MATANUSKA COAL FIELD. 
91 
leavy, firm, hard, and not much fractured, even at the surface, and has a high luster. 
Pyrite was not noticed. The seams are not much broken by small partings of shale and bono. 
Two sections were measured. On the south bank of Purinton Creek, at an elevation of 
$,410 feet, an exposure was measured which showed 38 feet of clean, solid coal, both roof 
Fig. 5.— Sketch map of Matanuska Valley, showing coal field, so far as known. 
and floor being concealed. (See analysis No. 1 , p. 98.) At this point the strike is N . 40° E. 
(magnetic) and the dip is 10° NW., or into the mountain. The rocks in the vicinity are 
chiefly graywacke and sandstone and show considerable variation of strike and dip. A 
