Hulick Till Member

Lithostratigraphy: Glasford Formation >>Hulick Till Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series

Primary source

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

Contributing author(s)

H. B. Willman and John C. Frye

Name

Original description

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

Derivation

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

Other names

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

Type section

Type location

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).

Table 6 -- Stratigraphic Sections (partial)

• 
  Chapin Section and Cottonwood School Section
• 
  Cottonwood School Section (cont.) and Enion Section
• 
  Enion Section (cont.), Farm Creek Section, and Flat Rock Section
• 
  Flat Rock Section (cont.), Gale Section, and Jubilee College Section
• 
  Jubilee College Section (cont.), Lewistown Section, and Malden South Section
• 
  Malden South Section (cont.), New Salem Northeast Section, and Petersburg Section
• 
  Pleasant Grove School Section
• 
  Pulleys Mill Section, Rochester Section, and Tindall School Section
• 
  Tindall School Section (cont.) and Toulon Section

Stratigraphic relationships

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

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.

• 
  Fig. 6 -- Areal distribution of the dominantly till formations and members of Illinois.
• 
  Fig. 7 -- Diagrammatic cross section showing the relations of formations and members of Illinoian age in western Illinois.

Lithology

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.

• 
  Table 2 -- Typical Compositions of Glacial Till Units.
• 
  Table 4 -- Averages of Analyses of Selected Heavy and Light Minerals (Analyses of size fraction 0.062-0.250 mm). (From Frye, Glass, and Willman, 1962; Frye, Willman, and Glass, 1964; Willman, Glass, and Frye, 1963).

Selected analyses from stratigraphic sections

• 
  Table 5 -- Continued.

Age and correlation

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.

References

WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois Geological Survey Bulletin 82, 233p.

ISGS Codes

ISGS Code and Symbol

Stratigraphic Code	Geo Unit Designation
0900	g-vh