280 MISS G. I ELLES AND MISS E. M. K. WOOD ON THE [May 1 896, 



Monograptus Hiswgeri (Carr.). 



* crispus (Lapw.j. 



* cf. sartorius (Tullb.). 



* cf. speciosus (Tullb.). 



* runcinatus (Lapw.). 



* Monograptus pandus (Lapw.). 



lobiferus (M'Coy). 



* cf. nodifer (Tullb.). 



Diplograptus Hughesii (Nich.). 



Clvmacograptus normalis (Lapw.). 



It is this fauna which leads us to believe that the zone is a 

 passage-zone, as the fossils marked with an asterisk are characteristic 

 Tarannon forms, while the other species are common in the Llan- 

 dovery Beds. 



2. The Tarannon Shales. 



(a) Marsh-section. — Unfortunately the lowest beds of the 

 Tarannon Shales in this district are not very fossiliferous — at least 

 in places which are accessible, for much of the section is obscured 

 by buildings and lumber from the adjoining timber-yard. 



At the corner of the road, however, we succeeded in obtaining 

 two slabs on which were seen a number of badly preserved Mono- 

 graptids. Many of these were too obscure for identification, but we 

 have determined M. pandus (Lapw.), M. Hisingeri, var. nudus 

 (Lapw.), Cyrtograptus Lapworthi (Tullb.), and C. {l)spiralis (Gein.). 



These beds were almost immediately faulted out against the 

 Wenlock Shales. 



(b) Section opposite the Forge. — The section of Tarannon Shales 

 seen opposite the forge is by far the best in the district, and con- 

 tains a rich graptolitic fauna. It was from these beds that Prof. 

 Lapworth obtained the fossils recorded by him in his ' Distri- 

 bution of the Rhabdophora' (Ann. & Mag. Nat. Hist. 1880, ser. 5, 

 vols. v. & vi.). The strike of the beds does not appear to have 

 been affected by the fault, and they dip 10° W. of S. at a fairly 

 constant angle of about 55°. 



The beds consist of alternations of hard grey unfossiliferous flag- 

 stones, with softer black shale-bands containing graptolites. They 

 are quite different in character from the Llandovery rocks, and are 

 not so fissile. 



The following is the complete section seen ; the lowest beds occur 

 exactly at the corner by the forge, while higher beds come on along 

 the road in either direction : — -p t In 



13. Soil and loose shale 4 



12. Bands of hard grey flags, with softer seams. Unfossiliferous... 2 6 

 11. Black shale- band, with graptolites. Very ferruginous and 



deeply weathered 1 6 



10. Grey flagstones 9 



9. Black shale-band, with graptolites. Very soft, and stained 



yellow , 1 



8. Grey flagstones 9 



7. Soft black graptolitic shale 6 



6. Grey flags, with narrow band of hard yellow grit : all yery 



ferruginous 5 



5. Soft black shale, with graptolites 9 



4. Unfossiliferous grey flags 7 



3. Black shale, with graptolites 9£ 



2. Grey flags 1 



1. Grey, sandy, graptolitic band ; iron-stained above. 

 (Base not seen.) 



