122 REPORTS ON THE STATE OF SCIENCE. 



with Protolenus and below the base of the Quarry Ridge grits. It has 

 hthological affinities with the Grey Limestones below, and with the grits 

 above, but its faunal affinities are not yet determined. ' 



6. The conglomeratic portion at the base of the Quarry Ridge grits 

 contains angular and subangular fragments of the sandstones and lime- 

 stones that occur below it, and its matrix yields species of the genera 

 Paradoxides, Dorypyge, Conocoryphe, Hyolithus, and Stenotheca. 



7. The Quarry Ridge grits are succeeded above by a group of shales 

 (interspersed with bands of grit), called the Quarry Ridge shales, and 

 have a thickness of, probably, 300 feet. 



8. These shales are followed by the Hill House group, consisting of 

 flags (with Dorypyge), grits (with Ptychoparia and other undetermined 

 trilobites), and shales of unknown thickness with included bands of grit. 



9. A considerable width of unexplored ground intervenes, after 

 which the Shoot Rough Road sandstones — with Paradoxides rugulosus 

 Corda and the Shoot Rough Road flags, with P. davidis Salter, Agnostus 

 fallax Linnrs., Acroireta socialis von Seebach, Orthis Lindstroemi 

 Linnrs., and other fossils — have been opened up. 



10. Superior to these flags, and in apparent conformity with them, 

 there occurs a large group of shales from which only a scanty fauna has 

 been collected. The dominant species is a form closely allied to Orthis 

 lenticularis Wahl. 



Owing to the faulted nature of the ground, it is impossible to give 

 reliable estimates of the thicknesses of the various group recognisable in 

 the Comley area. A study of their general disposition and horizontal 

 extent points to an aggregate thickness for the whole of the Comley 

 Cambrians exceeding 1,500 feet, and, very possibly, extending to twice 

 that amount. 



The diagram above shows the general relations of the various 

 groups so far as they are at present known. The Shoot Rough Wood 

 shales at the top- have not been touched by the excavations. Their 

 Tremadoc age is inferred from Dr. Callaway's discovery in the shales 

 east of the Lawley of ' Lingulella Niclwlsoni and Shineton graptolites ' 1 

 and from Mr. Gibson's subsequent detection in the shales of Shoot 

 Rough Wood of an example of Dictyonema. 



The thickness (100 feet) assigned to the Wrekin quartzite is taken 

 from Dr. Callaway's estimate, 2 the excavations not having been suffi- 

 ciently extended to allow of any direct measurement of it being made. 



I have again to acknowledge my indebtedness to Mr. Philip Lake for 

 his help in determining the trilobites, and to Dr. C. A. Matley for 

 exhaustively examining the brachiopods of the higher horizons, and I 

 am very grateful to them for their help. My best thanks are also due 

 to Professor Lapworth for continued advice and encouragement during 

 the whole of the excavations. 



1 Q.J.O.S., vol. xxxiv., 1878, p. 758. 2 Ibid., p. 759. 



