TABLE 1 (continued)
Principal Soil Deposits
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*
*
Pertinent Engineering *
*
Major
* Division
*
*
*
Principal Soil Deposits
Characteristics
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*(cont'd)
* Estuarine deposits. Mixed deposits * Generally fine-grained
*
* of marine and alluvial origin laid * and compressible. Many *
*Materials
*transported
* down in widened channels at mouths * local variations in
*
*and deposited * of rivers and influenced by tide of * soil conditions.
*
*by running
* body of water into which they are
*
*
*water.
* deposited.
*
*
*
*
*
*
*
* Alluvial-Lacustrine deposits.
* Usually very uniform in *
*
* Material deposited within lakes
* horizontal direction.
*
*
* (other than those associated with
* Fine-grained soils
*
*
*
* organo-chemical processes. Deposits*
*
* consist of unstratified organic clay*
*
*
*
* or clay in central portions of the *
*
* lake and typically grade to
*
*
*
*
* stratified silts and sands in
*
*
*
* peripheral zones.
*
*
*
*
*
*
* Deltaic deposits. Deposits formed * Generally fine-grained
*
*
* at the mouths of rivers which result* and compressible. Many *
*
*
* in extension of the shoreline.
* local variations in
*
*
* soil condition.
*
*
*
*
*
*
*
* Piedmont deposits. Alluvial
* Generally favorable
*
*
* deposits at foot of hills or
* foundation conditions.
*
* mountains. Extensive plains or
*
*
*
*
* alluvial fans.
*
*
*
*
*
*Aeolian
*)))))))
*
*
*
*
*
*
*
*Material
* Loess. A calcareous, unstratified * Relatively uniform
*
* deposit of silts or sandy or clayey * deposits characterized *
*transported
*and deposited * silt traversed by a network of tubes* by ability to stand
*
*by wind.
* formed by root fibers now decayed. * in vertical cuts.
*
*
*
* Collapsible structure.
*
*
* Deep weathering
*
*
*
*
* or saturation can
*
*
* modify characteristics. *
*
*
*
*
*
* Dune sands. Mounds, ridges, and
* Very uniform grain
*
*
*
* hills of uniform fine sand
* size; may exist in
*
* characteristically exhibiting
* relatively loose
*
*
*
* rounded grains.
* condition.
*
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7.1-4
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