266 UPPEE COAL-MEASTJEES OF THE MIDLANDS. [May I90I. 



new exposures laid open there recently. Eeferring to the green 

 rocks made np of igneous material, he asked whether they could 

 be correlated with the strata proved in the Sealands borehole near 

 Chester, which was found to contain resorted, disintegrated granite- 

 debris. 



Mr. T. C. Canteill expressed the belief that it would ultimately 

 be found that the sequence of higher Coal-Measures established in 

 North Staffordshire — or at least some green grits similar to those 

 of the Etruria Marls — were to some extent represented in Wyre 

 Forest also. However this might be, we now knew that the 

 lowest division of the so-called ' Permian ' of Wyre Forest contains 

 a Spiroi^his-limestone band and a thin coal, and in all respects 

 resembles the Keele Beds of jS'orth Staffordshire. "With regard to 

 Warwickshire, it was now still more certain that there is no 

 perceptible break at the base of the * Permian.' The supposed 

 outlier of these rocks, formerly represented on the Geological 

 Survey map west of Polesworth as having overstepped a con- 

 siderable thickness of the Coal-Measures, has lately been found by 

 Mr. Fox-Strangways to be a sandstone within the ordinary Coal- 

 Measures, and not ' Permian ' at all. 



Prof. T. T. Geoom said that the palseontological evidence adduced 

 by the Author in proof of his views seemed to be less convincing 

 than the stratigraphical. But even if the Coal-Measures proved to 

 be a conformable series in the areas described by the Author, there 

 might be unconformity elsewhere. There was, indeed, much evidence 

 of the existence of at least one unconformity in the Coal-Measures 

 over a wide area, both at home and abroad. Portions of the English 

 Midlands might well be exceptional in this respect, as had been 

 suggested on a former occasion. The Author had correlated his 

 ' Keele Series ' with the ' Salopian type ' of Prof. Hull's ' Permian.' 

 If this correlation were correct, the circumstance that the ' trappoid 

 breccia ' of the latter contained fragments of Carboniferous Lime- 

 stone and sandstone afforded additional proof of unconformity in the 

 Carboniferous Series, in areas which were adjacent to those described 

 by the Author, and in which unconformity had been deduced on 

 stratigraphical grounds. 



Mr. A. Steahan replied to Mr. Clarke that the rock found in the 

 Sealands boring was composed of granitic material disintegrated and 

 resorted, and was likely to be recognizable at the outcrop, but that 

 it did not resemble the green rocks. 



Mr. G. Baeeow and Prof. W. W. Watts also spoke. 



The Author said, in reply, that he was pleased to hear that 

 Mr. Clarke recognized the North Staffordshire sequence in Denbigh- 

 shire, and that Prof. Watts found the representative of the Etruria 

 Marls in East Warwickshire. No attempt had been made in the 

 paper to discuss the problems raised by Prof. Groom. 



