6 SKETCH OF THE GEOLOGICAL HISTORY OP THE BRISTOL DISTRICT. 
development of Wenlock rocks, including two bands of limestone, 
which, though they have yielded numerous fossils at certain localities, 
contain a somewhat meagre fauna as compared with that of the Silurian 
inliers further to the north. The Ludlow rocks of the southern part of 
the area in the neighbourhood of Tortworth are thin and poorly exposed, 
and do not show the normal development met with in Herefordshire 
and Shropshire. At Lite’s Point (Purton Passage) on the Severn, 
however, there is a more normal development of the Ludlow rocks, 
with a representative of the Ludlow bone bed. 
Fig. 1. 
Reproduced by kind permission of the Council of the Geologist^ 
Association of London. 
In the eastern Mendip area, in the neighbourhood of Downhead and 
Stoke Lane, the principal development of Silurian rocks is a thick mass 
