504 PEOP. E.J. GARWOOD 01^ THE LOWEE CAEBONIFEEOTJS [DgC. I912, 



The Daviesiella-llangollensis Band. — l^o good exposures 

 occur in the line of section to the east of Lane-Head Quarries, 

 until we pass the Midland Railway-station ; but, immediately 

 east of the railway, several good outcrops of an impure shaly 

 limestone can be seen between the station and Wharton Hall : these 

 abound in specimens of D. llangoUensis^ together with Froductus 

 of. mcLvimus. This band is of especial interest since, with the 

 exception of the young and doubtful examples occurring in the 

 Chonetes-dM. comoides Band at Grandy, this species has not been met 

 with in the ISTorth- Western Province. As at Llangollen, the band 

 appears to lie near the base of the Lower Dibunoi^hyUum Sub-zone. 



Above the D.-llangollensis Band the beds resemble the typical 

 white limestones of the Lower Dibunopliyllum Sub-zone of other 

 districts ; they are, however, cherty and somewhat barren of fossils, 

 and neither CyatJiopliijUum murcliisoni nor DihunojjJiyUmn occur. 

 The highest exposures contain reefs of LitJwstrotion junceiim, which 

 elsewhere is more characteristic of the base of the Upper Dihuno- 

 jiliyllum Sub-zone. On the whole, then, the Lower Dibunopliyllum 

 Sub-zone in the Eavenstonedale District is characterized by its 

 shaly and cherty character, by the absence of Dihunopliyllum and 

 Cyathopliyllum murcliisoni, and by the presence of the Baviesiella- 

 llangollensis Band near its base. 



jNo beds of Upper Dihunop)liyllum age occur in the Kavenstonedale 

 section. 



IV. The ArjStside aitd Caenfoeth Disteicts. 



The Arnside District. 



This district may be conveniently considered under the following 

 lieads : — (1) A western portion, comprising a considerable area 

 to the south of the Kent estuary and west of the Purness Eailway, 

 and also the small outlier of Meathop lying on the north side of 

 the estuary. (2) An eastern portion, lying wholly to the south 

 of the Kent estuary and east of the Purness Railway, treated 

 separately on account of the tectonic disturbances. (3) The 

 faulted inliers of Swantley and Halton Green, lying on 

 the southern margin of the district. 



In comparing this district with the type-districts, we may note : — 



1. The absence of the greater portion of the Solenopora Sub-zone, which is 

 only represented at Meathop by a few feet at the summit of the Camaro- 

 toechia-proava J3ancl, a fact which shows that this district was submerged at a 

 slightly later period than the type-districts. 



2. The development of a special coral fauna in the Seminula-gregaria Sub- 

 zone at Meathop. 



3. The great importance of the upper portion of the Michelinia Zone, which 

 at Arnside attains its fullest development in the Korth- Western Province. 



4. The great thickness of the middle and upper portions of the 

 Q/W2/?a-c«r6o««rm Sub-zone and the Bryozoa Band of the type-districts: the 

 latter being apparently replaced by the Chonctes-pajnlionacea Beds which occur 

 near the summit. 



