. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 8. — Extensive glaciers and snowfields are significant alpine features in the Northern Cascades province; view of Mount Shuksan (2,781 m.) with Mount Baker (3,285 m.) in the background. a broad plain with meandering rivers. Here, continental sedimentary formations were laid down during late Cretaceous and early Pale- ocene times. The Cascade Range was gradually uplifted during the Pliocene epoch. However, prior to this time large quantities of granitic rocks in- truded the preexisting strata
. Vegetation of Oregon and Washington. Botany Oregon Ecology; Botany Washington (State) Ecology. Figure 8. — Extensive glaciers and snowfields are significant alpine features in the Northern Cascades province; view of Mount Shuksan (2,781 m.) with Mount Baker (3,285 m.) in the background. a broad plain with meandering rivers. Here, continental sedimentary formations were laid down during late Cretaceous and early Pale- ocene times. The Cascade Range was gradually uplifted during the Pliocene epoch. However, prior to this time large quantities of granitic rocks in- truded the preexisting strata. Large masses of these rocks, including granite, granodiorite, and quartz diorite of Tertiary age, outcrop near the crest of the range in both the south- ern and northern portions of the province. In addition, older. Mesozoic granite rocks occu- py large areas to the east. The volcanic peaks of Mount Baker and Glacier Peak were built up during the Pleisto- cene epoch, chiefly of andesite flows. At the same time, glacial till was deposited in virtual- ly every major valley. These deposits are high- ly variable and may range from fine to coarse texture. Generally, the fine material is glacio- lacustrine in origin. Extreme variability of parent materials combines with effects of extensive glaciation to produce a soil pattern in the Northern Cas- cades province bewildering in complexity. Residual rock is either frequently covered by or intimately mixed with glacial materials. 15. 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 Franklin, Jerry F. cn; Dyrness, C. T. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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