Professor Edicard Hull — The Toarcian of Bredon Hill. 541 



and below. At the point selected, east of Gedre, there is a small 

 diagonal fracture along which a few inches of the black schist has 

 been squeezed in. The fallen side shows intense and irregular meta- 

 morphism at a few yards distant, and on the neighbouring high road 

 it rests admittedly on the granite. Similarly, ai'ound the Cambo 

 granite, the admitted Flysch which passes insensibly to- granite, 

 and which is visibly traversed by granite and ophite veins, has been 

 figured as unconformable overlaps or outliers. The author of the 

 Gavarnie sections especially praises the observations of Jacquot, 

 by which nearly all the Cretaceous of his own map was formerly 

 classed as Cambrian. By reversing the process, he preserves the 

 proof that all previous observation was wrong. 



Y. — Observations on Mr. S. S. Buckman's Paper on tub 



Toarcian of Bredon Hill. 



B)^ Professor Edavaed Hull, LL.D., F.E.S. 



THE above paper, read before the Geological Society on the 27lh 

 May last, having just I'eached my hands, with the discussion.^ 

 I trust you will allow me to make some observations thereon, not 

 having been present on the occasion. As my name does not appear 

 once throughout the paper it might at first sight be considered 

 unnecessary, if not impertinent, for me to take any direct notice 

 of its contents. I must therefore ask permission to state the 

 reasons for this communication as briefly as may be, and they may 

 be summed up in a single sentence — that, being responsible as the 

 officer of the Survey who carried out the geological mapping of 

 the Cotteswold Hills and of the outlying Bredon Hill, I cannot 

 allow reflections on its accuracy to pass unanswered. 



It was about the year 1853 or 1854 that my chiefs, Sir R. I. 

 Murchison and Professor Ramsay, gave me instructions to undertake 

 the geological survey of Sheet 44 of the Ordnance Survey, with the 

 exception of the northei'n portion, which was entrusted to Mr. H. H. 

 Howell. To the south of Sheet 44, the late Mr. Bristow was 

 engaged in mapping the Oolites in the Bath district, and for some 

 days I had the advantage of his practised guidance in learning the 

 details of field-surveying amongst the Oolites. I accepted the 

 commission with enthusiasm ; few more choice districts for a young 

 geologist were available, and throughout the period, about three 

 years, during which I had the work in hand, I enjoyed the ready- 

 help and advice of my late valued friend Dr. Thomas Wright, F.R.S., 

 of Cheltenham. It so happened that this was the very time 

 during which Dr. Wright was engaged in his palasontological 

 examination of the escarpment of the Cotteswold Hills, which led 

 to his determination of the limits of the Liassic series on the one 

 hand, and of the Oolitic on the other. Up to the time when 

 I commenced my survey the yellow and variegated sands of 

 Leckhampton and Crickley Hills, near Cheltenham, of Frocester 

 Hill, and southwards, with the " Ammonite bed " at the top, were 

 regarded as belonging to the Inferior Oolite. But when Dr. Wright 

 1 Q.J.G.S., vol. lix, p. 445. 



