20 PETROLEUM OF PACIFIC 1 COAST OF ALASKA. L bull. 250. 
ably has considerable length and displa cement, and an undetermined 
number of smaller ones. 
One of these folds is an incline exposed near the headwaters of 
Queen Creek on the divide between the Shepherd Creek and Lake 
Kushtaka valleys. The rocks here have a strike of N. 04° to 66° E., 
with a dip of 42° NW. on the northwest flank of the fold, and 58° 
SE. on the southeast flank. The latter is cut by a fault of unknown 
but probably of considerable magnitude. The other is a sharp syn- 
cline, which apparently lies in the hills east of Lake Charlotte. Its 
presence is indicated by the fact that the dip of the Charlotte seam at 
the openings above the lake is southeast. It is not known how far in 
either direction this southeast dip continues. 
A northeast strike and a northwest dip, corresponding to many of 
those alluded to above, may be seen on Kayak and Wingham islands 
and in the hills of the Nitchawak region. Each of these areas con- 
sidered independently is therefore monoclinal. The intervening 
areas, where the solid rock is concealed by water or lowland, are so 
broad that the general structure can not be made out. 
The rocks on the shore of the mainland near Fox Island, and appar- 
ently those of the islands themselves, have a strike of N. 70° W., 
parallel to the shore, with a steep seaward dip. The high ridge north- 
east of this point seemingly consists of rocks standing almost verti- 
cal, with a north-south strike parallel to the ridge. On Lone Baldy 
Mountain, about 3 miles north of Fox Islands, the strike is N. 
80° E. and the dip 80° NW. The high ridge about 2 miles north of 
this point apparently has a strike parallel to this and a steep dip. 
The relation of this dip to that observed at Fox Islands and on the 
ridge northeast of them has not been determined. 
GENERAL FEATURES. 
It can be seen from the statements given above that the structure of 
this region is very complex, at least so far as the minor details are con- 
cerned. The outcrops are almost wholly confined to the higher ridges 
and to the deep cai^ons. Many of the latter were almost inaccessible 
to the author on account of the amount of snow and ice at the time of 
his visit. The observations are, therefore, not numerous and are 
widely scattered. It is probable that a large proportion of these 
observations do not represent the major structure of the region, but 
rather a minor crumpling which is attendant upon the dominant, 
simpler, structure. This major structure can be made out only by 
platting so large a number of observations that the entire structure 
will be evident, both in its broader features and in its less essential 
and diverse details, or else by determining some characteristic strata 
whose general position of outcrop can be readily followed, and which 
