107 



it cannot be utilized as an age factor, and the only other species elsewhere represented is 

 Thuya interrupta which belongs to the lower Miocene or Oligocene. It is clear, then, that 

 so far as the present information will warrant such conclusions, Coal brook must be regarded 

 as certainly Eocene, and probably Lignite Tertiary or Laramie, thus confirming in the main 

 the conclusions reached by Sir William Dawson. 



OMINECA RIVER. 



The flora of the Omineca river embraces the following : — 



Eliminated. 



Cret. Eocene, Miocene 1 



Lignite Tertiary. 



General distribution. 



Lig. Ter., L. Miocene. 



Lignite Tertiary. 



Eliminated. 



Cret., Lig. Ter., L. Miocene. 



Cret., Lig. Ter., L. Miocene, 



Lignite Tertiary. 



Both Arundo and Quercus may be eliminated from the list without further consideration, 

 and Populus arctica, being common to the entire Tertiary, may also be left out of account. 



Leguminosites arachioides was first observed by Sir William Dawson in the beds of the 

 Similkameen river, and to that extent it may be regarded as of Lower Miocene? age. 

 Lesquereux, however, who first described these peculiar fruits and assigned them with a 

 question to the genus Leguminosites, obtained his material from the Port Union beds of 

 Montana, as well as from the Denver group of Middle park, Colorado, and the Laramie of 

 Evanston, Wyoming. If then we leave out of account the Horsefly river, which we may 

 provisionally regard as Miocene in accordance with previous determinations, this species 

 must be regarded as decidedly Eocene, with a strong Laramie aspect. 



In Canada, Platanus haydenii has otherwise been found only in the Lignite Tertiary of 

 Porcupine creek and related localities. Within the limits of the United States it is also 

 wholly confined to the Lignite Tertiary. From this evidence we must regard it as a pro- 

 nounced Laramie type. 



Po'fiulus arctica has already been shown to be without special, stratigraphical value, but 

 if we were to add such evidence as it affords it would be seen that it occurs in five localities 

 in Canada, known to be Laramie, but to only one locality supposedly Miocene ; therefore it 

 would show a tendency toward an Eocene, rather than a Miocene horizon. 



Populus nehrascencis is known to only one other locality — Quilchena — which has been 

 regarded as Miocene. In the United States it is known exclusively to the Fort- Union and 

 Denver groups, from which its Laramie character becomes obvious. 



Populus speciosa is found nowhere else in Canada, but WarJ's original specimen was 

 obtained from the Fort Union group of Montana, which leaves no doubt as to its place in the 

 flora of the Lignite Tertiary. 



