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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]

Hulick Till Member, Glasford Formation (Willman and Frye 1970).

Derivation[edit | edit source]

The Hulick Till Member is named for Hulick School, 1.5 miles southwest of the type section.

Other names[edit | edit source]

The Hulick Till in part of western Illinois was called Buffalo Hart in previous reports (Wanless, 1957).

History/background[edit | edit source]

Type section[edit | edit source]

Type location[edit | edit source]

The type section is in roadcut exposures at the Lewistown Section (table 6), SW SE SE Sec. 21, T. 5 N., R. 3 E., Fulton County. In addition to the type section, the Hulick Till is described in this report in the Chapin, Cottonwood School, Enion, Jubilee College, and Tindall School 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-b.jpg|{{file:94-tb_6-b.jpg}} 94-tb_6-c.jpg|{{file:94-tb_6-c.jpg}} 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-g.jpg|{{file:94-tb_6-g.jpg}} 94-tb_6-h.jpg|{{file:94-tb_6-h.jpg}} 94-tb_6-i.jpg|{{file:94-tb_6-i.jpg}} 94-tb_6-j.jpg|{{file:94-tb_6-j.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]

The Hulick Member overlies the Duncan Mills or Kellerville Members. It is bounded at the top by the Toulon, Radnor Till, or Berry Clay Members, the Teneriffe Silt, or Pearl Formation; locally, in the absence of these units, the Sangamon Soil is developed in the top of the member. The Hulick is in part stratigraphically equivalent to the Vandalia Till Member of south-central Illinois, but, as its composition is somewhat different and the equivalence of its boundaries has not been established, they are considered as separate members.

Extent and thickness[edit | edit source]

The member is locally over 100 feet thick in the Table Grove Moraine and in some deep bedrock valleys, but it more commonly is about 50 feet thick. The geographic distribution of the Hulick Till Member is shown in figure 6, and its spatial relations are indicated 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 member consists of till and intercalated sand and gravel outwash. The matrix grain size and clay mineral composition are given in tables 2 and 5, and the average of heavy mineral analyses is given 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-d.jpg|{{file:94-tb_5-d.jpg}} </gallery> |} </center>

Core(s)[edit | edit source]

Photograph(s)[edit | edit source]

Contacts[edit | edit source]

Well log characteristics[edit | edit source]

Fossils[edit | edit source]

Age and correlation[edit | edit source]

The Hulick Till Member is within the Monican Substage of the Illinoian Stage. The till was deposited by a glacier of the Lake Michigan Lobe.

Environments of deposition[edit | edit source]

Economic importance[edit | edit source]

Remarks[edit | edit source]

Reference(s)[edit | edit source]

place a <pre><br></pre>at the end of a line to get a line return WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois Geological Survey Bulletin 82, 233p.

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