55 



ORIENTATION of Brachiopods on 10 small slabs from the Assise E. 3 e. Oriented 



fossilsiriE.Se. 



The rock in which these fossils occur is gray and of fine texture and 

 show a strong tendency to split along certain lines which are the 

 layers where fossils are most abundant, and where the surfaces are 

 lavishly strewn with little shells. 



Finding such marked orientation in the valves of Assize E. 3 e, 

 it was thought desirable to see if other horizons of the Etcheminian 

 presented similar conditions and at another locality, so a test was 

 made of some small slabs from the Assize E. 1 d on Boundary brook. 

 The following table gives the result: 



