During the field seasons of 1911 and 1912, the writer was employed mapping and studying the geology along the 141st meridian (the Yukon-Alaska International Boundary) between Porcupine and Yukon rivers, or between latitudes 67° 25′ and 64° 40′, a distance of 191 miles. This work was performed on behalf of the Canadian Geological Survey, and was extended for 2 or 3 miles on each side of the boundary line, an agreement having been entered into between the Geological Surveys of the United States and Canada whereby geological work was conducted on both sides of the 141st meridian to the north of the Porcupine, by members of the United States Survey, in exchange for similar work by the Canadian Geological Survey, to the south of this river.
The belt to the south of Porcupine River proved, to be of particular interest and stratigraphic importance, as all the Paleozoic systems from . . .