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 Brosge', W.P., Reiser, H.N., Dutro, J.T., Jr., and Detterman, R.L., 1979, Bedrock geologic map of the Phillip Smith Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-879-B, 2 sheets, scale 1:250,000.
Symbol Mlw
Unit name Wachsmuth Limestone
Description Bioclastic limestone, dolomite and dolomitic limestone, black nodular chert; in lower part much argillaceous and shaley limestone and minor shale. Differentiated only where mapped by Bowsher and Dutro near Itkillik Lake.
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