To face p. 505.] 



[. SYNOPSIS OP TOE LlTHOLOGICAL SEQUENCE IN DIFFERENT PaKTS OK GowEK. 



[Quart. Journ. Geol. Soc, Nov. 1911. 



go 



North-Western District. 



Le ,„ n„. BaBtern district, apparently 



D. :— Limestones. 



Much as in the Eastern distr 

 without dolomite. 



. MoMola l'linsc:— Calcite-mudston 

 ' pisolites ' : standard limestone 



. Chiefly light - coloured oolites: 

 dolomite known. 



lather dark limestones, with a r 

 calcito- or dolomite-mudslnne 



1 eonleinnnrancous ' dolomite : 



2. Similar to Sj, but without muds 



or dolomite. 

 1. Modiola Phase;— Much as in 



Eastern district. 



- Probably 



At most sun lr 



4-0 feet. 

 100 feet. 



Similar to the Laminosa Dolomites. | I About 520 feet 



Much as in Hie Eastern district 

 Not recognized. 



Eower Limestone Shales : — 2-4. Grey 

 shales with thin limestones; I thick 

 oolitic limestone, probably between 

 K, and K, 



1. Modiola Phase, Km. Grey shales 

 witli ostracod-limestones ; liniestoue 

 »f "-tyre. ( ^^^^^^ 



Ui p p e : 



Between UlO and 50(1 feet. 



Eastern District. 



2. Chiefly dark, non-calcareous shales; •■ 



black sponge-cherts in the lower part. 

 1. tiailicihirii.ii cherts with shales; wavellite 



Thickness. 

 At least 1500 feet. 

 Probably less than 50 feet 



Black lias' :— soft- weathering, argillaceous 

 limestones and shales, with sponge-cherts and; lletwe 

 sonic dolomite ; wavellite near the top. 



175 &, 350 feet 



2. Much as in the South-Western district. 



1. Morliola Phase (wanting at Longland Hay): 



Chiefly calrite-mudstones ; dolomite. 



2. Caninia Oolite. 



1. Laminosa Dolomites ; few undoloniitiz 

 (crinoidul) limestones. 



Not recognized. 



Similar to the Laminosa Dolomites. 



Dolomites, with crinoidal limestones in the lower 

 part ; cherts towards the base. 



Crinoidal limestones. 



Shales, which i 



\ 70 to 160 feet. 



South- Western District. 



As in the Eastern district 



Much as in tin 

 intercalated, 

 stones. 



Much as m the Eastern district (coal not known 



1 &2. Chiefly light oolite with zoned sponge- 

 cherts near its hase ; sonic cherty gasteropod- 

 limestones below ; dolomite. 



2. Caninia Oolite. 



1. Laminosa Dolomites, the lower part half 



undolomitized ; occasional cherts. 

 Chiefly nodular, argillaceous limestones. 



nnestones with dolonii 

 part, to a liigher hoi 



cherts in the lowt 

 i than elsewhere i 



Lower Limestine Shales: — 2-4.. Little exposed, 

 but probably as in North-Western Gower. 



Modiola Phase, Km. Chiefly grey ostracod- 

 shales; a ijuartz-conglomerato. 



Thicku 

 Unknown. 



About 400 feet. 



130 to 160 feet. 

 140 to 200 feet. 



At least 530 feet. 



andstone. 



-J 



