"Beaucoup" is an informal oil field name. It has been described in
COLLINSON, CHARLES, L. E. BECKER, G. W. JAMES, J. W. KOENIG, and D. H. SWANN, 1967a, Illinois Basin, in International symposium on the Devonian System: Alberta Society of Petroleum Geologists, v. 1, p. 940-962; Illinois State Geological Survey Reprint 1968-G.
- Unnamed Limestone Member of the Bailey Limestone
- Over most of the central and western parts of the Illinois basin a grey to white, pure non-cherty limestone 10 to 40 feet thick occurs at the top of the Bailey. Because the unit is distinctive and identifiable over a large area, we have indicated it on our cross sections and stratigraphic columns (Figs. 3 and 7). Swann believes it may be a northward extension of the Flat Gap Limestone of Tennessee. In Washington County, Illinois, where it is especially well developed, it has been referred to by the oil field term "Beaucoup."
- The unit is well exposed in Quarry Hill near Ozora, Ste. Genevieve County, Missouri, where it consists of 5 to 10 feet of heavily bedded grey-white encrinital limestone (Croneis, 1944).