Vol. 59.] 



SOUTH DEVON AND THE MIDLANDS. 



327 



affect general conclusions. Indeed, in practice, it is not difficult to 

 recognize a typical Bunter pebble wherever it may be found. There 

 is consequently little fear of serious error in admitting the evidence 

 derived from fossiliferous pebbles found in the Drift, if there be no 

 special reason for suspecting that they were not derived from the 

 Bunter. 



The following table is compiled from the published lists of Salter, 

 Davidson, G. de Tromelin, Brodie, and others. Most of the specimens 

 will be found in the Museum of Practical Geology, Jermvn Street : — 



Drift. 



Homalonotus Brongniarti 



H. Vicaryi 



Calymene Tristani , 



Orthis budleighensis 



0. Berthoisi, var. erratica 



0. Valpyana 



Lingula Lesueicri 



L. HawJcei 



Sp infer a Verneuilii 



Stricklavdinia lirata 



1 Bhynchonella sp 



; Area Naranjoana 



; Clidophorus amygdalus ., 



' Modiolopsis lirata 



I Trachy (derma serrata 



Palcearca secunda , 



Petraia bina 



Lyrodesma sp 



Glyptocrinus sp 



Ort hoc eras sp 



BuDLEIGH 



Salterton. 



Normandy. 



* 



* 



X 



X 



■X 



X 



X 



-X 



* 



X 



X 



X 



-X 



X 



-X 



X 



X 



X 



■X 



-X 



* 



# 



* 



X 



•X 



•X 



X 



X 



I have omitted from the foregoing list some doubtful forms, and 

 it has no pretence to being absolutely complete. Other species 

 may have been found, or will, I hope, come to light. But the work 

 is slow, life is short ; the pebbles are proverbially hard and tough ; 

 and the fossils, when found, are often difficult to determine. 

 Nevertheless, the list tells its own tale clearly enough. All the 

 most characteristic fossils of the Budleigh-Salterton pebbles are 

 found in the gravels which have been obviously derived in part 

 from the Bunter Conglomerate of the Midlands. Whence did the 

 Bunter get these pebbles? Anyone has merely to look at a group 

 of characteristic Caradoc fossils from Wales or Shropshire, or the 

 Scottish area, to see that our fossiliferous pebbles of that age could 

 not have come from either of those directions. 



The hypothesis which presents the least difficulty appears to be that 

 which regards the two pebbly deposits, north and south, as having 

 had approximately a common origin. 



There is no doubt, at present, a certain amount of discontinuity 

 between the two areas ; but it is possible to exaggerate that. The 



