384 



MISS G. L. ELLES ON THE WEDLOCK 



[May 1900, 



Above this belt of flagstones come a series of dark shales without 

 concretions, in which fossils are very abundant. These include forms 

 of Monograptus colonus, M. bohemicus (Barr.), M. Nilssoni (Barr.), 

 etc., and therefore the beds must be regarded as belonging undoubtedly 

 to the Lower Ludlow. 



Exposures are numerous in the upper parts of the river, but 

 consist merely of repetitions of the beds just described. They need 

 not, therefore, be dealt with in detail, since they present no new 

 features. Sections confirming the upper part of the Irfon section 

 are also to be seen in the road leading past the Cottage Hospital, 

 and again in that leading past the Vicarage ; in both these the beds 

 yield a typical Lower Ludlow fauna, and hence the Ludlow rocks 

 should be represented on the map very much nearer to the town 

 of Builth than they are at present. 



Table II. 



BIVEE IKFOBT GRAPTOLITES. 



S 



!§> 



O CO 



f 

 l 



Zone of 

 Cyrtograptus Lundgreni. 



Names of Species and 

 Varieties. 



[C = very common ; c = common ; r = 

 somewhat rare ; R = very rare.] 



A 



B 



c 



D 



E 



F 



G 



H 



I 



Locality Nos. (See Map, fig. 1, p. 381.) 



14 



14 a 



14 6 



13 v 13 w 



13 x 



13 y 



13 z 



ISa-d 



Monograptus vomerinus (Nich.) var. a 

 M. basilieus, Lapw 



C 

 C 

 C 

 C 

 c 

 r 



C 

 C 



c 



C 



c 



c 



c 



C 



c 



R 



C 



C 



c 

 c 



C 



C 



c 



c 



C 



c 



c 



C 



c 

 c 



c 

 c 

 c 



c 



C 



c 



M. duhius, Suess 



Ci/rtograptus riqidus, Tullb 



Monograptus Flemingii (Salt.) var. a 

 » „ var. Q 

 » „ var. 7 

 „ „ var. <* 



Ci/rtograptus Lundgreni, Tullb 



Monograptus irfonensis, sp. nov 



(c) Aberedw Hill. 



East of Builth the only zone exposed is that of Cyrtograptus 

 Lundgreni. The beds belonging to this horizon, are seen on the 

 Presteign road just above Cinthio Sawmill (see map, fig. 4, p. 385), 

 on the road that leads past the sawmill, just after it has crossed 

 Cinthio Brook, and in the brook itself for a short distance. The beds 

 consist of hard calcareous shales and flagstones with limestone- 

 concretions, and are exposed near the sawmill for a thickness of 

 12 feet. They dip 15° in a direction E. 30° S., and have yielded the 

 fauna enumerated in Table I, col. N (p. 378). 





