1868], HULL PENDLE HILLS. 319 



geologist. I must remark, however, that, notwithstanding the re- 

 semblances pointed out so forcibly by Dr. Falconer, Plagiaulax 

 appears to me to be, on the whole, further removed in structure 

 from the existing forms than ThylacoUo ; and as long as we have 

 not the evidence that its cranium and upper teeth would afford, its 

 affinities must be regarded as less definitely determined. 



PosTSCRiPi. — Since the above was written, my attention has bein 

 called to some remarks " On the Dentition oi ThylacoUo carnifex, Ow.," 

 by Mr. Gerard Krefft, the able Curator of the Australian Museum, 

 Sydney, in the Ann. & Mag. Nat. Hist. vol. xviii. ser. 3, p. 148, 1866, 

 in which he gives his opinion that " this famous marsupial lion was 

 not much more carnivorous than the Phalangers of the present 

 time," and adds a conjectural restoration of the then unknown 

 anterior part of the skull and incisor teeth, which subsequent dis- 

 coveries have in great measure confirmed. 



2. On the Thickness of the Carboniferoits Eocks of the Pendle 

 Eange of Hills, Lancashire, as illustrating the Author's views 

 regarding the " South-easterly Attenuation of the Carboni- 

 ferous SEDiMENTARr Strata of the North of England." By 

 Edward Hull, Esq., M.A. (Dublin), F.U.S., E.G.S., of the Geo- 

 logical Survey of Scotland *. 



In the following paper I purpose bringing forward some new facts 

 recently ascertained in the district of Burnley and the Pendle 

 Range, in confirmation of certain views advanced on a previous 

 occasion, regarding the relative distribution of the "sedimentary" 

 and " calcareous " strata of the Carboniferous series in the North 

 of England. These views are published in the Journal of this 

 Society t ; and as introductory to the matter in the present commu- 

 nication I must ask permission very briefly to recapitulate them. 



In the paper referred to, I endeavoured to prove that to the north 

 of an old neck of land, or "barrier," which stretched across the 

 centre of England from Shropshire, and which was formed of Silu- 

 rian and Cambrian rocks, the Carboniferous strata were deposited 

 originally upon the following plan : — On the one hand, the calca- 

 reous member (the Mountain-limestone) attained its greatest ver- 

 tical development along the northern flanks of this barrier in 

 Derbyshire, and thence thinned away northward and westward, 

 and, as had been long since pointed out by older geologists, be- 

 came intercalated with sandstones, shales, and beds of coal in the 

 North of England and Scotland, where it appears in its most de- 

 based and attenuated form ; on the other hand, the sedimentary 

 beds of sandstone, shale, &c. were deposited in greatest force towards 

 the north-west, diminishing in thickness towards the south-east of 

 England, — the development of the one set of strata being in the 

 inverse ratio of that of the other. 



* Communicated with the consent of the Director-General qf the Geological 

 Survey. + Vol. xviii. p. 127. 



