226 PROF. S. H. REYNOLDS ON A SILURIAN [May I907, 



From Sunnyhill Quarry to near Tadhill Farm, a distance not 

 far short of a mile, there is no clear evidence of the occurrence of 

 normal tuff. Debris, it is true, was found at the corner of the 

 field about 300 yards south-east of Moon's-Hill Quarry, but was 

 associated with trap-debris, and both may have been derived from 

 the weathering of the coarse ashy conglomerate. 



In a field near the eastern corner of Walltyning Plantation, about 

 300 yards south-south-west of Tadhill Farm, fragments thrown 

 out by moles and rabbits were found to consist of fine tuff contain- 

 ing Silurian fossils. Further search in the neighbouring hedge- 

 banks and ditches yielded blocks from which some twenty varieties 

 of Silurian fossils, identified by Mr. F. R. Cowper Reed, were ob- 

 tained. Finally, a trench was dug to a depth of about 6 feet ; this, 

 after passing through some 18 inches of surface-material, entered a 

 deposit consisting mainly of very fine yellow-and-brown ash, with 

 subordinate bands of coarser ash. Many of the bands were crowded 

 with fossils of the same species as those that had been obtained 

 from the surface-blocks, and a further series of some fifteen 

 forms was obtained. The dip of the deposit was by no means 

 obvious, but Dr. Strahan agreed with me in thinking that it was at a 

 high angle — 50° to 60°, and in a north-westerly or a north-north- 

 westerly direction : that is, the strike coincided with that of the 

 igneous band as a whole. Both in its lithological character and 

 in its fossil contents the deposit shows a considerable resemblance 

 to Band 1 in the Sunnyhill section. 



Farther east, normal tuff-debris has been met with at four spots 

 indicated in the map (fig. 1, p. 220), and at one of them, in a field 

 south of Downhead Quarry, Orthis elegantula and Rhynchonella 

 Davidsoni were obtained from material thrown out by moles. 



The following fossils from Tadhill have been identified by 

 Mr. F. R. Cowper Reed : — 



ACTINOZOA. 



Lindstroemia subduplicata, M'Coy. I Favosites sp. 



Lindstroemia elongata, Phill. | Monticuliporoid (indeterminable). 



Orinoidea. 

 Pieces of stem. 



Annelida. 



Cornulites serpularius, Schloth. | Teniaculites anglicas, Salt. 



Crustacea. 



Primitia sp. j Acidaspis sp. 



Beyrichia Kloedeui, M'Coy. ! Encrinurus (?) sp. 



Pkacops Dow)iingi(B,M.urch. (common). Cheirurus (?) sp. 



Phacops Stokesi, M.-Edw. : Lichas sp. 



Dalmanites caudatus, Brunn. Calymene Blmnenbachi, Brongn. 



