88 FORTYMILE. BIRCH CREEK, AND FAIRBANKS PLACERS, [bull. 251. 
the Yukon silts, which have not been touched upon in this descrip- 
tion. There was a time, too, when volcanic dust from some distant 
source to the southward was deposited in a thin layer over large areas 
of the Forty mile region, where it occurs just beneath the surface as 
a deposit similar in appearance to quicklime. 
FOSSILS. 
The following report was prepared by Doctor Knowlton on the 
material collected from the various localities visited by the party: 
Fossil plants obtained by L. M. Prindle from various localities during the 
season of 1903. 
[By F. H. Knowlton.] 
SAP 224. Irene Gulch, Chicken Creek : Fragments of stems, indeterminable. 
3AP 224i. McDowell claim, Chicken Creek : Eqtiisetum sp. 
SAP 237. Month of creek, 1 mile west of Chicken: Black carbonaceous shale 
with minute plant fragments, indeterminable. 
SAP 251. Chicken Creek : Fragments of dicotyledons, possibly Corylns Mac! 
Quarrii, but uncertain. 
SAP 330. Wolf Creek: Taxodium dnbinm? Heer ; Populns sp. 
SAP 336. Branch of Wolf Creek: Popnlns, cf. P. Pvichardsoni Heer; dicotyle 
donons fragments. 
SAP 337. Branch of Wolf Creek : Only fragments of stems and bark. 
SAP 348. Bryant Creek: Sequoia Langsdorfii (Brgt.) Heer; Taxodium dub 
him? Heer; Populus arctica? Heer; Populus Richardsoni? Heer 
Corylus MacQuarrii (Forbes) Heer; Quercus platania Heer 
Betula prisca? Ett. 
3AP 349. Bryant Creek: Sequoia Langsdorfii (Brgt.) Heer; Corylus Mac- 
Quarrii (Forbes) Heer; Populus arctica Heer; Populus Richard 
soni? Heer; Juglans nigella? Heer. 
SAP 350. Bryant Creek: Sequoia Langsdorfii (Brgt.) Heer; Equisetum sp. 
Populus latior Heer ; Populus Hookeri Heer ; Fagus Deucalionis 
linger; Quercus furcinervis (Ross M.) Unger ; Juglans sp.? 
SAP 355. Mogul Creek: Sequoia brevifolia? Heer; Corylus MacQuarri 
( Forbes ) Heer ; Populus sp. ? 
3AP 432. Mission Creek, 2 miles above junction with Excelsior: Corylus Mai 
Quarrii (Forbes) Heer; Betula prisca Ett.; Fagus Deucalionii 
Unger. 
Listing the species from all the localities, we have the following : 
Full list of species collected. 
Sequoia Langsdorfii. Corylus MacQuarrii. 
Sequoia brevifolia. Quercus furcinervis. 
Taxodium dubium. Quercus platania. 
Populus arctica. Fagus Deucalionis. 
Populus latior. Betula prisca. 
Populus Richardsoni. Juglans nigella. 
Populus Hookeri. 
Taking well into account the fact that not all of the above species are detei 
mined with absolute certainty, it is nevertheless perfectly clear that all are o 
the same age, and I do not hesitate to say that this is Arctic Miocene." No 
a trace of the Cretaceous element appears. 
" This flora was first described as the Arctic Miocene. Subsequent investigations ha 
shown that it is of Eocene age, but the old name is still retained. — L. M. Prindle. 
