386 C. D. Walcott — Position of the Olenellus Fauna. 



Table showing the order of succession of the Cambrian faunas in typical areas in 



America. ' 







Newfound- 

 land. 



Massachu- 

 setts. 



New York. 



Tennessee. 



Nevada and 

 Utah. 



Upper Mis- 

 sissippi Val- 

 ley. 



2 



OQ 



< 

 1— I 



- 



pq 



< 

 o 



g 3 



Ulenus 

 zones. 



Unknown. 



Dicello- 



cephalus 

 zones. 



Present. 



Dicello- 

 cephalus 



zones. 



Dicello- 



cephalus 

 zones. 



H 5 



P « 



Paradox- 

 ides zones. 



Paradox- 

 ides zones. 



Indicated 

 by other 

 genera than 

 Paradox- 

 ides. 



Same as 

 in Nevada 

 and Utah. 



Repre- 

 sented by 

 other genera 

 than Para- 

 doxides. 



Unknown. 





*5 



5 S 

 o 



Olenellus 

 zones. 



Olenellus 

 zones. 



Olenellus 

 zones. 



Unknown. 



Olenellus 



zones. 



Unknown. 



The details of this table will be described in a future paper. 



The succession of the Cambrian faunas in Europe is the same 

 as on the Atlantic basin side of North America, as shown in 

 the following table : 



Table showing the order of succession of the Cambrian faunas in 

 Europe, where the Olenellus zone has been recognized. The local 

 sections are given in Dr. Lapworth's paper.* 







Scandinavia. 



Russia. 



Britain. 



Sardinia. 



3 



53 

 E-i 

 in 



Upper Cambrian 



or 



Olenus zones. 



Dictyonema 



and 

 Olenus zones. 



Dictyonema. 



Dictyonema 



and 



Olenus zones. 



? 



02 



< 

 1— 1 

 PC 



PQ 

 3 



Middle Cambrian 



or 

 Paradoxides zones 



Paradoxides 

 zones. 



Unknown. 



Paradoxides 

 zones. 



? 



< 

 O 



Lower Cambrian 



or 

 Olenellus zones'. 



Olenellus 

 zones. 



Olenellus 

 zones. 



Olenellus 

 zones. 



Types of the 

 Olenellus 



fauna, but not 

 Olenellus. 



* Nature, vol. xxxix, 1888, p. 213. 



