Maps And Descriptions of Routes of Exploration in Alaska in 1898 With General
Maps And Descriptions of Routes of Exploration in Alaska in 1898 With General
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In the region of the Alaska-Treadwell mine the main mass of the country and the oldest rock is a carbonaceous slate of very uniform texture. The age of the slate was thought by Dr. Dawson to be very probably Triassic, from its analogy with rocks on the coast of British Columbia, There is no direct evidence as to age yet available. After the sediments had been reduced to the condition of slate, syenite was intruded into them. This intrusion was of a very irregular character, although it may be c...alled a dike. In the Alaska-Treadwell it swells out to 450 feet in width, including, however, large "horses. " To the northwest and to the southeast it narrows and is sometimes reduced > Seventeenth Ann. Kept. U. S. Geol. Survey, Part 1, 1896, p. 772. ' Eighteenth Ann. Rept. U. S. Geol. Sui-vey, Part III, 1898, p. 60.
102 MAPS AND DKSCRIFPIONS OF ALASKA.
to a system of parallel dikes divided by slate. After the syenite intrusiou eaiue one of g-abhri). It forms a dike a couple of hundred feet in width, and follows the northeast wall of the deposit pretty closely, thou
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To quickly assess the difficulty of the text, read a short excerpt:
In the region of the Alaska-Treadwell mine the main mass of the country and the oldest rock is a carbonaceous slate of very uniform texture. The age of the slate was thought by Dr. Dawson to be very probably Triassic, from its analogy with rocks on the coast of British Columbia, There is no direct evidence as to age yet available. After the sediments had been reduced to the condition of slate, syenite was intruded into them. This intrusion was of a very irregular character, although it may be c...alled a dike. In the Alaska-Treadwell it swells out to 450 feet in width, including, however, large "horses. " To the northwest and to the southeast it narrows and is sometimes reduced > Seventeenth Ann. Kept. U. S. Geol. Survey, Part 1, 1896, p. 772. ' Eighteenth Ann. Rept. U. S. Geol. Sui-vey, Part III, 1898, p. 60.
102 MAPS AND DKSCRIFPIONS OF ALASKA.
to a system of parallel dikes divided by slate. After the syenite intrusiou eaiue one of g-abhri). It forms a dike a couple of hundred feet in width, and follows the northeast wall of the deposit pretty closely, thou
What to read after Maps And Descriptions of Routes of Exploration in Alaska in 1898 With General?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read online
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