. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. trine deposits mark the limits of these lakes. giaciofluvial materials often give rise to mod- Fewer soils in the Southern Washington erately well drained to imperfectly drained Cascades province are developed in glacial ma- Brown Podzolic or Gray-Brown Podzolic soils, terials and, because of generally less rugged These soils are characteristically sandy loam topography, there are smaller areas of Rock- in texture, and B horizons are iron stained lands and Lithosols than in the Northern Cas- and of
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. trine deposits mark the limits of these lakes. giaciofluvial materials often give rise to mod- Fewer soils in the Southern Washington erately well drained to imperfectly drained Cascades province are developed in glacial ma- Brown Podzolic or Gray-Brown Podzolic soils, terials and, because of generally less rugged These soils are characteristically sandy loam topography, there are smaller areas of Rock- in texture, and B horizons are iron stained lands and Lithosols than in the Northern Cas- and often contain iron concretions. Soils in cades. Soils developed in andesite and basalt areas of deep pumice deposits are most often range widely in profile characteristics varying Podzols or Brown Podzolics. Podzolic soils on from stony Lithosols to deep, well-developed pumice typically have gray sandy A2 horizons Reddish Brown Lateritic soils. Soils with at over a reddish gravelly coarse sand B2ir hori- least moderate development commonly have zon. brown to reddish-brown loam or silt loam sur- The most common soils are Podzols in the face horizons underlain by B horizons of clay northern and Brown Podzolic soils in the loam or silty clay loam texture. In many loca- southern portion of the province. These are tions, the surface soil is mixed with or entire- accompained by substantial areas of Rock- ly composed of pumice particles. Glacial or land, Lithosolic, and Regosolic soils, especial-. Figure 11. — The western Cascades of Oregon are deeply dissected with the higher ridges generally com- posed of thick flows of andesite; this view shows Twin Buttes in the foreground and the Three Sisters, located in the High Cascades province, in the background. 18. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Frankli
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