Cypress Formation

Age:

Mississippian

Type designation:

Type locality: The name "Cypress Sandstone" was first used by Engelmann (1863, p. 189-190) for massive sandstone exposures in the bluffs along Cypress Creek, Union County, Illinois (Burger, 1970; Gray, 1986).

History of usage:

Revised: As redescribed by Swann (1963, p. 35) and Atherton and others (1975, p. 155), the Cypress is a complex of sandstone bodies totaling 100 ft (30 m) or more in thickness (Gray, 1986).

Miscorrelation: Following usage established by Malott (1919), the name "Cypress Sandstone" was for many years incorrectly applied in Indiana to the somewhat younger unit now called the “Big Clifty Formation” (Burger, 1970; Gray, 1986). The Cypress Formation is equivalent to the Elwren Formation of Indiana outcrop terminology (Burger, 1970; Gray, 1986).

Description:

According to Puscas (1953) the Cypress Formation consists of white fine- to medium-grained sandstone, gray siltstone, and shale (Burger, 1970). It reaches a maximum thickness of 125 ft (38 m) (Gray, 1986).

Distribution: The Cypress extends from Parke and Owen Counties southwestward (Gray, 1986). According to Sullivan (1972, p. 20), the Cypress is recognizable in only about 40 percent of its potential area of distribution because over wide areas the underlying Reelsville Limestone is absent (Gray, 1986).

Boundaries:

The Cypress is underlain conformably by the Reelsville Limestone where the Reelsville is present. But, where that formation is absent, in and adjacent to an area called the "West Baden clastic belt," the position of the base of the Cypress cannot be determined because of the lithologic similarity of the Cypress to the underlying Sample Formation (Gray, 1986). The Cypress Formation is overlain conformably by the Beech Creek Limestone or disconformably by the Mansfield Formation (Morrowan) (Gray, 1986).

See also:

Elwren Formation

References:

Atherton, Elwood, Collinson, Charles, and Lineback, J. A., 1975, Mississippian System, in Willman, H. B., Atherton, Elwood, Buschbach, T. C., Collinson, Charles, Frye, J. C., Hopkins, M. E., Lineback, J. A., and Simon, J. A., Handbook of Illinois stratigraphy: Illinois State Geological Survey Bulletin 95, p. 123-163.

Burger, A. M., 1970, Cypress Formation, in Shaver, R. H., Burger, A. M., Gates, G. R., Gray, H. H., Hutchison, H. C., Keller, S. J., Patton, J. B., Rexroad, C. B., Smith, N. M., Wayne, W. J., and Wier, C. E., Compendium of rock-unit stratigraphy in Indiana: Indiana Geological Survey Bulletin 43, p. 41.

Engelmann, Henry, 1863, On the Lower Carboniferous System in northern Illinois: Academy of Science of St. Louis Transactions, v. 2, p. 188-190.

Gray, H. H., 1986, Cypress Formation, in Shaver, R. H., Ault, C. H., Burger, A. M., Carr, D. D., Droste, J. B., Eggert, D. L., Gray, H. H., Harper, Denver, Hasenmueller, N. R., Hasenmueller, W. A., Horowitz, A. S., Hutchison, H. C., Keith, B. D., Keller, S. J., Patton, J. B., Rexroad, C. B., and Wier, C. E., Compendium of Paleozoic rock-unit stratigraphy in Indiana–a revision: Indiana Geological Survey Bulletin 59, p. 33-34.

Hansen, W. R., 1991, Suggestions to authors of the reports of the United States Geological Survey (7^th ed.): Washington, D.C., U.S. Geological Survey, 289 p.

Malott, C. A., 1919, The "American Bottoms" region of eastern Greene County, Indiana–a type unit in southern Indiana physiography: Indiana University Studies, v. 6, no. 40, 61 p.

Puscas, George, 1953, The study of the Aux Vases Formation in the Monroe City oil field, Knox County, Indiana: Bloomington, Indiana University, master's thesis, 33 p.

Shaver, R. H., coordinator, 1984, Midwestern basin and arches region–correlation of stratigraphic units in North America (COSUNA): American Association of Petroleum Geologists Correlation Chart Series.

Sullivan, D. M., 1972, Subsurface stratigraphy of the West Baden Group in Indiana: Indiana Geological Survey Bulletin 47, 31 p.

Swann, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.