484 Canadian Record of Science. 
In Norway the Cambrian system has the following 
thickness’ :— 
Ratio. 
Stage 3a—Tremadoc or Ceratopyge fauna...,.....- 45 feet.. 1.2 
«¢  2d-e=Dolgelly or Pelturafauna.............. AQ os aleO 
“  2a-c=Lower Lingula flags, Olenus fauna ....110 “ .. 3.2 
“ 1c-d=Menevian and Solva, Paradoxides fauna. 80 “ .. 2.3 
“ la-b=Harlech (?) or Olenellus fauna......... 80S sae 
355 feet. 10.0 
In Wales there are the following groups of Cambrian 
strata :— 
Ratio. 
( Tremadoc 1000 feet, ile 
Upper 4 Dolgelly 600 “ a3) 
Cambrian. Ffestiniog 2000 “ \ 
Maentwrog 2500 “ 4.5 
Tower Saas sce “4 } 2.5 
Cambrian. aera aly 
Caerfai 1500 “ 1.5. 
10,100 “ 10.0 
In Acadia the Cambrian sediments are intermediate in 
thickness between those of Wales and Norway. The aver- 
age of two sections in the city of St. John gives the follow- 
ing proportions :— 
Ratio 
Division 3=Dolgelly (and Tremadoc)........ 600 feet ?.....0. 2.5 
“ _ 2=Ffestiniog and Maentwrog....... L050 S vaeretaneer 4.0 
“ _ 1=Menevian and Solva...........+. SOO 8 aeerev state 1.5 
peries)/A—Caertal (?)iele eal ceciee ee eiies omer HU  sorondac 2.0 
2500 10.0 
In Newfoundland Mr. Walcott has found the Olenellus 
beds to be about 600 feet thick and the Paradoxides beds 
370 feet, which agrees nearly with the thickness of these 
portions of the Cambrian system at St. John (New Bruns- 
wick). 
The Olenus fauna is found in Newfoundland, but appa- 
rently Mr. Walcott has not discovered there the fourth 
' Die Silurischen Etagen 2 und 3. 
” Above this is a thin body of slates with Arenig graptolites. 
