56 



Oriented 

 Lingulepides 

 in Assise E. 1 

 d, Boundary 

 brook. 



ORIENTATION in eleven small slabs showing Brachiopods from 

 Assise E. 1 d. at Boundary brook. 



Acrothyra 

 oriented in 

 Assize E. 1 c. 



Returning to Dugald brook I continued the examination of the 

 assises there. Four small slabs from the Assise E. 1 c did not show 

 such satisfactory results. The species here are Acrothyra signata, and 

 a few examples of an Obolus. The Acrothyrse, unlike those of Assise 

 E. 3 e, do not lend themselves to orientation. Many are in a vertical 

 or nearly vertical position (in relation to the layers of rock) and not 

 thrown on their sides like those of the horizon last named. 



ORIENTATION in Assise E. 1 c. at Dugald brook. 



These and the following table give the best examples of orientation 

 in the Lower Etcheminian, but in others of these lower assises it was 

 not at all well marked. Taken collectively the assises of the Lower 

 Etcheminian do not exhibit by any means so clear an exemplification 

 of the phenomina of orientation as those of the Upper Etcheminian. 



