Unit symbol: | Pzarqm |
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Age range | Devonian or older (541 to 358.9 Ma) |
Lithology: | Metamorphic |
Group name: | Schist and phyllite of the Alaska Range |
Source map | Csejtey, Bela, Jr., Mullen, M.W., Cox, D.P., and Stricker, G.D., 1992, Geology and geochronology of the Healy quadrangle, south-central Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1961, 63 p., 2 sheets, scale 1:250,000. |
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Symbol | PzpCp |
Unit name | Pelitic and quartzose schist sequence [old, abandoned Birch Creek Schist] |
Description | Intercalated in various proportions: medium- to fine-grained, generally medium-gray quartz-sericite and (or) muscovite pelitic schist; fine- to medium-grained, medium-gray quartzite; quartz-sericite and (or) muscovite-calcite pelitic schist; fine-grained dark-gray to black carbonaceous schist or phyllite; a few interbeds, as much as several tens of meters thick of medium-gray, fine-to medium-grained massive marble; and a few small bodies and layers of chloritic schist. |
Lithology | Metamorphic |
Label | PzZaqs |
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Description | Pelitic and quartzose schist of the Alaska Range |
Geologic age | Paleozoic to Devonian |
Geologic setting | Sedimentary, undivided |
Lithology | Form | Importance |
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Pelitic-schist < Metaclastic < Metasedimentary < Metamorphic | Greenschist | Major |
Quartzite < Metaclastic < Metasedimentary < Metamorphic | Greenschist | Major |
Phyllite < Metaclastic < Metasedimentary < Metamorphic | Greenschist | Minor |