SKETCH OF GEOLOGY. 
15 
studying the stratigraphy and mineral resources of the Yukon Terri- 
tory. Notable among these is R. G. McConnell. a 
The following table is intended to present in a concise form the pres- 
ent state of knowledge of the stratigraphic column of the Yukon below 
the international boundary. The table is based on the results of all 
previous investigations of the region, modified by the field studies of 
the writer and the studies by various paleontologists of the collections 
made. Though a number of horizons were found which up to the 
time of the present investigation were unknown in the region, it 
has been thought best not to introduce any new formation names in 
this publication nor to attempt any far-reaching correlations. The 
formation names already current in geologic literature have been 
retained as far as the} r were borne out by the studies of the last season. 
Provisional tabular statement of Yukon stratigraphy. 
Arc. 
Formation name. 
Contact relations. 
Li t hologic character. 
Recent 
Alluvium 
Flood-plain deposits. 
Fresh-water silts, sands, and 
Pleistocene? 
Yukon silts 
Unconformity . 
gravels. 
[T w el ve m i 1 e 
Post-Eocene 
Tertiary. 
beds. 
| Palisade con- 
[ glomerate. 
(?) 
Sands, clays, and gravels. 
Upper Eocene. . . 
Kenai series . . . 
(?) 
Fresh-water sandstones, shales, 
and conglomerates. 
Upper C r e t a - 
ceo us. 
Conformity?... 
Fresh-water and marine sand- 
stones, shales, arkoses, and 
conglomerates. 
Lower Creta- 
ceous. 

(?) 
Fresh-water calcareous sand- 
stones. 
Do 
(?) 
Marine black, slaty shales, and 
thin-bedded limestones. 
Permian 
Unconformity - 
Marine, massive, white lime- 
stones, heavy conglomerates, 
and gray shales. 
Lower Carbonif- 
do 
Marine black slates and thin- 
erous. 
bedded limestones. 
Devonian? 
Rampart series . 
(?) 
Volcanic material, interbedded 
with limestone, slate, etc. 
Older than De- 
vonian. 
Forty mile series 
Unconformity . 
Schists and interbedded lime- 
stones. 
Do 
Birch Creek 
series. 
Conformity 
Quartzites and schists. 
Undetermined . . 
Pelly gneisses. . 
Unconformity . 
Gneissoid and schistose gran- 
ites. 
The section along the Yukon between the international boundary 
and the delta includes terranes widely separated in the geologic column, 
a McConnell, R. G., Yukon district; Summary report of the Geological Survey Dept. for the year 
1900, Ottawa, 1901, pp. 37-52. 
