File:Bulletin (1910) (14760978666).jpg

Identifier: bulletin195unit (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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Depth 96o ^.Omp. 4-18-17 ett led prod. 20 LENTICULAF
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Comp.Aug. 1913 Plugged 9Bi -/ojo Comp. 7-15 16 Settled prod 25 bid ^G/? •3 yGJOnTi SECTION in BELRIDGE FIELD, CALIFORNIA ILLUSTRATING THE OCCURRENCE ,(For legend of formations, see ^D CORRELATION OF LEN E. SWIGART, GRAPHU PRESENTATION OF UNDERGROUND CONDITIONS. 43 Upon exaruiuing the Belridge cross sectiou, sliowu iii Plate IV, it will benoticed that a shell was found in five wells from 12 to 20 feet above thehighst tar sand. The fact that this horizon is parallel to the top of the firsttar sand, which is logged in every well, is an additional indication of thestructure to bo expected below. For the most part the sands will correlate readily by accepting the structureindicated by the upper tar sand and shell layers, but when a sand occurs in onewell and a long streak of blue shale is logged at the same stratigraphic positionin an adjacent well, the engineer must loolt for new facts to determine whetherthis sand has graded into shale, has pinched out, or whether the oil sand wasnot r

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