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Lithostratigraphy
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Chronostratigraphy
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Allostratigraphy
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Hydrostratigraphy
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Primary source[edit | edit source]

Willman, H. B., and John C. Frye, 1970, Pleistocene Stratigraphy of Illinois: Illinois State Geological Survey Bulletin 94, 204 p.

Contributing author(s)[edit | edit source]

H. B. Willman and John C. Frye

Name[edit | edit source]

Original description[edit | edit source]

Radnor Till Member, Glasford Formation (William and Frye 1970).

Derivation[edit | edit source]

The Radnor Till Member of the Glasford Formation is named for Radnor Township, Peoria County.

Other names[edit | edit source]

History/background[edit | edit source]

Type section[edit | edit source]

Type location[edit | edit source]

The Radnor Till is described from roadcut exposures in the Jubilee College Section (table 6), SW SW SW Sec. 7, T. 10 N., R. 7 E. It is also described in the Farm Creek, Tindall School, and Toulon Sections (table 6). <center> {| class="wikitable" style="text-align: center;" |- |'''Table 6 -- Stratigraphic Sections (partial)'''<br>The following 21 stratigraphic sections describe exposures in Illinois and illustrate many of the aspects of Pleistocene stratigraphy. These sections contain the type localities for 21 rock-stratigraphic units, 4 soil-stratigraphic units, and 3 time-stratigraphic units and include paratypes for several other units. The sample numbers preceded by "P" are the numbers used in the Illinois State Geological Survey collections. Analytical data on many of these samples are on file at the Survey. The sections are arrange alphabetically by name. |- |<gallery caption="" widths=250px heights=250px perrow=4> 94-tb_6-d.jpg|{{file:94-tb_6-d.jpg}} 94-tb_6-e.jpg|{{file:94-tb_6-e.jpg}} 94-tb_6-f.jpg|{{file:94-tb_6-f.jpg}} 94-tb_6-i.jpg|{{file:94-tb_6-i.jpg}} 94-tb_6-j.jpg|{{file:94-tb_6-j.jpg}} 94-tb_6-k.jpg|{{file:94-tb_6-k.jpg}} </gallery> |} </center>

Type author(s)[edit | edit source]

Type status[edit | edit source]

Reference section[edit | edit source]

Reference location[edit | edit source]

Reference author(s)[edit | edit source]

Reference status[edit | edit source]

Stratigraphic relationships[edit | edit source]

In the type section the Radnor Till is bounded at the top by the top of the Sangamon Soil. It is overlain by Roxana Silt and it rests on the Toulon Member. The Radnor Till Member may be a stratigraphic equivalent of the Sterling Till Member of northern Illinois but is geographically separated from it by the Green River Lobe.

Extent and thickness[edit | edit source]

Its geographic distribution is shown in figure 6 and its spatial relations are shown diagrammatically in figure 7. <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="" widths=250px heights=250px perrow=4> 94-fig_6.jpg|{{file:94-fig_6.jpg}} 94-fig_7.jpg|{{file:94-fig_7.jpg}} </gallery> |} </center>

Lithology[edit | edit source]

The Radnor Till is gray, compact, silty, and high in illite content. Its matrix grain size and composition of clay minerals are given in tables 2 and 5, and its heavy mineral analyses are summarized in table 4. <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="" widths=250px heights=250px perrow=4> 94-tb_2.jpg|{{file:94-tb_2.jpg}} 94-tb_4.jpg|{{file:94-tb_4.jpg}} </gallery> |} </center> <center> {| class="wikitable" style="text-align: center;" |- |<gallery caption="Table 5 -- Selected Analyses from Stratigraphic Sections Described in Table 6 (X-ray analyses by H. D. Glass, Illinois State Geological Survey)." widths=250px heights=250px perrow=4> 94-tb_5-e.jpg|{{file:94-tb_5-e.jpg}} </gallery> |} </center>