If you need an accessible version of this item please contact JSTOR User Support

The Petrology and Geology of a Portion of Malheur County, Oregon

B. Coleman Renick
The Journal of Geology
Vol. 38, No. 6 (Aug. - Sep., 1930), pp. 481-520
Stable URL: http://www.jstor.org/stable/30060407
Page Count: 40
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
The Petrology and Geology of a Portion of Malheur County, Oregon
Preview not available

Abstract

Along the Owyhee River in southeastern Malheur County the rocks are of late Tertiary and Quaternary age, consisting of conglomerate, arkosic sand, and sandy shale, all derived largely from volcanic material and interbedded with volcanic tuff, basalt and, rhyolite. The stratigraphy and petrology of the igneous and sedimentary rocks are described in some detail. The structure simulates a northward-plunging anticlinal nose that has been considerably faulted, mostly parallel to the trend of the nose. Locally the basalt flows and the sedimentary beds immediately below the flows are colored red. Also, some of the basalts contain zeolites. The cause of the red color and the origin of the zeolites are discussed, and the hypothesis is advanced that some of the flows were erupted into standing water.

Page Thumbnails

  • Thumbnail: Page 
481
    481
  • Thumbnail: Page 
[482]
    [482]
  • Thumbnail: Page 
483
    483
  • Thumbnail: Page 
484
    484
  • Thumbnail: Page 
485
    485
  • Thumbnail: Page 
486
    486
  • Thumbnail: Page 
487
    487
  • Thumbnail: Page 
488
    488
  • Thumbnail: Page 
489
    489
  • Thumbnail: Page 
490
    490
  • Thumbnail: Page 
491
    491
  • Thumbnail: Page 
[492]
    [492]
  • Thumbnail: Page 
[493]
    [493]
  • Thumbnail: Page 
494
    494
  • Thumbnail: Page 
[495]
    [495]
  • Thumbnail: Page 
496
    496
  • Thumbnail: Page 
497
    497
  • Thumbnail: Page 
[498]
    [498]
  • Thumbnail: Page 
499
    499
  • Thumbnail: Page 
500
    500
  • Thumbnail: Page 
501
    501
  • Thumbnail: Page 
502
    502
  • Thumbnail: Page 
[503]
    [503]
  • Thumbnail: Page 
504
    504
  • Thumbnail: Page 
505
    505
  • Thumbnail: Page 
506
    506
  • Thumbnail: Page 
507
    507
  • Thumbnail: Page 
[508]
    [508]
  • Thumbnail: Page 
509
    509
  • Thumbnail: Page 
510
    510
  • Thumbnail: Page 
511
    511
  • Thumbnail: Page 
512
    512
  • Thumbnail: Page 
513
    513
  • Thumbnail: Page 
514
    514
  • Thumbnail: Page 
515
    515
  • Thumbnail: Page 
516
    516
  • Thumbnail: Page 
517
    517
  • Thumbnail: Page 
518
    518
  • Thumbnail: Page 
519
    519
  • Thumbnail: Page 
520
    520