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Soils of Crater Lake National Park
The geologic history of the park is one of fire and ice. Volcanic eruption material and glaciation combined over time to
form the soils in the park....The soils that formed from the eruption deposits can be divided into groups according to the characteristics of the parent material. Parent material from
the cataclysmic eruptions consists of ash, cinders, and pumice. The weathering of this material produced soils with characteristics that directly correspond to the percentage of
pumice, ash, hard rock fragments, and cinders in each of the stages of the eruptions. [ Formation
of the Soils (Parent Material)
- Soil Survey of Crater Lake National Park]
The Natural Resources Conservation
Service completed inventory and mapping of the soils of Crater Lake National Park in 2001. Twelve soil types that fall into six general categories were identified within Crater Lake National Park. The categories are: 1) soils on uplands, formed in air-fall
deposited ash and pumice; 2) soils on uplands, formed in air- fall deposited ash and pumice over glacial deposits; 3) soils in valleys, formed in ash flow deposits consisting of ash,
pumice and cinders; 4) soils on cinder cones; 5) soils on upland meadows with intermingled forests; and 6) soils in seeps and on stream terraces. In general, the soils have a low water
holding capacity and nutrient levels. Related Materials
Nature Notes From Crater Lake
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Tree Curvature -
L. D. Leslie, Vol. 2, No. 1, 1929
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Snow Pressure Bend -
Clyde E. Gilbert, Vol. 4, No. 3, 1931
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The Geology Of The Garfield Trail
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C. R.
Swartzlow, Vol. 7, No. 2, 1934
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The Ecology Of The Garfield Peak Trail -
Berry
Campbell, Vol. 7, No. 2, 1934
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Pumice Desert Revisited -
Elizabeth Mueller
Horn
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Pumice Fields and a Sense of Landscape Wonder -
Ron Mastrogiuseppe, Vol. 29 - 1998
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