How is the Caf/ilfvian divided? — Matt/iew. 130 
gave opportunity for the elements with which he had so often 
toyed, to blot his name, too early, from the list of America's 
most distinguished devotees of science. 
HOW IS THE CAMBRIAN DIVIDED?— A PLEA FOR THE 
CLASSIFICATION OF SALTER & HICKS. 
By G. F. Matthew. 
A new classification of the Cambrian system has lately been 
proposed by Mr. C. D. Walcott, the well known palaeontologist 
of the United States Geological Survey and has received the 
assent of Prof. Chas. Lapworth. The most prominent feature 
of this classiiication is the basal position given to the Olenel- 
lus fauna which no doubt is in accordance with facts. Another 
point in this classification is the placing of the rocks contain- 
ing the Paradoxides fauna as Middle Cambrian ; with this the 
knowledge at present before the writer does not seem to agree. 
A while ago it seemed as though the Cambrian system was 
divided palaeontologically into three sections, the Paradoxides 
beds, the Lingula flags and the Tremadoc or Ceratopyge beds, 
which would thus be the Lo .vcr. Middle and Upper Cambrian. 
But this "Upper" Cambrian was not only weak in bulk of 
measures, but in the genera it contained it exhibited a strong 
pala^ontological affinity to the Ordovician forms, so strong, 
indeed that by many European geologists it was classed as a 
part of the "Lower Silurian*' system. 
The discovery by Mr. Walcott of many of these so-called 
Ordovician forms, low down in the Cambrian strata of the 
Rocky mountain region, shows that a different interpretation 
may now be given to these forms, for they do not by their 
presence exclude the Ceratopyge or Tremadoc beds from the 
Cambrian. Nevertheless, under the classification proposed 
by Messrs. Salter and Hicks some twenty years ago, the 
Cambrian is divided into two great divisions only. 
The purpose of the present article is to review some of 
the evidence touching the faunas and the sedimentation of 
this system, and to compare the proposed division with that 
presented by Messrs. Salter and Hicks. 
Late discoveries in America and Europe and especially the 
enlargement of tlie fauna with Olenellus and the discovery, or 
rather the determination of its proper place in the Cambrian 
