Wahoo Limestone

Unit symbol: IPlgw
Age range Middle and Lower Pennsylvanian and Upper Mississippian? (330.9 to 307 Ma)
Lithology: Sedimentary
Group name: Wahoo, Alapah, and Wachsmuth Limestones (Lisburne Group)
Consists of light-colored either coarse-grained or micritic limestone, informally divided into lower and upper members. Thickness ranges from as much as 415 m at type section to 0 m (Brosgé and others, 1962). Also includes oolitic and glauconitic limestone; weathers light-gray and cream colored (Reiser and others, 1971). Unit is uppermost part of the Lisburne Group in eastern Alaska and likely extends into the Yukon where the Lisburne Group adjacent to the Alaska-Yukon border is mapped as an undivided unit; elsewhere in the Yukon, equivalent rocks are mapped as the Ettrain Formation. A Late Mississippian age was reported by Armstrong and Mamet (1977), whereas Dutro (1987) suggested age was Pennsylvanian only

Source map information

Source map Reiser, H.N., Brosge, W.P., Dutro, J.T., Jr., and Detterman, R.L., 1971, Preliminary geologic map, Mt. Michelson quadrangle, Alaska: U.S. Geological Survey Open-File Report 71-237, 2 sheets, scale 1:200,000.
Symbol IPw
Unit name Wahoo Limestone
Description Fine-grained limestone; oolitic limestone; glauconitic limestone; weathers light gray and creamy.
Lithology Sedimentary

Correlated geologic units

Label IPlw
Description Lisburne Group, Wahoo Limestone, uppermost unit in eastern Alaska
Geologic age Early-Pennsylvanian to Middle-Pennsylvanian
Geologic setting Sedimentary, carbonate
Lithology Form Importance
Limestone < Carbonate < Sedimentary Bed Major