National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Cardens Bluff shale member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
    • Appalachian basin

King, P.B., and Ferguson, H.W., 1960, Geology of northeasternmost Tennessee, with a section on the description of the basement rocks by Warren Hamilton: U.S. Geological Survey Professional Paper, 311, 136 p., Prepared in cooperation with Tennessee Div. Geol [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp311]


Named for Cardens Bluff on Watauga River below Watauga Dam, Carter Co., northeastern TN. Named as a member of Hampton formation and is its basal shale. Occurs along crest of Iron Mountains and forms well-defined strike valley that continues northeastward as far as US Hwy 21 between Shady Valley and Mountain City. Occurs in Johnson and parts of Sullivan and Carter Cos., TN, and in small areas of Ashe, Watauga, and Avery Cos., NC. Pinches out northeastward or passes into interbedded sandstone and shale. Consists of clay shale that is darker than rest of Hampton; weathers into bright-orange, rusty chips. In gorges of Doe and Watauga Rivers through Iron Mountains, bedding is crossed by well-marked slaty cleavage. Thickness is 100 to 200 ft. Age is Early Cambrian.

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

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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).