The late Professor Henry D. Rogers, in his admirable paper on the Physical Features of America, being part of his contribution to Keith Johnston’s Atlas, full of knowledge and of fine generalization, says of this northwest belt, that it is “little known in its topography to any but the roving Indians and the thinly scattered fur-trappers.” But there are certain general features which he proceeds to designate. According to him, it belongs to what is known as the tertiary period of geology, intervening between the cretaceous period and that now in progress, but including also granite, gneiss, and ancient metamorphic rocks. It is not known if the true coal measures prevail in any part, although there is reason to believe that they exist on the coast of the Arctic Ocean between Cape Lisburne and Point Barrow. Beginning at the south, we have Sitka and its associate islands, composed chiefly of volcanic rocks, with limestone near. Little is known even of the coast between Sitka and Mount St. Elias, which, itself a volcano, is the beginning of a volcanic region occupying the peninsula of Alaska and the Aleutian Islands, and having no less than thirty volcanoes, some extinct, but others still active. Most of the rocks here are volcanic, and the only fossiliferous beds are of the tertiary period. North of Alaska, and near the mouth of the Kwichpak, the coast seems volcanic or metamorphic, and probably tertiary, with a vein of lignite near the head of Norton Sound. At the head of Kotzebue Sound the cliffs abound in the bones of elephants and mammals now extinct, together with those of the musk-ox and other animals still living in the same latitude. From Kotzebue Sound northward, the coast has a volcanic character. Then at Cape Thompson it is called subcarboniferous, followed by rocks of the carboniferous age, being limestones, shales, and sandstones, which extend from Cape Lisburne far round to Point Barrow. At Cape Beaufort, very near the seventieth parallel of latitude, and north of the Arctic Circle, on a high ridge a quarter of a mile from the beach is a seam of coal which appears to be of the true coal measures. From this general outline, which leaves much in uncertainty, I come to what is more important. It is not entirely certain that iron has been found, although frequently reported. Evidence points to the south, and also to the north. Near Sitka it was reported by the Russian engineer Doroschin, although it does not appear that anything has been done to verify his report. A visitor there, as late as last year, saw excellent iron, said to be from a bed in the neighborhood, reported inexhaustible, and with abundant wood for its reduction. Then again on Kotzebue Sound specimens have been collected. At 66° 13´ Kotzebue found a false result in his calculations, which he attributes to the disturbing influence of “iron.”[141] A resident on the Yukon thinks that there is iron in that neighborhood.