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Published online 4 August 2005
Published in Soil Sci Soc Am J 69:1422-1431 (2005)
DOI: 10.2136/sssaj2000.0221
© 2005 Soil Science Society of America
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Tephra Influence on Spokane-Flood Terraces, Bonner County, Idaho

S. H. Brownfielda, W. D. Nettletonb,*, C. J. Weiselc, N. Petersonc and C. McGrathc

a Volunteer USDA-NRCS, Soil Consultant, Boise, ID 83702
b Volunteer USDA-NRCS, NSC, National Soil Survey Lab., Lincoln, NE 68508
c Usda-Nrcs, Boise, Id 83702



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  		Fig. 1. Location of Bonner County and the study area near the town of Spirit Lake in the Idaho panhandle (Based on Parsons et al., 1981, Fig. 1 and 2).

 


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  		Fig. 2. Transect across the study area from Hoodoo Creek on the east to Spirit Lake on the west.

 


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  		Fig. 3. Bonner profile sampled on terrace T1. The scale is in decimeters.

 


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  		Fig. 4. Rathdrum profile on terrace T1. The scale is in decimeters.

 


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  		Fig. 5. Box and whisker plot of the tephra content of the very fine sand of the A and B horizons of the Bonner and Kootenai soils on the higher terraces (T1–T3) and the lower terraces (T4–T5). Far-outside points that lay more than 3.0 times the interquartile range above or below the box are shown as small squares.

 


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  		Fig. 6. Photomicrographs of the A1 horizon of the Kootenai soil on terrace T1 in plain light showing a sand-size quartz grain (upper left, QTZ) in an isotic plasmic fabric that includes some glass shards (Gs). The c/f distribution is gefuric. The coating on the Quartz and schist grain (right center, Bt) is isotropic (amorphous) (a). The weathered part (vermiculite) of the schist grain is anisotropic and partly pleochoic. Frame width (F.W.) = 2.0 mm.

 


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  		Fig. 7. Photomicrographs of a glass shard (Gs) of the Kootenai soil on terrace T1 in plain light showing its amorphous weatherin rind (a). Frame width = 0.5 mm

 




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