Classification of Cambrian Rocks. 303 
ON THE CLASSIFICATION OF THE CAMBRIAN Rocks 
IN ACADIA. 
No. 2. 
By G. F. MattTuew, M.A., F.R.S.C. 
1. Comparison of Species with Description of a new Species 
of Obolus. 
When in Vol. III, No. 2, of this journal, the writer sug- 
gested a provisional arrangement of the members of the 
Cambrian System in Acadia, he did not anticipate that the 
doubt then resting upon the proper position of the Olenel- 
lus beds, (or Georgian Series), would so soon be removed. 
Karly in the past summer, he received from Dr. F. 
Schmidt, of St. Petersburg, his pamphlet “On a newly 
discovered, Lower Cambrian fauna in Hastland,’’ wherein is 
‘described, under the name of Olenellus Mickwitzi, a trilo- 
bite in all respects similar, in generic characters, to Mr. C. 
D, Walcott’s Mesonacis. This trilobite is found in company 
with Mickwitzia monilifera (=Lingula (?) monilifera, Linrs.) 
a brachiopod of the Kophyton Sandstone. The Eophyton 
Sandstone is at the base of the Cambrian System in Swe- 
den, below the Paradoxides bed, and this trilobite (O. Mick- 
witzi), therefore, is of greater antiquity than Paradoxides. 
This view of the comparative age of the Paradoxides beds 
is supported by the discovery (communicated to me by 
Mr. Walcott) of Ollenelus (?) Kjerulfi in the Cambrian 
beds of the State of New York. Thisspecies is well-known 
as being below the Paradoxides beds in Europe. 
So there was, in the discovery of these two species in 
the situations designated, sufficient evidence to show that 
the Olenellus beds, or those containing the Georgian fauna, 
were below the Paradoxides, and not above, as I suggested 
in my former paper to be the more probable alternative. 
Mr. Walcott has since made the position of these beds cer- 
tain by visiting Newfoundland, and examining the district 
where, many years ago, Mr. A. Murray found the Georgian 
