56 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
in situ, but in some places bodies of shallow gravel occur. These grav- 
els consist principally of angular material derived from the immediate 
bed rock, but they contain some bowlders and pebbles which have 
undoubtedly been transported. The gravels of the creeks and gulches 
incised in the bench are essentially similar to those found on the 
bench. 
From the evidence in hand, it seems at least possible that the low- 
land of the Baker Flats is the bed of an extinct lake and that the 
broad bench at Glenn Creek is in part a beach and in part a local 
peneplain produced at the base-level of this lake while it existed. 
The mixture of local and transported material is readily explained in 
this way, either by water action alone or by floating ice. 
The pieces of gold found here are apparently not greatly water- 
worn, and have probably not been carried far from their original posi- 
tion in the bed rock. The bed rock of the gold-bearing area consists 
of schist, belonging to a series which has an extensive distribution 
in this region. On Glenn Creek, however, a system of quartz string- 
ers striking parallel with the longer dimension of the gold-bearing 
area has been noted, making it seem probable that there is a zone of 
mineralization in the bed rock underlying the gold-bearing area. 
The information at present available regarding the geology and 
physiography of this region is too meager to Avarrant any definite con- 
clusions as to the origin of the placers, but the following explanation, 
which is believed to agree with the facts as far as known, is advanced 
tentatively : 
The gold at Glenn Creek has been derived from a zone of mineral- 
ization in the bed rock north of Baker Flats. This zone extends east- 
ward for 10 or 12 miles, to the northern tributaries of the Hootlenana, 
on which placers have recently been found, but is less than a mile in 
width. As the bed rock was eroded, the gold from this mineralized 
zone was concentrated by both wave and stream action along the mar- 
gin of the old Baker Lake. By the draining of this lake the old beach 
was left as a high bench, and the gold from it has been partly recon- 
centrated in the beds of recent streams, to make the creek placers, 
while a part of the original beach deposit remains in the form of 
bench placers. 
