Yol. 6S.] SUCCESSION- IN THE NOETH-WEST OF ENGLA^-D. 545 



would then correspond to horizon e and some part of the ' Millstone 

 Orit ' of the Bristol Area. 



The limiting line hetween the beds known as D^ and D^ in the 

 Midland and other areas is by no means clearl}^ defined in the 

 jN'orth- Western Province, parth^ on account of the barren character 

 •of the higher limestones in the Shap District, and partly on account 

 of the complete absence of fossils from the whole of the upper 

 portion of this series in the Kirkby Lonsdale and JFurness Districts. 

 It is true that, in the Pennine District, one or two specimens of 

 CyatJicLvonia cornu have been collected from the shale underlying 

 the Scar Limestone ; but this circumstance does not entitle us to 

 correlate the beds above this horizon with the Cyathaxonia Beds of 

 the Midlands/ 



With regard to the highest fossiliferous marine limestone which 

 occurs at Botany, there can be no doubt that it must be correlated 

 with an horizon well up in the Oyatliaxonia Beds of the Midland 

 area, such forms as ScJiellwienella radialis^ Productus aculeatus, 

 Spirifer triangularis, and Phillipsastrcm, together with several 

 others, never occurring below the summit of the Lonsdalia Beds in 

 Ihe ;N"orth-Western Province. 



With regard to the beds underlying the Dihunopliyllum Zone, the 

 Productus-corrugato-hemisiDhericus Zone appears to represent closely 

 the Semimda Zone of Dr. Vaughan's Bristol paper ^ ; as, however, 

 ■the upper and lower limits are not absolutely certain, it will be 

 best at present to avoid absolute correlation with this zone. The 

 name ' Serninula Zone ' also, is scarcely applicable to this division in 

 the North-Western Province, although Semimda Jlcoidea is present 

 occasionally in the zone. This genus is, however, much more 

 characteristic of the upper portion of the Athyris-glahristria Zone 

 in the North- Western Province, where it is represented by abundant 

 ispecimens of S. af^. Jicoidea together with S. gregaria. 



Of the three portions into which the zone is divided, the Gastropod 

 Beds, which form the lower portion, appear to be closely equivalent 

 to the Sj^ beds of the Bristol Area, while S^ is represented by the 

 Gyrtina-carhonaria and MematojjJiy Hum-minus Beds of this classi- 

 iication. 



The Miclielinia Zone, has been considered by me to represent 

 generally C^ of the South-Western Province, the upper limit 

 being taken at the Clisiophyllum-midtiseptatum Band, above which 

 the first specimens of Lithostrotion occur ; but the exact horizon 

 where the base of C^ should be drawn in Westmorland is not easy 

 to fix. In the type district the base of C^ is taken at the Oatmeal 

 Bed in Docker Beck, and this corresponds with the Sjpirifer- 

 furcatus Band of the Arnside and Grange Districts. This will 

 throw the beds between the Oamarotoecliia-proava Band and the 

 TJiysanojphyllum. Band inclusive, into 0^ of the Bristol Area. The 

 lower beds at Shap Abbey and Stone Gill contain a form of AtJiyris 

 jglahristria (near A. lamellosa), which, Dr. Vaughan informs me, 



I This Tiew has been arrived at affer conference with Dr. SiWy 

 ^ Q. J. G. S. vol. Ixi (1905) p. 194. 

 Q. J. G. S. No. 272. 2 e 



