Geologic units in Chambers county, Alabama

Dadeville Complex; Rock Mills Granite Gneiss (Precambrian to Paleozoic) at surface, covers 23 % of this area

Coarse to medium-grained biotite granite gneiss; locally includes thick bands of epidote and thin, small amphibolite bodies. Boundary between Rock Mills Granite Gneiss and Camp Hill Granite Gneiss arbitrarily defined.

Dadeville Complex; Ropes Creek Amphibolite (Precambrian to Paleozoic) at surface, covers 22 % of this area

Layered and massive amphibolite; locally includes hornblende migmatite and ultramafic pods.

Dadeville Complex; Waverly Gneiss (Precambrian to Paleozoic) at surface, covers 18 % of this area

Feldspathic biotite-hornblende gneiss with thin layers of amphibolite, calc-silicate rock, garnet quartzite, and muscovite schist; locally rich in manganese.

Dadeville Complex; Camp Hill Granite Gneiss (Precambrian to Paleozoic) at surface, covers 15 % of this area

Camp Hill Granite Gneiss - coarse to medium-grained foliated granite to quartz diorite (tonalite) gneiss, locally biotite-rich; locally contains thin amphibolite pods and lenses. Boundary between Rock Mills Granite Gneiss and Camp Hill Granite Gneiss arbitrarily defined.

Dadeville Complex; Waresville Schist (Precambrian to Paleozoic) at surface, covers 10 % of this area

Banded amphibolite interlayered with chlorite schist, chlorite amphibolite, chlorite-actinolite schist, chlorite +/- magnetite quartzite, and actinolite quartzite; may include small ultramafic pods.

Opelika Complex; Auburn Gneiss (Precambrian to Paleozoic) at surface, covers 3 % of this area

Fine-grained biotite-oligoclase gneiss intermixed with coarse-grained muscovite-biotite schist; locally contains muscovite-rich pegmatite.

Dadeville Complex; Agricola Schist (Precambrian to Paleozoic) at surface, covers 2 % of this area

Agricola Schist - biotiite +/- garnet +/- sillimanite-feldspar-quartz schist, interlayered with thin-bedded dark-brown hornblende amphibolite; contains pegmatite pods and veins.

Opelika Complex; Bottle Granite (Precambrian to Paleozoic) at surface, covers 2 % of this area

Leucocratic, fine to medium-grained, well-foliated quartz monzonite to granite; locally porphyritic.

Opelika Complex; Loachapoka Schist (Precambrian to Paleozoic) at surface, covers 1 % of this area

Muscovite-quartz schist; locally contains biotite-garnet-muscovite schist, many layers conatin sillimanite (northeast of Mount Jefferson, Lee County); kyanite (west of Mount Jefferson); locally muscovite-rich schist and quartzite common.

Jacksons Gap Group; Jacksons Gap Group undifferentiated in part (Precambrian to Paleozoic) at surface, covers 1 % of this area

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.

Emuckfaw Group; Emuckfaw Group undifferentiated in part (Precambrian to Paleozoic) at surface, covers 1 % of this area

Interbedded muscovite +/- garnet-biotite schist, metagraywacke, calc-silicate rock, and quartzite; rare thin amphibolite. Includes thin layers of aluminous graphitic schist. Locally sheared to mylonite schist.

Dadeville Complex; Mafic and ultramafic rock (Precambrian to Paleozoic) at surface, covers 1 % of this area

Ultramafic rock including enstatite pyroxenite, layered actinolite-tremolite amphibolite altered locally to serpentine, anthophyllite, and talc; metanorite; metagabbro; hornblendite; garnet-hornblendite, and massive amphibolite.

Mylonitic and Cataclastic Rocks in the Brevard, Towaliga, and Goat Rock Fault Zones (Precambrian to Paleozoic) at surface, covers 0.2 % of this area

Mylonite and blastomylonite; contains minor ultramylonite, mylonite schist, and mylonite gneiss.

Opelika Complex; Auburn Gneiss, Unnamed unit (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Unnamed unit comprised of masses of medium- to coarse-grained muscovite-biotite schist, locally garnetiferous; grades into oa.

Jacksons Gap Group; Tallassee Metaquartzite (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Medium to fine-grained, massive to thin-bedded quartzite and metaconglomerate and thin beds of graphitic quartz schist, locally contains small garnets.

Wedowee Group; Cornhouse Schist (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Medium to coarse-grained multiply foliated +/- plagioclase +/- garnet-biotite-muscovite-quartz schist interlayed with chlorite-biotite-garnet schist, typically mylonitic.

Zana Granite (Precambrian to Paleozoic) at surface, covers < 0.1 % of this area

Quartz monzonite to granite with strong gneissic texture, cut by small pegmatites and aplite dikes, generally elongate; semiconcordant to foliation of country rock.

Granite Gneiss/ Granite (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area

Granite Gneiss/ Granite