Historical:Modern Soil

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Pleistocene stratigraphy of Illinois
Series Bulletin 94
Author H. B. Willman and John C. Frye
Date 1970
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Lithostratigraphy: Modern Soil
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Holocene Series


H. B. Willman and John C. Frye

Name origin

This unit has long been called "Modern Soil," and it seems undesirable to replace it with a geographic name.

Type section

As a stratigraphic entity the type section is designated units 4-8 of the Buda East Section (Frye, Glass, and Willman, 1968, p. 20), SE SE SW Sec. 31, T. 16 N., R. 8 E., Bureau County.

Stratigraphic relationships

In a stratigraphic sequence it is overlain only by man-made deposits.

Extent and thickness

The soil ranges from very shallow to many feet in depth and is developed in any sediment that may underlie the present surface.


The term Modern Soil is applied to any soil profile genetically related to the modern topographic surface.

The Modern Soil is the soil described in the many county soil reports of the University of Illinois Agricultural Experiment Station and of the U. S. Department of Agriculture Soil Conservation Service.


FRYE, J. C, H. D. GLASS, and H. B. WILLMAN, 1968, Mineral zonation of Woodfordian loesses of Illinois: Illinois State Geological Survey Circular 427, 44 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation