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Geologic Unit: Motts
Map showing publication footprint
  • Usage in publication:
    • Motts Gneiss
  • Modifications:
    • Named
  • Dominant lithology:
    • Gneiss
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Bentley, R.D. (editor), and Neathery, T.L. (editor), 1970, Geology of the Brevard fault zone and related rocks of the Inner Piedmont of Alabama: Alabama Geological Society Annual Field Trip Guidebook, December 4-5, 1970, no. 8, 119 p.


Summary:

Name credited to unpublished report on Lee Co., east-central AL, by Bentley. Probably named for community of Motts. Described as a 2-mi-wide band of leucocratic pencil gneiss with local linear masses of amphibolite. Mineralogically, it is a quartz-rich leucocratic quartz diorite; amphibolites have been recrystallized by cataclastic to epidote amphibolite. Most characteristic feature is its weathering product, a saprolite with spindly fragments. Nature of contacts and age not stated [probably early Paleozoic].

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Motts Gneiss
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Raymond, D.E., Osborne, W.E., Copeland, C.W., and Neathery, T.L., 1988, Alabama stratigraphy: Geological Survey of Alabama Circular, no. 140, 97 p.


Summary:

Type locality given as exposures near community of Motts, T18N, R29E, sec. 9, Lee Co., AL. Present along southeast edge of Goat Rock fault zone. Good exposures at Dunken and Little Uchee Creeks; typical exposures occur along Shotwell-Meadows Crossroads road. Amphibolite mylonite is best exposed below dam on Little Uchee Creek at site of old Moffits Mill. Report includes correlation chart.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Motts Gneiss*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Steltenpohl, M.G., and Kunk, M.J., 1993, 40Ar/39Ar thermochronology and Alleghanian development of the southernmost Appalachian Piedmont, Alabama and southwest Georgia: Geological Society of America Bulletin, v. 105, no. 6, p. 819-833.


Summary:

Authors follow usage of Bentley and Neathery (1970) who subdivided the Uchee belt into Motts Gneiss, Uchee Complex, and Moffits Mill Complex (revised as Moffits Mill Schist by Thompson and Neathery, 1980). Report includes geologic map.

Source: GNU records (USGS DDS-6; Reston GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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