coalfield,' Kidderminster, 1895. 

 [6] H. H. Howell. ' The Geology of the Warwickshire Coalfield' Mem. Geol. Surv. 



1859, 

 C, Fox-Steangwats & W. W, Watts. ' The Geology of the Country between 



Atherstone & Charnwood Forest ' Mem. Geol. Surv. 1900, p, 28. 



Appendix. 



Microscopic slides of specimens of the green grits characteristic of 

 the Etruria Marls in Xorth Staffordshire, and of their representatives 

 at Thiirgarton and in South Staffordshire, have been examined by 

 Mr. George Barrow, F.G.S. He states that : — 



' the rocks resemble one another in the fact that they are built up of frag- 

 ments mostly of igneous origin, set in a matrix which has resulted from the 

 complete decomposition of still smaller fragments of similar material. Whether 

 the rocks themselves are true ashes, or are derived from the comminution of 

 lavas, it is not possible to decide with certainty. No fragments with hour- 

 glass form have been recognized, but tbe finer material is so completely 

 decomposed that such may well have been once present. If tbey be not true 

 ashes, the material of which these rocks are composed has not travelled far.' 



Discussion. 



Mr. "W. J. CL4.RKE congratulated the Author on his excellent paper. 

 He considered that the Author's correlation of the North Staffordshire 

 and Denbighshire Upper Coal-Measures was correct, and that when 

 the officers of the Geological Survey dealt with the Wrexham 

 district they would find still further confirmation in the many 



Q.J. G. S. :No. 226. T 



