272 



Yorkshire Naturalists at PocJzIington, 



was found. The failure to find them proved nothing-, for the 

 time at the disposal of the party was limited, and they could 

 easily have been missed in the bed of the beck. But when we 

 review the evidence on which they were mapped it must be said 

 that it would not be thought convincing- to-day, and it should 

 be noted that the officers of the Geological Survey, in their 

 recent revision of the South Wales Coalfield, have removed the 



Photo by. \H. E. Wroot. 



Fau!t in the Keuper Marls near Pockiington. 



* tea green marls' of classic fame from the Rha^tics and include 

 them with the Upper Keuper, taking the strata in which Avicula 

 contorta makes its appearance as the base of the Rha^tics. 

 While not going so far as to say tliat there are no Rhjetic 

 beds at Pockiington it would certainly appear that the section 

 depended upon for the mapping have a decided Upper Keuper 

 or Lower Lias aspect, while the absence, so far as is known, of 



Naturalis 



