U.S. Geological Survey Professional Paper
U.S. Geological Survey Professional Paper
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The same grade continues, and there are also as noted by Pettee * several sudden ** jumps'' amounting to 3 or 4 feet at a time. Pettee thought these represented rapids or falls, but it is much more likely that they are actual faults crossing the bedrock. When the writer ■^ visited the mine in 1887, the workings had advanced 3,900 feet under I the ridge, the fall in that distance being 150 feet. Under the summit of the ridge a sudden drop was met, cutting oflF the gravel sharply and necessitatin...g another tunnel 50 feet lower. This no doubt represents the beginning of a second fault zone, which has depressed the channel on the Nelson Creek side by at least several hundred or a thousand feet. This fault zone Ues approximately in the extension of the Spanish Peak fault, but just how the two should be connected is doubtful, as no clearer evidence of dislocation is apparent in the space between the two breaks.
Figure 8 illustrates the relations described above. The even grade of the Neocene river below La Porte of 100 feet to the mile is replaced between the Thistle tunnel and Thistle shaft by a grade of 125 feet to the mile, and from the latter place to Hepsidam there is a long stretch of apparently even grade of 200 feet to the mile.
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You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The same grade continues, and there are also as noted by Pettee * several sudden ** jumps'' amounting to 3 or 4 feet at a time. Pettee thought these represented rapids or falls, but it is much more likely that they are actual faults crossing the bedrock. When the writer ■^ visited the mine in 1887, the workings had advanced 3,900 feet under I the ridge, the fall in that distance being 150 feet. Under the summit of the ridge a sudden drop was met, cutting oflF the gravel sharply and necessitatin...g another tunnel 50 feet lower. This no doubt represents the beginning of a second fault zone, which has depressed the channel on the Nelson Creek side by at least several hundred or a thousand feet. This fault zone Ues approximately in the extension of the Spanish Peak fault, but just how the two should be connected is doubtful, as no clearer evidence of dislocation is apparent in the space between the two breaks.
Figure 8 illustrates the relations described above. The even grade of the Neocene river below La Porte of 100 feet to the mile is replaced between the Thistle tunnel and Thistle shaft by a grade of 125 feet to the mile, and from the latter place to Hepsidam there is a long stretch of apparently even grade of 200 feet to the mile.
What to read after U.S. Geological Survey Professional Paper?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
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