Excerpt from A Geological Reconnaissance in Northwestern Oregon

Along the coast of Oregon and California, from the Columbia to near the boundary of Mexico, there is a prominent range of mountains known generally as the Coast Range. The essential continuity of this range, as well as its distinctive parts, was long since pointed out by Professors Danal and Newberry.2 In middle California and northern Oregon, where the range 18 bounded on the east by a great valley, it is distinct, and these portions are readily distinguished, respectively, as the Coast Range of California and the Coast Range of Oregon. But between them, in northwestern California and southwestern Oregon, there is a large complex group of mountains, in which the Cascade, Sierra Nevada, and the Coast Range appear to meet. This irregular group contains many individual ridges and peaks, as, for example, Yallo Bally, Bully Choop, Salmon, South Fork, Trinity, Eddy, Scott, and Marble Mountain in California, as well as Siskiyon, Rogue River, Umpqua, and other mountains in Oregon. Upon geo logical grounds it appears that this group of mountains belongs to the Coast Range rather than to the Sierra Nevada or Cascade Range, and needs a special name to distinguish it from the Coast Range of Oregon on the north and the Coast Range of California on the south. For this reason this group has been designated the Klamath Mountains, after the principal river which cuts through these mountains to the sea.

The Klamath Mountains of Oregon extend northward from the southern boundary to about the Middle Fork of the Coquille. Beyond that point the Coast Range of Oregon stretches away to the Columbia.

The reconnaissance outlined in these pages extended throughout the Coast Range of Oregon and touched at a few points upon the northern border of the Klamath Mountains and the western foot of the cascade Range. In the accompanying map, Pl. IV, the route is illustrated.

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