Vol. 68.] SUCCESSION IN THE NORTH-WEST OF ENGLAND. 



513^ 



that on Trowbarrow the fold has aiFected the beds of the Lower 

 Dihunophyllmn Sub-zone, and the MicJielinia Beds do not again^ 

 appear at the surface. 



The Productus-corrugato-liemispliericus Zone crops out 

 to the east of the MicJielinia Beds, the beds being also reversed 

 along the north-and-south line of disturbance. The Nemato- 

 pliyllum-miaus Beds are well exposed in Sandside Quarry, where, 

 they occur in the dome-shaped fold already mentioned. 



The Lower Dihiinophyllum Sub-zone comes on at the- 

 summit of Sandside Quarry, where the beds show distinct traces- 

 of horizontal movement ; they form the highest ground between^ 

 Sandside and Hale, and in many places the pseudo-breccia beds- 

 constituting the summit of the sub-zone are well exposed. Farther 

 south-west the beds of this sub-zone come under the influence^ 

 of the north-and-south line of disturbance, and on Trowbarrow 

 Hill they are tilted into a vertical position. The massive lime- 

 stones here include a band of calcareous shale 16 feet thick, which, 

 being more readily denuded than the limestones, is marked along 

 the summit of the ridge by a trough-like depression, a feature 

 whence the hill doubtless derived it name. Both the shale and 

 the limestone are now well exposed in the quarry (PI. XLY, lig. 1 ,. 

 facing p. 512). The horizon of these beds appears to lie near 

 the summit of the Lower Dibiuioj)Tiyllum Sub-zone, and the limestone 

 includes beds of the ' spotted ' rock characteristic of this horizon. 

 The limestone is much hardened and recrystallized, and fossils 

 are difficult to identifj'. Specimens of LitJiosti^otion cf. portlocki^ 

 Dihunophyllum and Productus cf. maximus have, however, been 

 collected from the bedding-planes exposed on the eastern face of 

 the quarry. The shale-bed, which is a concretionary calcareous 

 mudstone, contains a fair number of fossils, but many of these (and 

 especially the corals) are much compressed. The following species - 

 have been collected from this shale-bed : — 



Aulophyllum cf. pachyendothecum 



Thomson. 

 Caninoid Campophylhim. 

 Carcinophyllum Vaughan. 

 Clisiophyllitiii aff. keyserlinyi M'Coy. 

 CyatJiophyUum murchhoni Ed. & H. 

 Dihunophyllum <p Vaughan. 

 Lopkopkyllum sp. 

 Liihostroiion cf. irreyulare (Phill.). 

 Lithostrotion junceum (Flem i n g) . 

 Lithostrotion m^coyammi Ed. & H. 



East side. 

 Lithostrotion cf. portlocki (Bronn). 



East side. 



Athyris planosulcaia (Phill.). 

 Chonetes compressa Sibly. 

 Chonetes hardrensis Phill. 

 Chonetes cf. intersiriata Dav. 

 Bielasma sp. 



Q. J. G. S. Ko. 272. 



Frodiictus eleyans M'Coy. 

 ProdMctus fimbriatus Sby. 

 Productus cf. latissimus Sby. 

 Productus cf. maximus M'Coy. 

 Productus semireticulatus Mart. 

 Eeticularia lineata (iVlart.).^ 

 Bhipidomella michelini (L'Eveille). 

 Spirifer hisulcatus Sby. 



Edmondia sulcata (Phill.). 

 Posidoniella sulcata Hind. 

 Posidoniella sp. 



Pterinopecten cf. riyidus (M'Coy). - 

 Sanyuinolites sp. 



Loxonema ruyiferum Phill. 



Orthoceras sp. 

 Vestinautilus sp. 



2p 



