218 THE HIGHEST SILUEIAN OE THE LUDLOW DISTRICT. [May I906. 



appears to be due to the presence of sandy beds, which, are hardly 

 represented in the Tin-Mill Wood. 



Just below the lowest of a series of purplish sandstones the 

 ' Fragment-Bed ' may be found. Therefore we place all the beds of 

 the upper part of the section in the Old Red Sandstone, although, so 

 far as we can make out, Marston included them in his ' Tin-Mill 

 Shales.' 



(c) Norton. 



Additional confirmatory sections are visible in the tracks leading 

 from Norton-Camp Wood to Norton, known as Rotting Lane and 

 Camp Lane respectively. 



The Aymestry Limestones (A) have been extensively quarried in 

 Norton-Camp Wood ; they yield their characteristic assemblage of 

 fossils, although Conchidium (Pentamerus) Kniglitii is perhaps not 

 so abundant as at some other localities, and Atrypa reticularis rather 

 more so. The Mocktree Shales (B) are seen at various points im- 

 mediately east of the Wood, and the Lower Whitcliffe Flags (C) come 

 on quickly above them, and are well seen in Rotting Lane with the 

 Concretion-Band (C b) which marks their upward termination. The 

 Upper Whitcliffe Flags (D) are seen in continuous section along 

 both tracks, dipping 6° eastward, the Spirifera-elevata Beds coming 

 on just before the main road is reached. The Ludlow Bone-Bed (D c) 

 is exposed in the orchard behind the red cottage, a few yards to 

 the north. It is better developed here than anywhere else in the 

 district, being both thicker and richer in organic remains than in 

 other localities known to us. The Platyschisma-~Bed (E b) occurs 

 above it, with only 2 feet of mottled sandstone intervening. 



The massive sandstones (E c) have been quarried behind Norton 

 Farm, and are there seen with the carbonaceous beds (E d) resting 

 upon them. The outcrops of the highest members of the Downton- 

 Castle Sandstones and all the Temeside Shales are concealed by 



YI. Conclusions. 



We hope to have shown in the foregoing pages that the highest 

 Silurian rocks are capable of more detailed subdivision than has 

 been hitherto believed. It remains, however, to be proved whether 

 the classification that we have adopted is of more than local value, 

 although from the observations of one of us in other areas we have 

 some reason to hope that this will prove to be the case. 



The mapping of our zones has also, we think, indicated in 

 various places the presence of faults which have remained hitherto 

 undetected. 



In conclusion, we ofTer our grateful thanks to Prof. Hughes for 

 facilitating our work in every way ; to Dr. Marr for his advice and 

 encouragement ; and to all the other members of the Cambridge 

 School, with whom various points have been freely discussed. We 

 would also wish to record our gratitude to Mr. Charles Fortey, the 

 honorary Curator of the Ludlow Museum, for his unfailing courtesy 

 to us during our visits to that town. 



