Richmond and Frye (1957, pp. 758-763) review difficulties encountered in classifying a soil within the framework of the present rules of stratigraphic nomenclature and propose the adoption of a new classification, soil-stratigraphic units. In their summary of reasons for establishing the new classification, they list of number of characteristics that soils and conventional rock-stratigraphic units have in common; they also list the following differences:
They summarize:
Stratigraphic units are products of the environments in which they form. All possess features which are in part dependent, in part independent of the rock fragments of which they are composed. For...
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