Historical:Markham Silt Member

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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: Roxana Silt >>Markham Silt Member
Chronostratigraphy: Cenozoic Erathem >>Quaternary System >>Pleistocene Series

Authors

H. B. Willman and John C. Frye

Name origin

The Markham Silt Member is named for Markham, a village on the Norfolk and Western Railroad 4 miles west of Jacksonville, Morgan County.

Other names

The Markham Member previously was called Roxana Zone la (Frye and Willman, 1963b). It is the same as "upper story Sangamon" in recent Iowa literature (Ruhe et al., 1968).

Type section

Its type section is the Chapin Section (table 6) in roadcuts along Illinois Highway 104, 1.5 miles northwest of Markham, on the west side of Mauvaise Terre Creek, SW NE NW Sec. 8, T. 15 N., R. 11 W.

Table 6 -- Stratigraphic Sections (partial)
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.

Stratigraphic relationships

Its spatial relations are shown in figure 8.

Lithology

In many places the Markham is a colluvium of silt and some sand with small pebbles, and locally it is entirely within the A-zone and B-zone of the Chapin Soil. Along the Illinois River Valley it commonly contains some loess admixed with the colluvium, and so has a mineral composition different from that of the underlying Sangamon Soil (Frye, Glass, and Willman, 1962; Glass, in Frye and Willman, 1965b), but along the Mississippi River Valley its mineral composition is commonly indistinguishable from that of the underlying Sangamon Soil B-zone. Other stratigraphic sections with this report describing the Markham Member are the Campbells Hump, Cottonwood School, Gale, Jubilee College, and Tindall School Sections (table 6). Its mineral composition is given in table 5.

Table 6 -- Stratigraphic Sections (partial)
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.

Age and correlation

The Markham Member is in the earliest part of the Altonian Substage of the Wisconsinan Stage.

References

FRYE, J. C, H. D. GLASS, and H. B. WILLMAN, 1962, Stratigraphy and mineralogy of the Wisconsinan loesses of Illinois: Illinois State Geological Survey Circular 334, 55 p.
FRYE, J. C, and H. B. WILLMAN, 1963b, Loess stratigraphy, Wisconsinan classification and accretion-gleys in central western Illinois: Midwestern Section Friends of the Pleistocene, 14th Annual Meeting, Illinois State Geological Survey Guidebook Series 5, 37 p.
FRYE, J. C, and H. B. WILLMAN, 1965b, Illinois, in Guidebook for field conference G— Great Lakes- Ohio River Valley (R. F. Black and E. C. Reed [organizers]; C. B. Schultz and H. T. U. Smith [eds.]): International Association of Quaternary Research 7th Congress, Nebraska Academy of Science, p. 5-26; Illinois State Geological Survey Reprint 1966-B (supplemental data, H. D. Glass, p. G-S1 - G-S4), 26 p.
RUHE, R. V. (et al.), W. P. DIETZ, T. E. FENTON, and G. F. HALL, 1968, Iowan drift problem, northeastern Iowa: Iowa Geological Survey Report of Investigations 7, 40 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
0710
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