BONNIFIELD AND KANTISIINA REGIONS. 223 
LOCAL OCCURRENCES. 
The most prominent exposures of coal arc on Healy Creek and Lig- 
lile or Hosanna Creek. These localities have been described by 
Brooks." In 1906 a large part of the coal-bearing area on Healy 
>eek had been staked as coal claims. 
Healy and Lignite creeks are about 5 miles apart. The valley of 
ffealy Creek near its junction with the Cantwell is limited on the 
south by a high schist ridge. A similar ridge separates the valleys of 
Tealy and Lignite creeks, but the schist part of this ridge terminates 
ibout 3 miles from the Cantwell and its continuation is composed of 
;he thick body of gravels with the underlying coal deposits, which 
Jong the Cantwell becomes continuous with the deposits of Lignite 
leek. 
HEALY CREEK. 
The deposits extend about 10 miles up Healy Creek, in places mil- 
ling parallel with the creek and in places crossing it. In the lower 
)art of the valley they dip north from the schists, on which they rest 
inconformably, at angles ranging from 25° to 35°. Toward the 
ipper limit of the deposit folding has been closer and ^here are verti- 
cal dips. The stream flat of Healy Creek is about 500 feet wide, and 
n parts of the valley coal beds form the banks for distances of a 
quarter of a mile or more close to the water. The thickness of these 
leposits from their base to the under surface of the overlying gravels, 
vhich are approximately 2,000 feet thick, is about 1,500 feet and the 
joal beds aggregate about 230 feet. The nature of the deposits and 
lie relation to them of the coals are shown in the accompanying sec- 
ion of the deposits at a point about 2 miles above the mouth of the 
stream. The coal thicknesses were measured with the tape; the 
Iiicknesses of the intervening beds are in part only approximate, 
rhis section probably does not give the total thickness of coal, because 
some beds in almost every section have been destroyed by fire. In 
;his section seven beds were observed 20 feet or more thick, aggregat- 
ng 175 feet, and sixteen thin beds higher in the deposit aggregating 
>5 feet. The lower beds are of better quality than the upper ones, 
-vhich are shaly and contain much woody material. While the thick 
;eams contain some interbedded foreign material, the proportion is 
ipparently small. The following analysis was made in the laboratory 
)f the Geological Survey and is taken from Brooks's report, already 
iited : 
" Brooks, A. IT., note Collier, A. .T., Coal resources of the Yukon, Alaska: Bull. V. S. Geol. Survey 
\ T o. 218, 1903, pp. 44-40. 
