Jacksons Gap Group; Jacksons Gap Group undifferentiated in part

Principally graphitic sericite (muscovite)-quartz schist; includes sericite-quartz phyllonite; sericite phyllonite, blastomylonite, porphyroclastic blastomylonite schist, and mylonite quartzite occur principally along margins in south and form most of unit northeast of Jacksons Gap, Tallapoosa County.
State Alabama
Name Jacksons Gap Group; Jacksons Gap Group undifferentiated in part
Geologic age Precambrian to Paleozoic
Lithologic constituents
Metamorphic > Schist > Mica-schist > Muscovite-schistprincipally graphitic sericite (muscovite)-quartz schist; includes porphyroclastic blastomylonite schist
Metamorphic > Metasedimentary > Metaclastic > Quartzitemylonite quartzite
Tectonite > Mylonite > Phylloniteincludes sericite-quartz phyllonite; sericite phyllonite, blastomylonite.
Comments part of Brevard Fault Zone. Printed map has units 'jg' and 'jgc' in one description; split them up here.

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.

NGMDB product
Counties Chambers - Elmore - Randolph - Tallapoosa