File:Annual report of the United States Geological Survey to the Secretary of the Interior (1895) (14758343386).jpg

Identifier: annualreportofun1711geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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State miningbureau. The information gathered from the man in charge at the timeof my visit indicates that the incline followed down the bed rock in awesterly direction, sometimes cutting through it. for a distance of about900 feet, at an average angle of about 22°, so that the incline at itslower end was .;.>(> feet vertically below the mouth. The gravel on thebed rock for the first 100 feet was auriferous; then came a stretch ofsome hundreds of feet where the lava (Tuscan tuff) and the bed rockcame together, after which the incline has a smaller dip, and gravel onthe bed rock was again found. The information obtained by Diller inIS!*:; differs only in details from that given above, and he came to theconclusion that the gravels were of shore origin, lie states that thelower gravel is waterworu. The Lucretia or Berschhceker mine on Little Butte Creek about 2 ■Tenth Ann. Kept. State Mineralogist California, lX.Hi, p. Ml. See also Kleventli ami Twelfth Kepts.State Mineralogist.
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TURNER.) AURIFEROUS NEOCENE SHORE GRAVEL. 545 miles nearly due north from Magalia, which has produced1 more than$1,000,000 in gold, appears to be also in shore gravels. This mine wasvery extensively advertised in the San Francisco papers in 1894. The gravels at the Magalia Consolidated or Mineral Slide mine 2 restpartly on slates and partly on Cretaceous sandstones. The tuff over-lying the gravel has a thickness of about 575 feet. The sandstone 150feet below the gravel contains Cretaceous (Chico group) fossils. Mr.Moody, the superintendent, thought the gra vel (4 to 10 feet thick) to bea bed or sheet and not a stream deposit. Mr. Moody is also authorityfor the statement that a mastodon jawbone was found at Mineral Slidesome years ago, and was represented in San Francisco as coming fromMexico. The soft Cretaceous sandstone is here called the bed rock.The buildings are on slate, against which the Chico beds abut. Theslate does not extend farther up the creek. On the west side of LittleB

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