228 



PEOF. S. H. REYNOLDS ON A SILURIAN [May I907, 



opportunities for observation go, is very uniform in character, 

 consists of a fine-grained ashy matrix similar to that of the normal 

 tuffs of the district, but embedded in this are blocks and pieces of 

 rock, large and small, ranging in length up to as much as 18 inches. 

 The great majority of the blocks consist of the local trap, and are 

 thoroughly well-rounded : although, as shown in fig. 4, a certain 

 proportion, especially of the larger blocks, are subangular. No sign 

 of bedding could be detected, the blocks large and small being 

 jumbled together in a most irregular manner. A few pebbles of 

 quartzite and of micaceous grit or sandstone occur, in addition to 

 the trap-pebbles. Mr. Cowper Reed noticed that the smaller trap- 

 fragments were in various stages of weathering before they were 



Fig. 4. — View of part of the new quarry in the coarse ashy conglo- 

 merate, south-east of Moon's Hill, Stoke Lane, showing the 

 subangular character of some of the blocks. 



embedded in the matrix. Irregular patches of a fine argillaceous 

 tuff occur in the ashy conglomerate, and these were unsuccessfully 

 searched for fossils. 



This quarry, although the best, is not the only exposure of the 

 coarse ashy conglomerate. If one passes to the east, coarse 

 conglomerate of identically the same type occurs in situ by a little 

 pond just south of the road, and midway between Walltyning 

 Cottage and Tadhill Farm, and blocks of the same rock were met 

 with at three points in the fields north of the road. At all 

 these points blocks of a fine-grained pale-green tuff occurred; but, 

 in the main, the material consisted of a matrix of small angular 



