74 



STRATIGRAPHICAL GEOLOGY 



' 



Fig. 11. GROUP OF LOWER CAMBRIAN FOSSILS. 



1. ", b. Obolella Groomi (enlarged). 

 2. The same (shell highly enlarged). 



<;. Olenellus Callavei (reduced). 

 i/. Kutorgina cingulata (enlarged). 



Fig. 12. GROUP OF IRISH CAMBRIAN FOSSILS. 



a. Oldhamia antiqita. c. Histiodenna hiberuicum. 



b. Oldhamia radiata. e. Arenicolites didyma. 



