﻿Yol. 6 I.] SEQUENCE IN THE BEISTOL AREA. 235 



Syrinc/othyris aff. laminosa is characteristic of the whole 

 Caninia-Zone, and is associated at one end of the zone with a 

 typical Tournaisian fauna, at the other with a typical Yisean 

 fauna. 



This horizon exhibits the same characteristics in the Tythering- 

 ton section, at Wickwar, and at Cromhall. 



(4) Brentry Hill, three quarters of a mile north of Westbury-on- 

 Trym. (Two quarries, one on the main road to the Passages, 

 the other on the branch road to Charlton.) 



The upper part of the Seminula-Zone and the base of the 

 Dibunophyllum-ZoiiQ are shown, as evidenced by : — 



Seminula ficoidea and 8. cf. ambigua 



(mut. S 2 ). 

 Productus aff. Cora. 



Productus aff. hemisphericus. 

 Orthotetes crenistria (mut. D) (rare). 

 Lithostrotion Martini and variants. 



These fossils abound throughout the lower and middle beds, indicating the 

 Upper Semimcla-Zone. 



The concretionary structure is splendidly shown in the upper- 

 most beds of this zone, and some layers almost exactly resemble 

 Cotham Marble. In the upper beds we find : — 



Alveolites septosa. 

 Cyathophyllum Murchisoni. 

 1 Syringopora cf. distans and S. cf. 

 geniculata. 



These fossils definitely indicate the #0-subzone 



1 Lithostrotion Martini (mut. towards 



L. affine). 

 1 Bibunophyllum and Bib. <p. 

 Clisiophyllum 6. 



(5) Blaize-Castle Wood, near Henbury. 



An exposure by the side of the Ehododendron Walk yielded 

 the following corals-: — 



Lithostrotion irregularc. 

 Lithostrotion Martini and mutation 



(cf. L. affine). 

 Lonsdalia jloriformis var. (cf. L. ru- 



Syringopora cf. distans. 

 Cyathophyllum Murchisoni var. 

 Axophyllum 6. 

 Productus ' giganteus.' 



Mr. S. GL Perceval informs me that he has also found here : — 



Lithostrotion ensifer, j and 



Lithostrotion junceum, j Cyathophyllum regium. 



The position of the beds is thus completely fixed in the Lons- 

 dalia-Sxibzone. 



(6) Henbury Hill. 



A little south of Blaize-Castle Wood, west of the Westbury 

 and Henbury road, there is a quarry in Upper Seminnla-Beds. 

 The usual fossils are found, and many of the beds are oolitic. 



1 These fossils are included, on the evidence of localized specimens in the 

 Olifton-College Museum. 



