File:Bulletin (1910) (14595269920).jpg

Identifier: bulletin190unit (find matches)
Title: Bulletin
Year: 1910 (1910s)
Authors: United States. Bureau of Mines
Subjects: Mines and mineral resources Mines and mineral resources Mining engineering
Publisher: Washington U.S. Govt. Print. Off. (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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eries ofgravel plains out of which well-rounded hills rise to elevations of500 to 800 feet above the general level. Winding in a southwesterlydirection through the district, Green River has cut its bed throughglacial material into underlying coal formations. This river hasprecipitous canyons, in many places 300 to 400 feet deep. Alongits eastern margin the field rises to the foothills of the CascadeMountains, which are made up of recent lava flows overlying the coalmeasures. These mountains rise abruptly from the level of thegravel plains to a height of 3,000 to 4,000 feet. The district isconnected by railroad with Seattle and Tacoma, though the easternmargin is still rather inaccessible on account of precipitous foothills. It is not yet possible to give the stratigraphy of the Green Riverfield in detail, but some general relations can be mentioned. Themeasured coal-bearing strata represent a total thickness of more than8,000 feet and have been divided into three series: The Upper, or
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NG COUNTY. O SO too ZOO WESTERN WASHINGTON. 19 Kummer, 1,751 feet thick; below this, an intermediate zone knownas the Franklin, 3,620 feet thick; next the Bayne, 3,021 feet thick.5 KUMMER SERIES. At least 10 beds of coal and bony coal have been observed withinthe Kummer series, 4 of which have been worked at the Kum-mer mine on Green River, shown as No. 15 in Figure 6. This coal isfair grade, but is higher in moisture and somewhat higher in ashthan the better coals in the Franklin series. FRANKLIN SERIES. About 20 coal and bony beds have been observed among the coals,sandstones, and shales that constitute the Franklin series. Near thecentral part of the series is the well-known McKay bed, which rangesin thickness from 4 to 6 feet. The excellent quality of this coal islargely responsible for the early development of the field. Severalother beds contain coal of good quality, but higher in ash; amongthem are the Gem, the Fulton or No. 12, No. 10, and No. 9. Thesebeds have been mined to s

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