Dutchtown Limestone

From ILSTRAT
Jump to: navigation, search

Lithostratigraphy: Ottawa Limestone Megagroup >>Ancell Group >>Dutchtown Limestone
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Blackriveran Stage
Allostratigraphy: Tippecanoe Sequence

Primary source

Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

Contributing author(s)

H. B. Willman and T. C. Buschbach

Name

Original description

Dutchtown Limestone (McQueen, 1937, p. 12).

Derivation

Named for Dutchtown, Cape Girardeau County, Missouri.

Other names

History/background

Type section

Type location

The type section of the Dutchtown Limestone Formation is in a bluff 1 mile east of Dutchtown.

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Dutchtown Limestone overlies the St. Peter Sandstone and underlies the Joachim Dolomite in extreme southern Illinois (fig. O-18). It is differentiated into two members, the Gordonville below (largely dolomite) and the Sharpsboro above (largely limestone). It appears to grade laterally into the St. Peter Sandstone.

Extent and thickness

The Dutchtown Limestone is not exposed in Illinois, but it has been penetrated in wells as far north as southern Jackson County, thinning in that direction from a known thickness of about 150 feet in the Cape Girardeau area (fig. O-18). However, drilling near by in Kentucky suggests it is as much as 200 feet thick in southeastern Illinois (DuBois, 1945; Templeton and Willman, 1963).

Lithology

The Dutchtown is largely dark gray (nearly black), argillaceous, lithographic limestone and dolomite. When freshly broken it has a strongly fetid odor. It contains beds of gray and brown shaly limestone and dolomite, calcareous siltstone, and dolomitic sandstone. Its dark color and prevalence of limestone differentiates it from the overlying Joachim Dolomite.

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

The Dutchtown is fossiliferous, and mollusks, ostracodes, and conodonts are the most abundant fossils.

Age and correlation

The Dutchtown Limestone is correlated with similar dark limestone in the Murfreesboro Limestone in Tennessee and the Pamelia Limestone in New York.

Environments of deposition

Economic importance

Remarks

References

DUBOIS, E. P., 1945, I. Subsurface relations of the Maquoketa and "Trenton" Formations in Illinois: Illinois State Geological Survey Report of Investigations 105, p. 7-33.
MCQUEEN, H. S., 1937, Dutchtown, a new Lower Ordovician formation in southeastern Missouri: Missouri Geological Survey and Water Resources, 59th Biennial Report, 1935-1936, app. 1 , 27 p.
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation
8300
Oj