420 THE CAMBRIAN. [bull. 81. 



paleontologist must be ready to admit that very different fossil faunae may be con- 

 temporaneous, aud that their difference does not necessarily imply a distinct zoolog- 

 ical age. 1 



When discussing the typical forms and the distribution of the rocks 

 of the Cambrian, Mr. J. J. Bigsby presents a table showing the order 

 of succession of the Cambrian rocks in various countries. 2 In this he 

 includes the Upper Cambrian sandstones of Texas aud Nebraska, and 

 they are referred to the upper or Primordial division of the Cambrian. 



Matthew. — During the progress of his extended researches in the 

 faunas and rocks of the Cambrian system in New Brunswick, Mr. G. 

 F. Matthew has had frequent occasion to compare the stratigraphic 

 succession and the fauuas of the Cambrian of New Brunswick with 

 that of Europe. 



In a paper read before the British Association for the Advancement 

 of Science in 1884, he correlates the fauna of the St. John group of 

 New Brunswick with that of the Cambrian of Wales, and concludes 

 that it shows closer relations with the Solva group thau with the Me- 

 nevian. 3 



Near the close of the same year he stated in a paper read before the 

 Natural History Society of New Brunswick that the discover of a 

 higher fauna enabled him to correlate the beds containing it with the 

 Meuevian group of Wales. 4 



In an essay on the classification of the Cambrian rocks in Acadia, 5 

 Mr. Matthew considers that the Potsdam sandstone is equivalent to 

 the Ceratopyge limestone, or the Tremadoc group, and represents the 

 upper part of the Tremadoc, as the Georgian series probably does the 

 lower. This correlation is made upon the interpretation of the charac- 

 ters of the genera of trilobites in the American and European rocks. 



A second paper on the classification of the Cambrian rocks in Acadia 

 appeared in 1889, in which a comparison of sectious in Sweden and 

 New Brunswick with the characteristic sectious of Cambrian rocks in 

 Europe and in North America is made. 6 In the comparison of sections 

 of Sweden and New Brunswick the base of the Paradoxides beds is taken 

 as the datum point and it is shown that the pre-Paradoxides horizon is 

 present both in Sweden and New Brunswick, and that the Upper Cam- 

 brian or Olenus horizon is represented in New Brunswick by Stage 2 

 of the St. John County section and by the same stage in Sweden. In 

 the second table of the sections of the Cambrian rocks in Europe and in 

 North America, the correlations made between the sections of Sweden 

 and New Brunswick are accurate and valuable; but those between the 



1 On the difference between faunas of zoological and geological periods. Boston Soc. Nat. Hist., 

 Proc, vol.8, 1862, p. 58. 



2 On the Cambrian and Huronian formations. Geol. Soc. Quart. Jour., London, vol. 19, 1863, p. 44. 

 3 The geological age of the Acadian fauna. Brit Ass. Adv. Sci., Rep. 54th meotiug, 1881, pp. 742, 743. 

 4 An outline of recent discoveries in the St. John group. Nat. Hist. Soc. N. B., Bull , No. 4, 1885, 



p. 101. 

 6 Canad. Rec. Sci., vol. 3, 1888, pp. 79, 80 . 

 6 Canad. Rec. Sci., vol. 3, 1889, pp. 308-311. 



