Vol. 68.] SUCCESSION IN THE NOKTH-WEST OF ENGLAND. 53E 



with the other. These sections are of especial interest, since they 

 confirm the conclusion, already arrived at from a study of the Arnside- 

 and Kendal Districts : namely, that the hed containing the massive 

 form of Michelinia grandis, seen on Meathop Eell, underlies the- 

 higher beds of the zone with Clionetes carinata exposed on the 

 opposite shore at Arnside. In the Park-Head section the lower 

 portion of the zone is seen at low water in the neighbourhood of 

 Barker Scar, where it consists of about 20 feet of massive limestone 

 containing large specimens of Michelinia grandis. This is overlaiu 

 by dark limestones and calcareous mudstones, forming the upper- 

 portion of the Michelinia Zone, which crops out on the beach andl 

 also in a small cliff farther up the shore below the flagstaff. 



The mudstones contain identically the same fauna as that already 

 described from the Arnside Beds, and the section includes the- 

 Clisiophylliim-midtiseptatum Band at the summit. 



The Productus-corrugato -hemisphericus Zone. — Imme- 

 diately overlying this band comes a purple limestone with 

 Liihostrotion and Seminula aff. Jicoides, representing the lower 

 portion of the Pr.-corrugato-hemisphericus Zone; and these beds 

 are succeeded by the paler limestones containing JSfematophyllum 

 minus and Chonetes papilionacea, belonging to the upper portion 

 of the zone. The beds dip here at about 20° south-eastwards. 



On the east side of Ravenbarrow Point a small fault occurs^ 

 but a good exposure of the overlying beds of the Lower- 

 Dihunophyllum Sub- zone is seen a little farther east; and 

 these beds can be followed in a northerly direction to Old-Park 

 Farm, where the ' spotted ' beds, already mentioned as very 

 characteristic of this zone elsewhere, are found in the quarry in^ 

 Waitham Wood. 



Beds belonging to the Upper Dibunophyllum Sub-zone- 

 crop out in Holker Park, and consist of a series of sandstones and 

 thin bituminous limestones near Quarry Plat. These deposits appear 

 to approach the Kirkby Lonsdale type in character. 



The section near Frith Hall farther north is a continuation of 

 that just described. It is of interest, chiefly on account of the 

 exposure of the beds of the Camarophoria-isorhyncha Sub-zone andl 

 the evidence which it affords regarding their relation to the over- 

 lying beds of the upper portion of the zone, which are also well 

 exposed here. 



The lower beds are much indurated, recrystallized, and traversed' 

 by calcite-veins, indicating their proximity to a considerable dis- 

 turbance. The importance of this disturbance is further emphasized' 

 by the presence of a thrust-plane accompanied by a red crush- 

 breccia. This breccia is well seen in the cliffs a few feet above the- 

 shore, in several places in the neighbourhood of Hazelhurst Point. 



These evidences of movement are doubtless connected with the 

 disturbance which runs up the Leven estuary, one of the series of, 

 north-and-south faults previously mentioned. 



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