482 Dr. H. Woodward — Kew Carboniferous Trilohites. 



Carboniferous series from which this ancient group of Crustacea has 

 yet been obtained." At that time, also, I had provisionally referred 

 these specimens to Phillipsia Eichwaldi, Fischer, sp., and to Fh. Colei, 

 M'Coy ; bat in the question of the geological horizon at which they 

 occur I had not then enjoyed the advantage of Mr. Tiddeman's 

 opinion, nor had I visited the spot and examined the beds in situ. 

 I should therefore wish to modify the remarks I then made, both as 

 regards the species of the Trilobites, which I now consider to be 

 distinct, and also as to the exact bed they occur in, which, in 

 deference to Mr. Tiddeman's judgment, I am led to consider must 

 be placed lower down in the series. 



As I was very desirous to ascertain what the geological horizon 

 of these Trilobites i*eally was, I decided to pay a visit to the locality, 

 and, being most cordially invited by the Eector, the Kev. Herman 

 Walmesley, S.J., and by Mr. Pollen, I started for Stonyhurst on the 

 10th of September, where my friend Mr. R. H. Tiddeman, M.A., 

 F.G.S., of the Geological Survey, most kindly met me, and spent a 

 day and a half going over the ground most carefully with Mr. Pollen, 

 Mr. P. Stapleton, and myself. 



Mr. Tiddeman pointed out to me that, in his opinion, we were 

 dealing with the shales and limestones overlying the Clitheroe Lime- 

 stones, and that our Trilobites came from near the top of this series. 



TABLE OF THE CARBONIFEROUS ROCKS IN CRAVEN.i 



Southern or Rowland 

 Type. 



Coal-measures 

 (Ingleton) 



Millstone Grits 



BowLAND Shales 



Pendleside - Grits 

 (inconstant) 



Pendleside ^Lime- 

 stone (with KnoU- 

 Reefs) 



Shales, with Lime- 

 stones (Trilobites 

 occur here on R. 

 Hodder) 



Clitheroe Limb- 

 STONEs (with Knoll- 

 Reefs) 



Feet. 



1500 



3900 



300—1000 



0—250 



0—400 



2500 



X3250 



No base. 



t 



Feet. 



400—900 



400—800 



Northern or Toredale 

 Type. 



Coal- 

 measures 



Millstone I S t^ 'S 

 Grits I - 2.S 



Yoredale Series 



The Carboniferous 



Limestone (with 

 conoiomerates at 



"These beds," said Mr. Tiddeman, "were marked as ' Yoredale 

 Beds ' in the earlier edition of the Survey Map, but after the 



' Proceedings Yorkshire Geological and Polytechnic Society, 1890, vol. xi. pt. 3. 

 ^ ^ Both these sets of beds are considered to be absent on the Hodder. 



