Yol. 62.] HIGHEST SILURIAN ROCKS OF THE LUDLOW DISTRICT. 205 



overlying grit-bed (F 6), which is conspicuously ' bony ' at its lower 

 and upper limits, is here seen at its maximum development (2 feet), 

 but, like the other Bone-Beds of this Series, it thins away rapidly to 

 west and east. Traced westward it almost disappears in the space 

 of a few yards, while traced eastward it diminishes more gradually 

 in thickness, its place being taken by olive shales ; so that, close 

 to the footbridge, the grit is only 7 inches thick, the lower of the 

 two ' bony ' layers has disappeared, and the upper is present as a 

 thin band in the olive shales (Fc & F e). This Bone-Bed (F d), 

 which we designate the Temeside Bone-Bed so as to distinguish 

 it from others at different horizons, is a characteristic feature of the 

 Temeside Shales at this locality, and may be regarded as a grey 

 micaceous grit, in which large fragments of bone and fish-spines are 

 disseminated. There is, in addition, a considerable amount of car- 

 bonaceous matter, but whether of vegetable or animal origin is not 

 clear. As a whole, this Temeside Bone-Bed is coarser and more 

 diffuse than the Ludlow Bone-Bed, and very different from the latter 

 in general appearance. 



The succeeding olive shales (F e) are 2 to 4 feet thick. Eurypterid- 

 remains are abundant, but the majority are too imperfect for determi- 

 nation ; these are succeeded by another grey micaceous grit (1 foot), 

 J?f, at the top of which occurs a well-marked layer crowded with 

 carbonaceous fragments, but in which bones are rare. Purple-red 

 sandstones with shaly partings come on immediately above this 

 * Fragment-Bed' : these differ in general lithology from anything that 

 we have seen at a lower horizon; and since the ' Fragment-Bed' at 

 their base appears fairly constant over wide areas and is easily 

 recognizable, we suggest its adoption as the upper limit 

 of the Silurian System in this district. 



On the left bank of the Teme at Ludlow the only rocks now 

 visible are the beds of the Upper Whitcliffe Flags (D), which are 

 well exposed below the Castle. There is, however, a record that 

 the Temeside Shales were exposed in Old Street, when drainage 

 operations were in progress. 



(b) Wigmore Road. 



The Aymestry and Upper Ludlow Groups are again well exposed 

 in Whitcliffe Wood, in a series of small quarries on the east side of 

 the main Wigmore Road. The beds dip northward at angles varying 

 from 10° to 20°. Starting from Mary-Knowl Farm, where the highest 

 members of the Lower Ludlow rocks are seen, the Aymestry Lime- 

 stones (A) are exposed discontinuously along the road for about 

 600 yards. The beds show their characteristic honeycomb' weather- 

 ing, and yield their distinctive fauna. The outcrop of the succeeding 

 Mocktree Shales (B) extends over a distance of about 220 yards, 

 where they give place to the Lower Whitcliffe Flags (C). These are 

 seen at intervals down the hill for the next 700 yards, their junction 

 with the Upper Whitcliffe Flags (D) being marked, as usual, by the 



Q. J. G. S. No. 246. q 



