28 



Nuneaton and Lickey quartzites might be much older than had 

 hitherto been supposed, so the occurrence of quartzites followed by 

 ' fucoid beds ' at Nuneaton suggested the possibility that the 

 Scottish rocks on this horizon might be of Lower Cambrian age 

 and might bear Olenellus. The same view occurred to the Scottish 

 Geological Survey, and was upheld by the discovery of such a 

 fauna there by Mr. MacConnochie in 1891. 



Once again, and for the last time, the Geological Survey paid 

 Lapworth the compliment of following his work and testifying to 

 its correctness. In the Nuneaton district they succeeded in finding 

 seven species, including Dictyonema sociale, not found by Lapworth, 

 thus raising the known fauna to twenty-one species.* They con- 

 cluded that the Stockingford Shales " belong to a late Lingula Flag 

 age, including a portion of the Lower Tremadoc Series." The 

 Carboniferous colour on the map was changed to ' Silurian/ and in 

 a later edition to ' Cambrian/ A new edition was also published 

 of the sheet containing the Lickey Hills. 



5. Harlech and the Longmynd. 



Two important pieces of work have not so far been published, 

 except in barest outline. They were carried on in occasional 

 leisure intervals after 1890. These are the mapping on the six-inch 

 scale (with portions done on the 25-inch scale) of the Longmynd, 

 which he carried out alone ; and that of the Harlech area, which 

 he did in company with Dr. T. Stacey Wilson. The former area 

 attracted him as the largest rock group below the Cambrian of the 

 Midlands, and on account of its relationship to the Uriconian 

 and Cambrian rocks of Shropshire. His conclusions were outlined 

 in the ' Geology of Shropshire/ published in f ' Geology in the Field/ 

 He recognised two Series in the Longmynd itself, apparently not 

 unconformable to one another as supposed by Blake. The higher 

 of the two the ' Red ' or ' Western Longmyndian ' he paralleled 

 with the Torridon Sandstone of Scotland. The lower he suggested 

 to the writer might be the equivalent of the rocks of Charnwood 

 Forest. He also indicated that the Western group of igneous 

 rocks of Uriconian type the Linley or Pontesford volcanic series 

 might be separate from and newer than the Cardington volcanic 

 series on the East ; but he never committed himself as to the 

 mutual relationships of the two series, the stratigraphy of which 

 is much complicated by faulting and possibly overfolding. 



The general classification and succession of the rocks of the 

 Harlech area were entrusted to Dr. A. R. Andrew for publication 

 in his paper on the Dolgelly Gold Belt.j These beds Lapworth 



* Geol. Mag., Dec., iii., vol. iii., 1886, pp. 547, 548 



t 6 7- PP- 74, 749. 

 J Geol. Mag., Dec., v, vol. vii, 1910, p. 161. 



