Marble, northern Alaska

Unit symbol: Pzcn
Age range early Paleozoic (541 to 323.2 Ma)
Lithology: Metamorphic
Group name: Marble
Ranges from light-gray to white, partly recrystallized limestone to coarsely crystalline marble to dark, finely crystalline dolomitic marble. Subordinate interbedded calc-schist, chloritic schist, and quartzite. Unit ranges in age from Ordovician to Mississippian and may locally include rocks as old as Cambrian. Contains scattered fossils (Patton and others, 2009). Primarily exposed in the Baird Mountains quadrangle

Source map information

Source map Patton, W.W., Jr., Wilson, F.H., Labay, K.A., and Shew, Nora, 2009, Geologic map of the Yukon-Koyukuk basin, Alaska: U.S. Geological Survey Scientific Investigations Map SIM-2909, 26 p., 2 sheets, scale 1:500,000.
Symbol Pzca
Unit name Carbonate rocks
Description Ranges from light gray to white partly recrystallized limestone to coarsely crystalline marble. Dark finely crystalline dolomitic marble. Interbedded calc schist, chloritic schist, and quartzite in subordinate amounts. Unit ranges in age from Ordovician to Mississippian and may locally include rocks as old as Cambrian. Distributed along northern edge of map area from Baird Mountains and Selawik quadrangle on the west to Wiseman quadrangle on the east. Occurs as scattered bodies within schistose and phyllitic rocks of units PzPxsa, PzPxua, and Pzpa and as tectonic blocks in the mélange unit KJm
Lithology Sedimentary

Correlated geologic units

Label Dm
Description Marble, northern Alaska, Paleozoic
Geologic age Cambrian to Mississippian
Geologic setting Sedimentary, carbonate
Lithology Form Importance
Marble < Metacarbonate < Metasedimentary < Metamorphic Major
Limestone < Carbonate < Sedimentary Bed Major
Mica-schist < Schist < Metamorphic Indeterminate, major
Dolostone < Carbonate < Sedimentary Bed Indeterminate, major
Phyllite < Metaclastic < Metasedimentary < Metamorphic Minor