112 
ALASKAN MINERAL RESOURCES IN 1906. 
includes an 8-inch and a 6-inch seam of coal. The strike at this 
locality is N. 36° E. (magnetic) and the dip 44° SE. 
On Coal Creek, which enters the Matanuska from the south a short 
distance above Chickaloon Creek, coal occurs at three localities. At 
the first, at an elevation of 1,010 feet, three benches of coal, 2 feet, 1 
foot 5 inches, and 1 foot thick, are separated by sandstone and shale 
partings. The strike is N. 64° E. and the dip 70° SE. About 500 
feet farther upstream coal seams are seen intruded by sills of igneous 
rock. Here 5 feet 5 inches of coke occurs under an intrusive sill 12 
feet thick, mixed with coke and overlying a second intrusive sheet 14 
feet thick. Ten feet below this second sheet 6 feet 3 inches of coal, 
followed by two small seams 6 inches and 9 inches thick, may be seen. 
The strike and dip are as above. Half a mile above the first coal 
described a 6-foot seam may be observed striking N. 60° E. and 
dipping 55° NW. It may be seen from this northwestward dip that a 
possible syncline exists between this upper coal and the two localities 
S O N O R A 
SANTA ROSA 
Fig. 4.— Sketch showing location of Chickaloon tunnels. 
previously described. As the mouth of Coal Creek is approached a 
flattening in the dip may be observed, and on crossing the Matanuska 
and ascending Chickaloon Creek a quarter of a mile an anticline with 
axis striking N. 50° E. is found crossing the creek. The limbs of 
this anticline dip at an angle of 30°. Coal was observed in it, but 
measurements could not be made. 
At a point on Chickaloon Creek If miles above its mouth, but only 
half a mile in a straight line from the Matanuska, the most import ant 
coal openings of this region have been made. Nine tunnels have be J 
driven, crosscutting a number of coal seams cropping in a steep bluff on 
the north bank of Chickaloon Creek. (See fig. 4.) 
Only the thickness of the coal measured in the several tunnels will 
be given here, the more complete section being reserved for a detailej 
report. The change of direction of dip which is evident between fun- 
nel D and those farther east (C, 3, 2, B, and A) may possibly bd 
