70 Prof. G. Delépine—Faunal Succession, Llantrisant. 
(Taff Vale Railway) and on the road from Llanharry to Ystradowen 
(exposure f) the following fossils occur in a massive oolite :— 
Lithostrotion. 
Carcinophyllum. 
Prod. corrugato-hemisphericus, mut. Sz. 
Seminula ficoides. 
(2) A large quarry and several small ones. 
Above. this oolite, in a very large quarry (exposure g) north of, 
and close to, Llanharry Station, a well: bedded blue and violet lime- 
stone is massively developed. 
Here the beds are poorly fossiliferous, but in another quarry 
(exposure /) where the upper beds are worked I collected— 
Carcinophylium @ and fragments of Campophyllum and Productus. 
In a quarry to the east of the last, near a chapel, on the other side 
of the Taff Vale line, a similar limestone occurs (exposure /). This 
yielded Productus hemisphericus, Chonetes sp., and Gasteropods. 
(3) Close to the village of Llanharry, on the left-hand side of the 
road from Bryn- Sadler, is an old quarry (exposure m) exhibiting 
thick beds of rubbly limestone. Here I collected— 
Lithostrotion irregulare. 
Dibunophylium 6. 
Productus near Martini. 
Seminula ficoides. 
Ila. Correlation of Limestone West of Llantrisant with Avonian Zones. 
D,.= Exposure m. 
D, =Exposure /, and perhaps top of large quarry (g). 
Dibunophyliun-zone 
Seminuia-zone. §,= Exposure f and bottom of large quarry (g). 
III. About one mile north of Ystradowen, on both the right and 
left of the main road from Llantrisant to Cowbridge, the beds dip in 
a south-easterly direction. 
A quarry on the right (exposure ») exhibits dolomite with 
erinoids; the base of the dolomite yielded— 
Syringothyris laminosa (abundant). 
Syr. cuspidata (common). 
Caninia cornucopia. 
A quarry on the left (exposure 2) exhibits, in ascending order— 
(1) Massive oolite. 
(2) Dolomite with crinoids. 
(3) Black limestone. 
The beds in (m) and (xz) resemble, both lithologically and 
palzontologically, the oolitic and dolomitic beds of exposure (¢), near 
Hendy Farm, which have been assigned to Cy. 
(GlOvyes BNE os 03 
Dibunophyllun-zone ; 1D. aie a tceeneey: 
Zonal Seminuta-zone { ©? e, f, bottom of 7. 
Sequence US. . Top of d. 
Oaitninenee. Cy 2). 3) 2) Bottom onde, 7a 
\ Base of C, (y) 2. 
Lapnrentis-200e)) se in nea 
