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Tephra Influence on Spokane-Flood Terraces, Bonner County, Idaho

^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

View larger version (29K): [in a new window]   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).

View larger version (17K): [in a new window]   Fig. 2. Transect across the study area from Hoodoo Creek on the east to Spirit Lake on the west.

View larger version (108K): [in a new window]   Fig. 3. Bonner profile sampled on terrace T1. The scale is in decimeters.

View larger version (126K): [in a new window]   Fig. 4. Rathdrum profile on terrace T1. The scale is in decimeters.

View larger version (14K): [in a new window]   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.

View larger version (143K): [in a new window]   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.

View larger version (191K): [in a new window]   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