Heterogeneous mix of finely laminated, mostly mylonitic lithologies derived, in part, from adjacent units exposed in the eastern Wiseman and western Chandalar quadrangles. Unit is recessive, poorly exposed, and includes large (up to 0.5 km across) bodies of black quartzite and smaller exposures of quartz-rich schist, metagabbro, dark-brown marble, and relatively undeformed metasandstone and metasiltstone (Moore and others, 1997b; A.B. Till, unpub. data). In thin section, minerals are strained and broken. Protolith rocks may range in age from Proterozoic to Paleozoic; no age control is available. Age of unit is based on likely age of tectonic event that created the shear zone, which encompasses a zone of deformation between the Schist belt and Central belt of Till and others (2008a). Equivalent to the Hammond River phyllonite of Moore and others (1997b); westernmost extent of the unit is approximately located