Vol. 68.] SUCCESSION TN THE NORTH-WEST OE EN&LAND. 



503 



The band is much more argillaceous than is the case at Orton and 

 8hap, and consists of dark calcareous shale crowded with bryozoa 

 and Spiriferina laminosa. 



Localities. — Blue Quarries, Smardale Pell, Ash Pell. 



The Lower Dihi(no2)^iyUum Sub-zone is not ver}- typically 

 developed in this district. The base of the sub-zone is exposed 

 in Lane-Head Quarries. This horizon cannot lie far above the 

 highest bed seen in Blue Quarries. The beds here are rolling, 

 and it is difficult to estimate the exact thickness of the strata which 

 overlie the Bryozoa Band between Blue Quarries and the Midland 

 Eailway Station. They differ both lithologically and palaeonto- 

 logically from their normal development elsewhere, being much 

 more argillaceous than in the Shap District. jSlo specimens of 

 either CyatliophyUum murchisoni or Dihimopliyllum have been met 

 with"; but the abundance of crushed specimens of Productus cf. 

 maximus (M'Coy) and caninoid Campophyllids seems to point to 

 the correlation of these beds with the Lower Dihunopliyllum Sub-zone 

 elsewhere. The matter in itself is of no consequence, for we may 

 regard them as passage-beds between the two zones ; but it becomes 

 important when we consider the position of the overlying Daviesiella- 

 llangoUensls Band, to be mentioned presently. In Lane-Head 

 Quarries, on the west side of the Sedbergh road, the beds are fairly 

 fossiliferous, and contain abundant examples of the Proclucti and 

 crushed corals mentioned above, together with large Orthocerata 

 which are unknown from any other horizon in the district. 

 Species of Syringopora and Alveolites are also common. 

 Localities. — Lane-Head Quarries; Waitby Common. 



7) 



Fauna. 



Alveolites capillaris (Pbill.). 

 Alveolites etheridgi Thomson, 

 Aulopora sp. 

 (1) CoMinia. 



CyatJiophylhcm murchisoni Ed. & H. 

 Dibuno'phyllum Yaugban. 

 Lithostrotion junceiim (Fleui.). 

 Lithostrotion martini M.-Edw. 

 Syrivgojjora geniculata Phill. 

 Syringopora raimilosa Goldf. 



Chonetes papilionacea Phill . 

 Gyrtina carbonaria (M'Coy). 

 Orthotetes sp. 



Pr-oductus corrugato-hemisphericiis 



Vaughan. 

 Productus cf. onaxiimos M'Coy. 

 Productus punctatus Mart. 

 Beticularia sp. 

 Seminula amhigua (Sby.). 

 Sfirifer hisulcatus Sby. 



Samgidnolites sp. 



Straparolhis sp. 

 Bellerop)hon scalifer de Kon. 

 Bellerophon sp. 



Poterioceras cf. cordiforme Sby. 



The presence of Cyrtina carhonaria in the Lane -Head quarry on 

 the east side of the road marks the highest horizon at which this 

 species has been found, as these beds certainly lie above the 

 Bryozoa Band, whether we consider them as belonging to the base 

 of the Lower Dihunopliyllum Sub-zone or to the summit of the 

 Productus-corrugato-lieraispliericus Zon e. 



