14 SURVEY OF IDAHO-MONTANA BOUNDARY LINE. [bull. 170. 
transported on pack mules to their destinations. They will then be firmly and 
securely cemeted with Portland cement and established in the same manner as the 
other stone monuments. The monument on the international boundary in addi- 
tion to having the inscription ' ' Idaho " and ' ' Montana " on the west and east sides, 
respectively, will have "Canada" inscribed on the north. 
Intermediate between the stone monuments above described will be placed at 
prominent summits, road, trail, or stream crossings, at distances not exceeding a 
mile apart, and intervisible whenever possible, wrought-iron posts 6 feet in length, 
3 feet of which shall be above ground and 3 feet below the surface, with a brass 
cap similar in general design to the standard iron posts used by the United States 
Geological Survey. The cap surmounting the post will be inscribed as below, the 
line cut on the cap being coincident with the boundary line: 
IDAHO 
BOUNDARY 
LINE 
MONTANA 
Under each post will be placed a stone marked with charcoal or a vial filled 
with ashes. 
It is assumed that generally a soil surface for the insertion of the stone or iron 
posts can be found sufficiently near the points it is desired to establish the monu- 
ments. If, however, the exact point should fall on rock at the international 
boundary or the summit of the Bitterroot Mountains, a hole will be chiseled in 
the rock to a depth of about 8 inches and a little larger than the base of the 
monument. Into this hole the monument will be firmly cemented with the best 
Portland cement. If the, point for the location of one of the iron posts should 
fall on a rock surface, a copper plug similar to that used by the United States 
Geological Survey will be cemented in the -rock and a truncated conical mound 
of stone, not less than 2h feet high and 5 feet broad, will be placed to the north 
of the point at a distance of 4 feet from it. The copper plug will be stamped as 
MONT. 
follows: — and will be properly oriented. 
IDA.. 
When suitable bearing trees are found within a distance of 100 feet of a stone 
monument or iron post, they must be marked on the side facing the corner in the 
manner prescribed in the manual for special corners. 
In addition, each iron post will be witnessed, when possible, by mounds of earth 
or stone, one in Idaho and one in Montana, the material for the mounds to be 
taken from pits, one north and one south of the post, dug crosswise of the line. 
The pits will be 3 feet east and west, 2 feet north and south, and 1 foot deep, and 
their centers, as well as the centers of the mounds, will be 4 feet from the center 
of the iron post. 
PLATS AND FIELD NOTES. 
Special attention is called to the provisions of the law relating to plats and field 
notes. 
All plats and field notes shall be approved and certified to by the Director of the 
Geological Survey, and four copies thereof shall be returned— one for filing in the 
surveyor-general's office of Idaho, one in the surveyor-general's office of Montana, 
one in the office of the Geological Survey, and the original in the General Land 
Office. All field notes must be transcribed on a typewriting machine. 
The results of the topographic notes will be embodied in a map which will be 
drawn on a scale of 1 inch to a mile. Detailed diagrams of the points on the inter- 
national boundary and at the intersections of the Bitterroot Mountains will be 
made. 
