Wachsmuth Limestone

Unit symbol: Mlgw
Age range Mississippian (358.9 to 323.2 Ma)
Lithology: Sedimentary
Group name: Wahoo, Alapah, and Wachsmuth Limestones (Lisburne Group)
Bioclastic (crinoidal) limestone, dolostone and dolomitic limestone, black nodular chert; lower part contains abundant argillaceous and shaly limestone and minor shale. Differentiated only where mapped by Bowsher and Dutro (1957) in the Philip Smith Mountains quadrangle (Brosgé and others, 1979). The lower part of the Lisburne Group as mapped by Wartes and others (2011) is assigned to this unit in the Mount Michelson quadrangle. Type section about 375 m thick

Source map information

Source map Wartes, M.A., Wallace, W.K., Loveland, A.M., Gillis, R.J., Decker, P.L., Reifenstuhl, R.R., Delaney, P.R., LePain, D.L., and Carson, E.C., 2011, Geologic map of the Kavik River area, northeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigation 2011-3A, 14 p., 1 sheet, scale 1:63,360.
Symbol Mll
Unit name Ellesmerian Megasequence - LISBURNE GROUP, LOWER PART
Description Dark-gray-weathering limestone with common black nodular chert layers and lenses. Typically recessive and rubbly, but local outcrops display alternating thin, resistant, and recessive beds. Common solitary and colonial corals in dark lime–mud matrix. Corresponds approximately with lower Alapah Limestone and may include rocks assigned to the Wachsmuth Limestone by Brosgé and others (1962)
Lithology Sedimentary

Correlated geologic units

Label Mlw
Description Lisburne Group, Wachsmuth Formation (Mlw, PS002)
Geologic age Mississippian
Geologic setting Sedimentary, carbonate
Lithology Form Importance
Dolostone < Carbonate < Sedimentary Bed Major
Limestone < Carbonate < Sedimentary Bed Major
Chert < Chemical < Sedimentary Bed Minor
Shale < Mudstone < Clastic < Sedimentary Bed Minor