MATANUSKA AND TALKEETNA BASINS. 113 
explained b}^ the presence of an anticlinal axis passing westward from 
the anticlinal fold at tunnel No. 1, or possibly by irregularities in beds 
representing the south side of such an anticline. It has been found 
difficult to correlate the several beds within these tunnels, because of 
striking irregularities in their thickness. In tunnel A three seams 
vere seen. The first at the face measured 16 feet 7 inches, in which 
s included a 9-inch layer of bone and coal 1 foot 2 inches from the 
Dottom. The second seam is small, containing but two narrow 8-inch 
ayers separated by 5 inches of bone and shale. The third seam is 
5 feet thick and occurs 77 feet from the mouth of the tunnel. 
In tunnel B as many as six distinct seams were measured. Several 
)f these, however, contain intervals of shale. Near the face of the tun- 
iel a 2-foot 1-inch seam occurs in which is included 4 inches of bone. 
3n passing outward a thickness of 5 feet 9 inches of sandstone brings 
:he section to a 17-foot 3-inch seam. As in tunnel A, a 1-foot interval 
)f bone is seen near its floor. This seam is undoubtedly to be corre- 
ated with the thick seam of tunnel A. Toward the mouth of the 
yunnel the following coal occurs: A 6-foot seam of bony coal in which 
s included a foot of sandstone; a 2-foot 4-inch seam of coal; a 7-foot 
)-inch seam, at the top of which is 1 foot of bone. Two feet below this 
seam is 3 feet 7 inches of coal, 7 inches of which is bone. 
In tunnel No. 2 a thick bony seam that occurs in B was measured, 
;>ut shows 12 feet 11 inches. It is in this tunnel very bony and 
ncludes 1 foot 6 inches of shale near its middle. A drift has been run 
Tom B to No. 2, so that there is no doubt of the correlation. A second 
seam, separated from this one by 18 feet of shale, measures 4 feet, 7 
nches of which is bony. 
Tunnel No. 3 reveals the thick seam at the face. Its total width 
ioukl not be seen, but 7 feet 10 inches may be measured, including a 
2-foot interval of shale which probably corresponds to the 1 foot 6 
nches of shale in the same seam in tunnel No. 2. The second seam of 
runnel No. 2 has in No. 3, 2 feet 5 inches of very bony coal in its center, 
[ts total width is 16 feet 2 inches. About 20 feet from the mouth of 
bunnel No. 3 a third seam measures 4 feet 1 inch. Small streaks of 
bone occur in it. 
In tunnel C but one small seam was measured. It was 4 feet thick, 
2 feet of which was coal with shale. 
In tunnel D two seams of crushed coal, each 2 feet 6 inches thick and 
separated by 49 feet of sandstones and shale, were seen. 
In tunnel E 10 feet 11 inches of coal containing several 6-inch streaks 
ol bone and 2 feet of crushed shale mixed with coal was seen. 
At thp, face of tunnel No. 4 a thickness of 5 feet of crushed coal was 
exposed 
Bull. 314— 07 8 
