Quail unit of Weber and others (1992)

Unit symbol: Dq
Age range Upper Devonian (382.7 to 358.9 Ma)
Lithology: Metamorphic
Group name: Clastic and carbonate rocks of the Yukon Flats Basin
Gray and green phyllite interlaminated with calcareous siltstone, quartzose sandstone, graywacke, and granule- to boulder conglomerate exposed in the Livengood quadrangle was described as the Quail unit by Weber and others (1992). Clasts in conglomerate include chert, dolostone, serpentinite, intermediate and mafic igneous rocks, quartzite, argillite, phyllite, slate, volcanic rocks, sandstone, and white quartz. At base are localized carbonate buildups of coral-bearing lime mudstone and wackestone of Late Devonian (Frasnian) age (Weber and others, 1992). Unit also includes light- and medium-gray to silvery gray phyllite, slate, siliceous siltstone, and argillite and also includes some thin limestone and calcareous siltstone (Chapman and others, 1975; Wilson and others, 1998). The Quail unit is slightly higher in metamorphic grade than the age and lithologically similar Cascaden Ridge unit of Weber and others (1992), mapped here as part of unit Dcr. Weber and others (1992) correlated the Quail unit with the Nation River Formation (Dnr) of the Charley River quadrangle (Brabb and Churkin, 1969); they believed it to be offset from the Nation River area by the Tinitna Fault System. However, the Quail unit and the Nation River Formation are somewhat different lithologically and in metamorphic grade, though they do correlate in age (R.B. Blodgett, oral commun., 2012)

Source map information

Source map Weber, F.R., 1997, Unpublished data.
Symbol Dps
Unit name Phyllite, slate, silicious siltstone, and argillite
Description Light and medium gray to silvery gray phyllite, slate, silicious siltstone and argillite; alters to hornfels near granitic contacts. Includes some thin limestone and calcareous siltstone.
Lithology Metamorphic

Correlated geologic units

Label Dp
Description Quail unit, conglomerate, phyllite, calc-phyllite, siltstone, and sandstone, Late Devonian(?)
Geologic age Late-Devonian
Geologic setting Sedimentary, slope-and-deep-water
Lithology Form Importance
Phyllite < Metaclastic < Metasedimentary < Metamorphic Major
Argillite < Metaclastic < Metasedimentary < Metamorphic Indeterminate, major
Slate < Metaclastic < Metasedimentary < Metamorphic Indeterminate, major